Do Supplements Work: The $50 Billion Industry That's Mostly Selling You Expensive Piss
- Courtney Heard
- Apr 7
- 14 min read
Updated: Apr 7
The supplement business is a beautiful scam, really. A gleaming, well-lit cathedral of American anxiety where fear, vanity, middle age, and disposable income meet under fluorescent lights and whisper, maybe this capsule will save me.
But, ladies, gents, and enbies, that business made over $50 billion last year.
Billion.
With a B.
That is more than the GDP of some countries. That is an incomprehensible amount of money flowing toward capsules, powders, gummies, and tinctures that, in a staggering number of cases, do exactly one clinically verified thing and one thing only:
Make your pee more expensive.
Marinade on that for a second.
You are not buying health. You're buying expensive (often neon) piss.
My friends, you are buying the idea of health, packaged in a pastel bottle with a leaf on it. And what's worse, it's sold to you by a website that also sells jade eggs for your front bum and refers to your gut as your "second brain." The supplement aisle is what happens when capitalism discovers that people will pay for hope if you put it in a capsule and slap "synergistic blend" on the label. It's the nutritional equivalent of thoughts and prayers: it feels like doing something, it looks like doing something, and the evidence that it actually does something ranges from "thin" to "you're literally just funding someone's Cybertruck."
This is not reality-based living.
That does not mean all supplements are nonsense. Some are useful. A few are genuinely important. But they are buried in the same aisle as the lunacy, suffocating under “detox,” “glow,” “optimized absorption matrix,” and the unholy marriage of TikTok lighting and affiliate codes.
So let's do what the supplement industry is desperately hoping you will never do. Let's look at the actual research. The real studies. The data that was not funded by the company selling the product and interpreted by a man named Chad on YouTube who calls you, "chat", has radioactive veneers, and constantly pushes a coupon code for bro cookies (that's what I call protein bars).
You're welcome. The evidence thanks you for showing up.
The Supplements That Actually Work (Don't Faint, There Are a Few)
Before you accuse me of being a joyless skeptic who hates wellness, let me be clear: I am a joyless skeptic who hates wellness culture, thank you very much. Wellness itself is great. Eat your vegetables. Go outside. Move your body. Sleep. Drink water like a person who understands biology. That's wellness. What is not wellness is spending $78 a month on a subscription box of capsules curated by an algorithm and a naturopath who communicates exclusively in Instagram stories with the Clarendon filter and whose business partner is an alien named Vorben.
That said, some supplements do work. Here they are. Guard them with your life because they are surrounded on all sides by nonsense.
Vitamin D: The One Your Pale, Indoor-Dwelling Body Probably Needs
If you live above the 37th parallel, work indoors, wear sunscreen like a person who has heard of dermatology, or simply exist in any modern capacity whatsoever, there is a very real chance you are low on vitamin D. Deficiency is genuinely common, particularly in northern latitudes, and I'm Canadian so trust me on this one: the sun abandons us like a deadbeat dad for eight months a year and our bones have feelings about it.
Supplementation in deficient individuals is well supported for bone health and immune function. It's not controversial, friends. This is your doctor running a blood test and saying, "Yeah, you need more of this," which, and I cannot stress enough, is the correct way to determine whether you need a supplement. A blood test. Administered by a medical professional. Not a quiz on a supplement company's website that mysteriously concludes that you just so happen to be deficient in everything they sell.
Omega-3 Fatty Acids: For Your Heart, Not Your Influencer's Wallet
The evidence for omega-3s, specifically EPA and DHA from fish oil, is solid for cardiovascular health, particularly in people who don't eat much fatty fish. The REDUCE-IT trial showed meaningful reductions in cardiovascular events with high-dose EPA. This is real. This is published. This is not a guy on a podcast saying "I just feel amazing" while half-submerged in ice water.
All of that said, I learned very quickly after my laser eye surgery that the quality of Omega-3s actually matters. Source matters. Dosage matters. Buying a random fish oil capsule from a gas station shelf where it's been baking under fluorescent light since before the Clinton Administration is not the same thing as taking a pharmaceutical-grade omega-3 under medical guidance. One of those is evidence-based medicine. The other is a gamble with the structural integrity of your next burp.
I know, I know, you're wondering, 'but how do I know the quality, source and dose, GM?' and to that I will say, honey, I need to gently remind you that doctors exist. No single influencer is going to tell you what you need. Not me. Not the Hawk Tuah girl. And certainly not a crunchy, white mom on TikTok in appropriated dreads trying to teach you wellness to the tune of a reggae song.
Girlfriend, the influencer you're looking for is your family Doctor.
Folate: If You're Pregnant or Planning to Be, This One Gets a Pass From My Wrath
Neural tube defects. That's the conversation. Folate supplementation before and during early pregnancy is one of the most well-established supplement recommendations in modern medicine, backed by decades of data and the reason we fortify grain products. Take your prenatal. This is not the hill I'm dying on. This is the hill everyone should be standing on, alive, holding a bottle of folic acid. Healthy babies and safe pregnancies. We can all agree these are good things. Right?
Magnesium: The Quiet Achiever Nobody Talks About Because It's Boring
A genuinely large percentage of the population doesn't get enough magnesium from diet alone, and magnesium is involved in over 300 enzymatic reactions in your body. It does more than most supplements have ever dreamed of doing, and it does it without a YouTube channel, detoxing, or a diffuser. Supplementation has decent evidence for sleep quality and migraine frequency in people who are deficient. It is the unsexy, reliable, shows-up-to-work-on-time supplement. Nobody is building a brand empire around it. Nobody is filming TikToks about their "magnesium glow-up." And honestly, that makes it easier for me to trust it.
Well, that and the fact that my perimenopause "journey" has been more like a haunted tour of my brain and the only thing that has helped me fall asleep and stay asleep all night is my magnesium supplements. For that, I wish I could sing like an entire angelic choir, but I will settle for a short golf clap.
Do Supplements Work? For Most of What You're Buying, Absolutely Not.
Here's where the industry earns its real money. Not on the stuff that actually works, but on the stuff that sounds like it should work because someone put it in a matte bottle with serif font and called it "holistic." This is the part where the $50 billion starts to look like eerily similar to a collection plate at a megachurch.
The Daily Multivitamin: The Greatest Scam in Your Medicine Cabinet
The multivitamin is the supplement industry's masterpiece of misdirection. A little bit of everything. A meaningful amount of nothing. It sits in your cupboard radiating the energy of DJ Khaled yelling his own name. It's like Tom from MySpace acting like he invented the internet. Maybe you might get a glucose boost, but aside from that, your $40 multivitamin gummies are just really expensive candies and Linda, if you're gonna binge, make it Nerds Gummy Clusters. At least they're not lying to you when they deliver a texture extravaganza that tickles your brain.
For generally healthy adults, multivitamins have shown little or no meaningful benefit for preventing cardiovascular disease, and the broader evidence for cancer prevention is underwhelming enough that major guideline bodies still don’t recommend them for that purpose.
Your kidneys are filtering out what your body doesn't need, and you are flushing the surplus down the toilet. You are, quite literally, producing the most expensive urine in your postal code. Your pee is bougie now. Congratulations. That's where your money went.
If you eat a reasonably varied diet, which does not need to be perfect, it just needs to occasionally include a vegetable that isn't ketchup, you are almost certainly getting what you need. And if you're not? A multivitamin's scattershot approach is not the fix. Targeted supplementation based on bloodwork is.
But that involves a doctor. A real one.
Not one who sells supplements from their website and refers to inflammation like it's a sentient villain in a Marvel film.
It always seems to come back to that, doesn't it? Just go talk to your family doctor.
Snake Oil Science: The Truth about Complementary and Alternative Medicine by R. Barker Bausell
The Wellness Trap: Break Free from Diet Culture, Disinformation, and Dubious Diagnoses, and Find Your True Well-Being by Christy Harrison
Biotin for Hair and Nails: A Fairy Tale in Capsule Form
Unless you have a diagnosed biotin deficiency, which is about as rare as a humble televangelist, biotin supplements are doing approximately nothing for your hair and nails. The evidence is not there. What is there is an industry that looked at human insecurity about thinning hair and saw only a way to monetize desperation. And they were right, because here we are, buying it by the fuckton.
Here's the fun bonus: biotin supplementation can interfere with certain lab tests, including thyroid panels and troponin assays used to diagnose heart attacks.
So you paid for a supplement that doesn't help your hair but might make your doctor think you're in need of a priest.
Peak efficiency, Becky. Golf clap. 👏
Multivitamins are the supplement equivalent of Trumplestiltskin's button mushroom: entirely impotent.
Collagen Supplements: You Are Eating Protein and Calling It a Time Machine
I need you to understand something about digestion, because the collagen supplement industry is hoping desperately that you don't. When you ingest collagen, your body breaks it down into amino acids, the same way it breaks down a chicken breast or a handful of lentils or that sad desk lunch you ate at 2pm. Your stomach does not look at the collagen peptides and go, "Ah, this is clearly meant for the face. Route it to the face." That is not how any of this works. That has never been how any of this works. Your digestive system is not a concierge.
Mama, RonDon McNugs do the same thing as your $80 collagen gummy.
The clinical evidence for oral collagen improving skin elasticity is thin, often industry-funded, and plagued by small sample sizes, short study durations, and the kind of methodological optimism that would get you laughed out of a first-year stats class. You know what does have evidence for skin health? Sunscreen. Water. Not smoking. But those don't come with a subscription model and an ambassador program, so here we all are, drinking bovine collagen smoothies and calling it self-care. The absolute state of us.
Detox Supplements: Your Liver Would Like to File a Restraining Order
You have a liver. Right now. It is inside you, doing its job, for free, without the assistance of a $40 charcoal lemonade or a milk thistle capsule wrapped in the aesthetic of a Balinese yoga retreat. Your liver and your kidneys are detoxing you as you read this sentence. They have been doing this since before you were born. They are extremely good at it. They did not ask for help. They do not need a side hustle.
Now, listen, I get it. We all grew up in late-stage capitalism and so it feels weird to accept that a problem is already being solved before you had a chance to throw money at it, but rest assured, if your liver and your kidneys were not doing what they are supposed to, you would be well aware. Them puppies be workin'.
The concept of "detoxing" via supplement is not a medical concept. It is a marketing concept. It preys on the vague, squishy, evidence-free feeling that modern life is "toxic" and your body needs intervention from a product to handle it. Your body has been handling it since forever and it finds the suggestion that it needs assistance from a capsule full of dandelion extract genuinely insulting. If your liver could talk, it would be filing complaints with the CRTC because this level of disrespect should be criminal.
The Supplements That Will Actually Hurt You (Surprise! They Don't Just Fail. Some of Them Fight Back.)
Up to this point, the damage has been to your wallet. From here on out, it gets more personal. Most of this industry is built on doing nothing. A small but important slice is built on doing harm. Some of it is actually doing harm. You can laugh off useless. You don’t get to laugh off dangerous.
Kava: Relaxation With a Side of Liver Failure
Kava is marketed like a velvet curtain you can pull over your own thoughts: calm, clarity, maybe even a little enlightenment if you sip it slowly enough and pretend your inbox doesn’t exist. Traditionally used in Pacific Island cultures in ceremonial contexts, it’s now been repackaged for Karen as a “natural” fix for anxiety, stress, and sleep.
In reality, however, it's the herbal equivalent of trying to outrun your own shadow.
The claims are seductive: take this, and the edge comes off. Your thoughts soften. Your body unclenches. You become the kind of person who journals at sunrise instead of rage-scrolling at midnight. And because it’s a plant, because it’s “ancient,” because it comes in earth-toned packaging with words like balance and restore, it gets to bypass the usual skepticism we’d apply to anything else making those kinds of promises. Which is convenient. For them.
Because kava is dangerous.
Kava supplements have been linked to severe hepatotoxicity, including cases requiring liver transplants. This ain't your average "discomfort." Not just "some bloating." Liver. Transplants.
Several countries have banned or restricted kava-containing products entirely. But sure, Brenda, take the unmarked capsule you bought from a website with a sunset in the header and a font that whispers "calm" because you "just feel more zen."
Your liver is quietly consulting a divorce lawyer.
High-Dose Vitamin E: The Antioxidant That Chose Violence
Vitamin E gets sold like a golden ticket. Antioxidant. Skin glow. Cellular protection. The word itself sounds like it should come with a halo and a soft piano track. It’s the kind of supplement that makes people feel like one more dose and they'll have the glowing skin of Reese Witherspoon or Kate Hudson. Consumers feel like they're fighting off invisible damage, aging more gracefully, becoming the kind of person who moisturizes and supplements.
And in normal amounts, fine. Eat your almonds, drizzle some olive oil, live your life.
But the supplement aisle doesn’t deal in moderation, does it?
It deals in escalation.
Bigger doses, bigger promises, bigger margins. And at some point, the thing that was supposed to protect you starts behaving like it has a vendetta.
The SELECT trial, a massive study involving over 35,000 men, found that high-dose vitamin E supplementation significantly increased the risk of prostate cancer.
I want to say that again, louder, for the people who are currently mid-swallow on a vitamin E megadose because a wellness blog told them it would make their skin dewier than Trump's forehead when he spots nuggies: it increased the risk of cancer.
Not decreased.
Increased.
The supplement was supposed to protect you and instead it went rogue like a mall security guard with a god complex. You were doing better before you took it. The nothing you were doing before was medically superior.
The Skeptics' Guide to the Future: What Yesterday's Science and Science Fiction Tell Us About the World of Tomorrow by Dr. Steven Novella
Weight Loss and Bodybuilding Supplements: The Wild West, But With Organ Damage and Before-And-After Photos
Walk into any supplement aisle and you’ll find the before-and-after industrial complex in full bloom. Fat burners that promise to melt you down to your “leanest self.” Pre-workouts that read like a chemistry set who identifies as "alpha." Muscle builders that swear they’ll turn your Tuesday into a Marvel origin story. It’s all urgency and testosterone and fonts that look like they bench press. These products are sold as shortcuts: burn faster, lift harder, recover quicker. There is no patience required, no nuance allowed. Just scoop, shake, conquer.
And people buy it. Of course they do. Because the pitch is irresistible: you can outsmart biology with a tub of powder and a shaker bottle adorned with flames and lightning bolts.
But you can't. And sometimes the attempt can cause problems.
The FDA has found undeclared pharmaceutical ingredients in hundreds of weight loss and bodybuilding supplements. Actual prescription drugs. Banned substances. Compounds that were never approved for human consumption. People have died. Not hypothetically. Not in a thought experiment. Actually, verifiably, documented-in-medical-literature died. From supplements sold with five-star reviews and transformation photos.
The entire supplement industry in the United States operates under DSHEA, a 1994 law that essentially lets manufacturers sell products without proving they're safe or effective first. The FDA can only step in after someone gets hurt. That's like hiring a building inspector who only shows up after the roof caves in and kills someone. It is the regulatory equivalent of "thoughts and prayers" and it has the same body count problem.
So, Do Supplements Actually Work? The Honest Answer.
Some do. Most don't. A few will actively harm you. And the industry selling them to you has a multi-billion dollar financial incentive to make sure you never figure out which is which.
If you want to know whether you need a supplement, do the boring thing. Get the bloodwork done. Talk to a doctor who does not sell supplements from their own website. A doctor whose office does not have a diffuser going and a chalkboard sign that says "Wellness is a journey" in vegan, grass-fed chalk.
Targeted supplementation based on a documented deficiency is medicine. Swallowing fourteen capsules every morning because a podcast guest with radioactive veneers and a mushroom farm told you to "just trust the process" is not medicine.
It's a subscription to someone else's mortgage payment, Jennifer. You're contributing to someone else's kids' college fund and getting diarrhea for the effort.
This is not boss behaviour.
The supplement industry is counting on you not reading the research. It is counting on your trust, your anxiety, your quiet hope that there is a shortcut in a bottle. And for the vast majority of what's on those shelves, the only thing you're producing is extremely expensive pee, flowing from your body and into the sewage system, carrying with it your money and your faith in capsule-based salvation.
Put the self-prescribed supplements down. Pick up a vegetable. Go outside. Get some sun. Read my book. Your body already knows what to do. It's been doing it since before some guy in a warehouse decided to put turmeric in a gelatin cap and charge you $34.99 for the privilege.
Or, the one thing that will actually help:
Talk to your fucking doctor.
Sources
Cardiovascular Risk Reduction with Icosapent Ethyl for Hypertriglyceridemia
Folic acid, healthy pregnancy and neural tube defect prevention
Do Canadian Adults Meet Their Nutrient Requirements Through Food Intake Alone?
The Role of Magnesium in Sleep Health: a Systematic Review of Available Literature
Vitamin E and the Risk of Prostate Cancer - The Selenium and Vitamin E Cancer Prevention Trial
Kava, the anxiolytic herb: back to basics to prevent liver injury?
Comments