Welcome to a whirlwind tour of ten mind‑bending experiments where the power of belief outshone actual medicine. In each case, the phenomenon known as the placebo effect managed to convince both patients and scientists that something real was happening, even when the treatment was nothing more than a clever ruse. Buckle up, because these 10 times placebo fooled modern science are as astonishing as they are entertaining.

10 Times Placebo: The Mind’s Sneaky Power

10 The Sham Knee Surgery

Back in 2002, orthopedic surgeon Bruce Moseley set out to test the limits of surgical belief. He recruited volunteers suffering from severe knee osteoarthritis and split them into two groups: one received a conventional knee‑replacement operation, while the other underwent an entirely fabricated procedure. Those in the sham group were sedated, given three tiny incisions that mimicked the real surgery, and then sent home with the same post‑op instructions.

To sell the illusion, the operating room staff performed a full‑blown script—splashing saline to imitate joint lavage, playing recorded sounds of drills and saws, and even pretending to stitch up the incisions. The patients, still under anesthesia, never suspected that their knees had not been repaired at all.

When the dust settled, the outcomes were jaw‑dropping. The sham‑surgery participants reported pain relief that rivaled the genuine surgery cohort. Some even found themselves walking up stairs more easily years later. The findings sent shockwaves through orthopedics, prompting surgeons to rethink how much of the benefit they attributed to the knife itself might actually stem from patient expectation.

9 The Poison Ivy Blindfold Test

In a widely cited 1962 experiment conducted in Japan, researchers zeroed in on children who were hypersensitive to the lacquer‑tree leaf—a plant that provokes a rash reminiscent of poison ivy. The scientists blindfolded the youngsters and told them that one arm would be rubbed with the toxic leaf while the other would receive a harmless plant. In reality, they swapped the treatments, applying the benign leaf to the arm labeled “dangerous.”

Within a few hours, a striking number of children developed visible irritation on the arm that had only encountered the harmless leaf. Their expectation of exposure seemed to trigger a genuine physiological response, manifesting as a rash.

Even more intriguing, the arm that was actually brushed with the toxic leaf showed little to no reaction in many participants. Because they believed the leaf was harmless, their bodies appeared to down‑regulate the expected immune response. Although some details of the study remain debated, it stands as a classic illustration of how belief can shape physical outcomes.

8 The Incredible Case of Mr. Wright

During the 1950s, a patient recorded in medical literature as Mr. Wright was battling advanced lymph‑node cancer with tumors spreading throughout his body. Desperate for a cure, he latched onto a new experimental drug called Krebiozen, convinced it was his ticket to recovery.

After receiving the drug, Mr. Wright’s condition seemed to turn around dramatically—tumors shrank, pain lessened, and he regained enough mobility to move about more comfortably. However, when he later read reports suggesting Krebiozen was ineffective, his health deteriorated once again.

In an attempt to rekindle his optimism, his physician administered an inert injection presented as a refined version of the drug. The patient experienced a temporary resurgence of improvement, only to slump again when negative information resurfaced. While the anecdote is largely anecdotal and should be interpreted cautiously, it underscores the striking influence that belief can exert on perceived health outcomes.

7 The Fake Alcohol Parties

Psychologists have staged bar‑like settings where participants are served cocktails they are told contain alcohol, yet the drinks are completely non‑alcoholic. The concoctions are crafted from mixers such as tonic water and fruit juice, sometimes with a splash of liquor on the rim to lend a convincing aroma.

Almost immediately, many participants begin to exhibit classic signs of intoxication—raising their voices, shedding inhibitions, and even wobbling as if they’d had a few drinks. The social context and the belief that they’re drinking alcohol appear to drive these behavioral changes.

When researchers finally reveal that the beverages were alcohol‑free, reactions range from surprise to skepticism. Yet, even after the truth is disclosed, some individuals still perform poorly on coordination tasks, highlighting how powerful expectation and environment are in shaping behavior traditionally attributed to alcohol.

6 The Color‑Coded Sedatives

Pharmaceutical researchers have long known that the visual appearance of a pill can sway a patient’s perception of its effectiveness. In several studies, individuals suffering from anxiety or insomnia were given inert tablets dyed in various colors to see whether hue alone could influence their experience.

Participants who received blue pills frequently reported feeling calmer and more relaxed—blue being culturally linked to tranquility. Conversely, those who took red or yellow tablets were more likely to describe sensations of stimulation or heightened alertness.These color‑based expectations are so strong that drug manufacturers often factor pill hue into their design process, aligning visual cues with the intended therapeutic effect. Although the color does not alter the chemical composition, it undeniably shapes how patients interpret the medication’s impact.

5 Open‑Label Placebos

For decades, the prevailing belief was that a placebo only works when the patient thinks they’re receiving an active drug. The 2010s brought a twist on this notion through a series of trials involving open‑label placebos—pills that were openly declared to contain no active ingredients.

Doctors explained that merely taking a pill can trigger a healing response, even if the pill itself is inert. Astonishingly, patients dealing with chronic back pain, irritable bowel syndrome, and depression reported noticeable symptom relief despite being fully aware of the placebo nature of the treatment.

This phenomenon suggests that the ritual of medication—visiting a clinician, receiving a prescription, and adhering to a dosing schedule—can condition the brain to produce therapeutic effects. The discovery has opened doors to ethically harnessing placebo power without deception.

4 The Mammary Artery Ligation

In 1959, cardiologist Leonard Cobb examined a popular surgical technique for severe angina that involved tying off the internal mammary arteries to boost heart blood flow. While many patients reported relief, Cobb wondered whether the improvement stemmed from the operation itself or from patient expectations.

He designed a study where some participants underwent the full artery‑ligation surgery, while others received a sham operation—small incisions were made, but the arteries were left untouched. Neither the patients nor the evaluating physicians knew which procedure had been performed.

The outcomes were striking: there was no significant difference in symptom relief between the real‑surgery group and the sham‑surgery cohort. The sham patients reported improvements comparable to those who had the actual operation, leading the medical community to largely abandon the procedure and highlighting the potent role of expectation in perceived recovery.

3 Placebo Sleep Performance

In a 2014 investigation, scientists probed whether beliefs about sleep quality could sway cognitive performance. Participants were hooked up to devices described as measuring brainwave activity and REM cycles, though the equipment actually performed no real assessment.

Researchers then fed fabricated feedback: some participants were told they’d enjoyed excellent sleep, while others were informed their rest had been poor. Afterwards, everyone tackled a battery of memory and attention tasks designed to gauge cognitive function.Those who believed they’d slept well consistently outperformed their peers on the tests, even when their actual sleep was far from restorative. Conversely, participants convinced they’d had a bad night tended to perform worse. The study underscores how expectations about rest can manifest as measurable differences in mental performance.

2 Parkinson’s Sham Brain Surgery

Parkinson’s disease, a neurodegenerative disorder marked by diminished dopamine levels, prompted researchers in the late 1990s to experiment with transplanting dopamine‑producing cells into patients’ brains. To rigorously assess the procedure’s efficacy, a subset of participants underwent a sham surgery.

During the sham operation, surgeons performed steps such as drilling tiny holes in the skull but deliberately omitted the implantation of any cells. The patients remained blind to whether they received the actual transplant or the placebo surgery.

Surprisingly, several individuals in the placebo group displayed noticeable improvements in motor function during follow‑up evaluations. These findings suggested that the mere expectation of a cutting‑edge treatment could influence how symptoms are experienced or reported, emphasizing the necessity of tightly controlled trials for surgical interventions.

1 Placebo Morphine Conditioning

One of the most striking demonstrations of the placebo effect involves pharmacological conditioning. After surgery, patients are often administered morphine for pain relief, and over time their bodies learn to associate the injection with analgesia.

In certain studies, researchers swapped the morphine with a saline solution without informing the patients. Remarkably, the participants still reported significant pain reduction. Brain imaging indicated that the expectation of receiving morphine activated internal pain‑control pathways.

Further experiments revealed that when patients were given a drug that blocks endorphins, the placebo‑induced pain relief vanished. This suggests the brain was releasing its own natural opioids in response to belief, demonstrating that the placebo effect can involve concrete biochemical changes, not merely psychological tricks.

Welcome to a whirlwind tour of 10 crazy facts that make the placebo effect one of the most fascinating, baffling, and downright mind‑blowing phenomena in modern science. From dogs that get better on sugar pills to surgeries that never actually happen, each fact shows just how powerful our expectations can be when it comes to healing. Buckle up, because we’re about to explore the weird, wonderful, and sometimes wicked ways our brains can trick our bodies into feeling better.

1 10 Crazy Facts About Placebo In Dogs

Even our four‑legged friends aren’t immune to the mind‑over‑matter magic of placebos. In a double‑blind study involving epileptic dogs, researchers split the pups into two groups: one received the actual anti‑seizure medication, the other got an inert sugar pill. Astonishingly, the placebo‑treated dogs displayed a marked improvement in seizure frequency, proving that the expectation of treatment can cross species lines. The phenomenon isn’t limited to canines; Siberian hamsters, when led to believe winter has arrived, throttle down their immune defenses to conserve energy, mirroring a placebo‑like response. These findings suggest that an external cue—whether a pill, a scent, or a seasonal cue—can activate a cascade of physiological changes, even in animals that can’t consciously “think” they’re being treated.

2 Antidepressants Are Basically A Total Sham

Depression is a heavy burden, and for years physicians have handed out antidepressants like Halloween candy. Yet a growing body of high‑profile research shows that the therapeutic benefit of many of these drugs is indistinguishable from that of a placebo. In large, double‑blind trials, patients receiving sugar pills reported the same lift in mood as those on active medication, but without the dreaded side‑effects. Big‑pharma firms, understandably, have been quick to downplay these results, fearing billions in lost revenue. For sufferers, however, the implication is profound: the brain’s own chemistry can be nudged back into balance simply by believing a treatment works, opening the door to non‑pharmacological pathways for mental health recovery.

3 You Can Placebo Yourself Into Inebriation

Ever heard the joke that women get tipsy on less booze? Science now shows there’s a grain of truth rooted in expectation. In a clever experiment, participants were handed what they believed was vodka, but was actually tonic water with a lime wedge. Even though no alcohol was consumed, the volunteers reported impaired judgment, slower reaction times, and a measurable dip in IQ scores. The effect even made headlines when a college “kegger” served non‑alcoholic beer; students behaved as if they were drunk, laughing and stumbling, all because their minds were convinced they’d had alcohol. It turns out that the mere belief of intoxication is enough to alter cognition and motor performance.

4 Where You Live Affects Placebo

Culture is a silent puppeteer pulling the strings of the placebo response. Americans, bombarded by glossy drug ads, tend to trust injections more than pills, perhaps because needles feel more “medical.” Europeans, on the other hand, show a stronger response to oral tablets. In one ulcer trial, German participants experienced a larger reduction in symptoms from a placebo pill than their Brazilian counterparts, while a hypertension study found the opposite pattern—German patients were the least responsive to pill placebos. These geographic quirks illustrate how societal conditioning, media exposure, and even the way we’re taught to view medicine shape the magnitude of our brain‑driven healing.

5 Placebo Still Works Even Though You Know It’s A Placebo

One would think that the magic disappears once patients discover their “medicine” is nothing but sugar. Surprisingly, the effect often persists. In several clinical trials, participants were openly told they were receiving a sham drug, yet many continued to report pain relief, mood improvement, and other benefits. Some even chose to stay on the placebo because the perceived gains outweighed any disappointment. This paradox hints at a deeper truth: once the brain has been primed to expect relief, the physiological pathways stay active, even in the face of transparent deception. In the future, doctors might deliberately prescribe openly labeled placebos to harness this enduring power.

6 Placebo Through Infections

In a bold experiment, researchers infected asthma patients with hookworms, a parasite known to modulate the immune system. One group received live worms, while a second group was told they had been infected with the same parasite, though they received a harmless placebo. Both cohorts showed significant improvement in asthma symptoms, and many participants elected to keep the real worms after the trial ended, believing the parasites were helping them breathe easier. The study underscores that the mere belief of being treated—whether by a living organism or a fake one—can trigger powerful immunological changes.

7 Placebo Has An Evil Twin Named “Nocebo”

Just as optimism can summon healing, pessimism can summon suffering—a phenomenon known as the nocebo effect. When patients expect side‑effects, they often experience them, even if the treatment is inert. In Italy, participants who believed they were drinking milk containing lactose reported stomach cramps, despite receiving lactose‑free milk; 44 % of lactose‑intolerant subjects and 26 % of tolerant subjects felt discomfort. Another study showed men warned about possible erectile dysfunction from finasteride reported the issue at a rate three times higher than those not warned. Even a suicide‑attempt participant who swallowed dozens of placebo pills saw a dangerous drop in blood pressure. These examples illustrate how negative expectations can manifest as real physiological distress.

8 The Color Placebo Pill You Take Affects How Well It Works

Our brains are wired to read visual cues, and even the hue of a pill can steer therapeutic outcomes. Researchers discovered that yellow tablets produce the strongest antidepressant effect, while red ones boost alertness. Green pills calm anxiety, and white tablets soothe ulcer pain. Moreover, the more frequently a placebo is taken, the greater its impact—four doses a day outperform two. Branding matters too: a pill stamped with a recognizable name outperforms a generic blank tablet. These findings reveal that superficial aesthetics can tip the scales of healing, nudging our subconscious into believing a drug is more potent.

9 Placebo Surgeries Are Also Effective In Curing Injuries, Somehow

Imagine undergoing an operation, waking up, and learning the surgeon never actually repaired anything—yet the pain is gone. That’s the reality of sham surgery trials. Participants receive incisions, anesthesia, and the full theater of an operation, but no therapeutic procedure follows. Despite the deception, many report pain relief comparable to those who received real surgery, suggesting that the ritual, the care, and the belief that something was done are enough to activate healing pathways. From a cost perspective, placebo surgeries are dramatically cheaper, yet they raise profound ethical questions about the power of expectation in surgical recovery.

10 Placebo Effect Has Become More Powerful Over The Years

The placebo’s influence has been growing like a cultural tide. First documented in the late 1700s, it entered scientific consciousness in the 1970s, and since then, each new wave of medical advancement has amplified its potency. As societies place increasing trust in doctors, hospitals, and pharmaceuticals, the expectation that a prescribed treatment will work intensifies, reinforcing the placebo response. Modern patients follow a familiar script: visit the doctor, get a diagnosis, receive a prescription, and take the pill—all rituals that reinforce belief in healing. This social conditioning, combined with ever‑improving medical technology, suggests the placebo effect will continue to swell, echoing our collective faith in science itself.

Welcome to a whirlwind tour of 10 mind blowing demonstrations of the placebo effect, where the brain’s expectations rewrite the script of our bodies. From pretentious bottled water to surgeries that never really happened, each case shows how belief alone can twist taste, pain, and even the immune system. Buckle up, because your mind is about to pull some serious rabbit‑tricks.

10 Mind Blowing Placebo Wonders

10 Elegant Water or Tap Water

Imagine strolling into a swanky California eatery where, instead of a wine list, the sommelier presents a catalog of premium waters priced between four and eight dollars a bottle. One standout is the whimsically named L’eau Du Robinet – literally “tap water” in French. Marketed as a mineral‑rich, brashly flavorful elixir, it’s billed as the perfect companion to meat and poultry dishes.

The twist? This “gourmet” water was featured on Penn and Teller’s show BS, yet every bottle was drawn from the same garden hose behind the restaurant. Patrons, none the wiser, praised its crispness and claimed it tasted cleaner than ordinary tap water. If a garden‑hose stream can masquerade as a $8 luxury, perhaps the next time you reach for a pricey bottled label you’ll pause and wonder what your brain is actually sipping.

9 Exercising without Exercise

Harvard psychologists ran a clever experiment with hotel housekeeping staff. One group was told that the routine chores they performed each day – making beds, vacuuming, and the like – counted as “exercise,” while a control group received no such briefing. The twist: the work was not a structured workout at all.

After just a month, the “exercise‑informed” maids displayed measurable health gains: systolic blood pressure dropped, body weight fell, BMI decreased, and waist‑to‑hip ratios shrank. On average, their blood pressure fell about ten percent. The findings suggest that the brain’s belief in being active can trigger real physiological shifts, though it’s no invitation to lounge on the couch and expect similar results.

8 Surgery Pain, but without an Operation

A 2002 trial published in the New England Journal of Medicine enlisted 180 knee‑osteoarthritis sufferers, randomly assigning them to three arms: actual surgery, arthroscopic cleaning, or a sham procedure. In the placebo arm, surgeons made three tiny skin incisions and splashed saline, creating the illusion of a real operation without any therapeutic intervention.

Patients were blinded to their group assignment, yet the placebo cohort reported markedly less pain than those who underwent genuine surgery. Astonishingly, these pain‑relief benefits persisted for two years, matching or even surpassing the outcomes of the invasive procedures. Financially, the sham operation cost a fraction of the $5,000 typical surgery bill, underscoring how expectation alone can rival costly medical interventions.

7 Placebos: Better Than the Real Treatment

Back‑pain researchers led by Ted Kaptchuk at NPR investigated whether openly administered placebos could outperform standard analgesics. Participants with chronic lower‑back discomfort were split: half received an inert pill and were told it was a placebo; the other half got a conventional treatment.Even with full knowledge they were ingesting a sugar pill, the placebo group reported a 30% drop in pain, compared with just 9% in the control group. Moreover, daily‑activity difficulty shrank by 29% for the placebo cohort, while the control saw no change. The study hints that honest deception—telling patients they’re getting a placebo—might still harness the brain’s self‑healing circuitry, potentially saving patients thousands in medication costs.

6 Placebos: Thomas Jefferson Approved

Historical records reveal that even Founding Father Thomas Jefferson recognized the power of inert remedies. In an 1807 letter to physician Caspar Wistar, Jefferson described a doctor who relied heavily on “bread pills, drops of colored water, and powders of hickory ashes” more than on any active drug.

This anecdote shows that the practice of prescribing placebos stretches back over two centuries, confirming that the mind‑body connection has long fascinated physicians, even in the early days of American medicine.

5 Overdosed on Placebo

A tragic twist on the placebo phenomenon emerged in 2012 when a participant in an antidepressant trial swallowed all 26 pills from his prescription bottle in a suicide attempt. He experienced severe respiratory distress, plummeting blood pressure, and near‑death symptoms.

Doctors initially suspected toxic overdose, but later discovered the “medication” was actually a batch of sugar pills that had successfully lifted his mood. The powerful belief that he’d taken a potent antidepressant triggered a severe nocebo reaction, driving his body toward a crisis. Once clinicians clarified that the pills were inert, his vitals normalized, illustrating how the brain can both heal and harm based on expectation alone.

4 Got Back Pain?

In a study at Georg August University, participants with chronic back pain underwent a leg‑flexion test. Researchers deliberately misinformed half of the volunteers that the test could exacerbate their pain, even though it could not.

The misled group reported doubled pain intensity and performed fewer flexions than the neutrally‑informed group. This experiment underscores the darker side of the placebo effect—how negative framing can amplify discomfort, reinforcing the need for careful communication in clinical settings.

3 Honesty Is Effective!

A 2018 trial at Dana‑Farber Cancer Institute examined whether transparent placebos could alleviate cancer‑related fatigue. Survivors were randomly assigned to receive a placebo with a clear disclaimer that it contained no active ingredients, while a control group received no intervention.

Participants who knowingly took the placebo reported a significant reduction in fatigue, whereas the control group’s symptoms remained unchanged. The findings highlight that even when patients are fully aware of the inert nature of a treatment, their brains can still generate genuine symptom relief.

2 Drunk on Placebo

Researchers Seema L. Assefi and Maryanne Gary explored whether belief alone could mimic intoxication. Subjects drank plain tonic water; half were told it was a vodka tonic, while the other half knew it was just tonic.

Those convinced they’d consumed alcohol displayed heightened confidence and a susceptibility to misleading information—behaviors mirroring genuine drunkenness—despite having no ethanol in their system. The study demonstrates that the mere expectation of alcohol can hijack the brain’s perception of sobriety.

1 The Placebo Effect in Nature

Poison‑ivy enthusiasts know the rash it causes, but a 1962 Japanese study flipped expectations on their head. Thirteen students hypersensitive to the irritants of a Japanese lacquer tree were exposed to two leaves: the irritant leaf on one arm and a harmless leaf on the other. Crucially, they were told the lacquer leaf was harmless and the benign leaf was poisonous.

All participants broke out in a rash on the “poisonous” harmless leaf, while only two reacted to the truly irritating lacquer leaf. This reversal illustrates that the brain can override physiological responses, convincing the immune system to react—or not react—based solely on belief.

The placebo effect happens when someone is given a pill, a shot, or some other form of treatment, and are told it will help with their ailments. They feel better, but it’s just their mind and body healing itself because the treatment is essentially fake. Researchers are very interested as to why it works, because understanding it will help with patient care and decrease the amount of drugs that need to be prescribed.

10. It Was Discovered to Protect Consumers

The first test for the placebo effect took place in the late 18^th century after a Connecticut doctor named Elisha Perkins was granted a patent for medical devices he called “tractors.” Perkins’ tractors were wand-like pieces of metal about three inches long. He claimed that they were made of special materials, but they were really just steel and brass. Perkins said that his tractors could help with sore joint and other aches and pains — he charged an enormous amount of money to run his tractors over the sore spot for about 20 minutes, and people claimed they felt better afterwards.

Other physicians were dubious about the powers of tractors, so a British doctor named John Haygarth performed tests with different materials like bone, a slate pencil and a tobacco pipe. He found that he could get similar results, and he concluded that any improvement the patient felt was just in the patient’s head.

9. It Has Physical and Psychological Responses

The placebo effect may seem like something that’s solely psychological, but there’s strong evidence that your body physically reacts to it. In 2005, researchers at the University of Michigan performed PET scans on 14 healthy young men. Their jaws were injected with a saltwater solution to cause pain. A short time later, they were given a placebo and told that medicine was on its way. On the scans, researchers saw that the area of the brain that releases endorphins was active after the placebo was given. The participants also claimed they felt less pain, and their tolerance for pain went up.

A study published in 2001 gave participants a placebo mixed with drugs that blocked endorphins. The result was no placebo effect. While research is still being conducted, these two studies show that endorphins may have a big role to play in making placebos effective.

8. The Bigger the Production, the Bigger the Effect

If someone is sick and needs treatment, one of the quickest and most effective ways to treat them is through an injection. That made researchers wonder — if pills gave a placebo effect, would a placebo injection be even more effective? Between 1956 and 1965, and then again in 2000 and 2006, there were tests that compared people who received placebo shots and people who were given sugar pills. In all of the studies, they found that when using a medical device such as a needle to give injections the subjects had greater improvements than the people who took the placebo orally. It speaks to the power of the placebo effect that symbols like needles, which are tied to treatment and cures for diseases, play such an important role.

7. Fertility Can Be Affected

Even fertility can be affected by the placebo effect. In one study, a group of 55 women that had polycystic ovarian syndrome were trying to get pregnant. Over the course of six months, 33 of the participants were given a placebo and 32 were given fertility drugs. Out of the placebo group, five of the 33 women got pregnant, while seven of the 32 women receiving the drugs were able to get pregnant, making the difference statistically insignificant. In other tests, the pregnancy rate is as high as 40% while taking a placebo. Researchers believe that the women in these tests were less stressed, making them more likely to get pregnant.

6. Placebos Can Negate the Effect of Drugs

In most placebo tests, they look to see if a fake drug or treatment can help someone. However, it can also have the opposite effect and suppress the ability of actual drugs if the person isn’t expecting them to do anything. Researchers in Germany and the United Kingdom looked at brain scans of people who were given painkillers — half the group was told they’d be given strong painkillers, while others were just told they’d be given a placebo. They found that people who were told they’d be given the painkillers had signs of relief, while those who thought they were taking a placebo had the effectiveness of the drugs completely eliminated. Positive thinking helps, but expectations are important as well.

5. Price of Treatment Affects Results

Researchers at the University of Cincinnati performed a test on 12 people with moderately advanced Parkinson’s. They gave each of them a placebo and told them that they were effective for the treatment of Parkinson’s, but some were told their pills were 15 times more expensive to make than the alternative. Those who received the “expensive” placebo showed a greater improvement than people who took the “cheaper” placebo. In another test, 67% of the participants had improvement from the expensive placebo, while 58% said they felt better after taking the cheap placebo. These tests show how much our expectations play into medical treatment. If someone’s medication costs more, they have higher expectations for it to work.

4. Brand Names Affect Results

The perceived cost isn’t the only thing that changes how well a placebo works. Studies have shown that people believe brand name drugs are more effective than generic drugs, even though both drugs are identical in every aspect except for name, color, shape and size.

Brand name drugs are much more expensive because pharmaceutical companies put a lot of money into research, development and marketing. A generic drug is released after the patent runs out, which is 15 years after regulators approve it. So while prescribing brand names after that period is an incredible waste of money for insurance companies and patients alike, they’re more effective simply because people think they’ll be. They’re not inherently superior, but we have a tendency to connect brand names to quality.

3. Placebos Work Better Than Ever Before

Researchers have found that the placebo effect is getting more powerful, especially in studies that involve antidepressants, anti-anxiety agents and pain relievers. This strange phenomenon has been a problem for pharmaceutical firms, because it makes it more difficult to get drugs approved by the FDA. One theory is that people now have more faith in doctors and pharmaceuticals. During studies for drugs, participants get one-on-one attention from the doctors who prescribe them medication. Just visiting a doctor has therapeutic powers, and then they prescribe drugs that the participants expect to work. Our expectations have been raised, making placebos more effective in an almost cyclical relationship.

2. It Can Still Work Even If You Know

Even when people know they’re taking a placebo, the treatment can still be effective if they expect it to be. Researchers at Harvard performed a study on 80 patients who suffered from irritable bowel syndrome (IBS). Half of them didn’t take anything, and the other half took placebo pills. They were plainly told that they were “placebo pills made of an inert substance, like sugar pills, that have been shown in clinical studies to produce significant improvement in IBS-symptoms through mind-body self-healing processes” (note the difference from entry six, where patients were explicitly told that the placebos didn’t work). They even printed Placebo on the bottle.

By the end of the test, about twice as many people in the placebo group felt better than the control group. Amazingly, the known placebos worked as well as some of the strongest IBS medication.

1. Placebo Surgery is Effective

It’s one thing to take a pill or receive a shot as a placebo, but surgery is another matter. A surgery physically changes someone, but crazily enough a number of different studies have shown that people feel better and start to heal after placebo surgeries. In Finland, surgeons had patients come in to have surgery to repair torn cartilage. Half the patients received the surgery. The other half were anesthetized, then the doctors cut them open and pretended to perform the surgery, going through all the same motions but not actually operating. Amazingly, both groups improved.

Another study found this worked on people with broken vertebrae. Half of the test subjects would go in for vertebroplasty, which would reconstruct the vertebrae, while the other half was given a placebo surgery. In two different trials, they found the placebo surgery worked just as well as the real surgery. There are still a lot of questions about how placebo surgeries work, but the implications are staggering.