This week: do apple cider vinegar gummies actually melt belly fat? Plus collagen, sea moss, and shilajit — real or noise.

The pitch: drink collagen, rebuild your face. The surprise: this is a rare aisle where the trials mostly line up — pooled across 23 randomized, placebo-controlled studies, collagen modestly improved skin hydration, elasticity, and wrinkles over 6–12 weeks (2025 meta-analysis). The caveats that keep it honest: the effect is modest (not “reverse aging”), the “collagen you swallow becomes collagen in your cheeks” mechanism is a fairy tale (you digest it into amino acids), and the strongest, non-industry-funded trials are the least impressive. A small, real perk — not a face-lift.

The pitch: a spoonful of Atlantic seaweed for immunity, energy, and a “balanced” thyroid. The catch: the human evidence for those benefits is essentially non-existent — it's test tubes and TikTok, not trials. What sea moss reliably contains is iodine — a lot of it, in wildly variable amounts. In one published case, Irish sea moss tipped a patient with Graves' disease into full-blown thyrotoxicosis (2021 case report). The one real effect is the one nobody's advertising — and it can land you in the ER.

This one isn't a clean myth. In a small randomized trial, purified shilajit (250 mg twice a day for 90 days) did nudge total and free testosterone up versus placebo (2016 trial). But a nudge in about 60 middle-aged men is a long way from the “male vitality cheat code” your feed is selling — and raw, unpurified resin carries a real risk of lead, mercury, and arsenic. A little bit real, wildly oversold, and only if it's actually purified.

Start with what's true, because there is a real thread here. Apple cider vinegar isn't nothing. A 2025 systematic review pooled 10 randomized trials and found that a daily dose of liquid ACV — around 30 mL — produced a modest, short-term dip in weight and BMI in people who were overweight or diabetic (2025 meta-analysis). Modest. Short-term. In liquid form. Hold onto all three words — the marketing drops every one of them.

The step the reel skips is the one that just blew up in public. The reason your feed erupted with “ACV melts fat” wasn't that careful review — it was one splashy 2024 trial claiming dramatic weight loss in young people. In 2025 that study was retracted for implausible data, statistical problems, and an unregistered protocol (BMJ retraction notice). The single loudest piece of “proof” behind the trend no longer officially exists.

And here's the part the gummy label really doesn't want you to notice: the modest signal came from vinegar you drink, not candy you chew. Independent lab testing found some gummies deliver as little as roughly 8 mg of acetic acid apiece — a rounding error next to the ~750 mg in a single tablespoon of vinegar — while about half the gummy's weight is added sugar (independent ConsumerLab testing). You're paying for sugar-dusted pastilles to chase a small effect that needed real vinegar — a lot of it — to show up at all.

A tablespoon or two of diluted apple cider vinegar before meals, alongside an actual calorie-controlled diet, can nudge blood sugar and produce a small, short-term dip in weight. That's the entire real effect — and it's the liquid, not the gummy, and it's a nudge, not a fat-melter. Skip it if you have reflux or take medications that lower blood sugar or potassium, and rinse your mouth so the acid doesn't chew on your enamel.

Not every supplement is a scam. If you're genuinely deficient — common if you're indoors all winter, older, or have darker skin — vitamin D clearly helps your bones and your bloodwork (NIH Office of Dietary Supplements). The fine print: once you're not deficient, piling on more doesn't buy extra protection against falls or fractures. Test, then treat — don't mega-dose on faith.

Magnesium is having a moment as the drug-free Ambien. The evidence underneath is thin: a meta-analysis of the insomnia trials found them small and low-quality, worth maybe ~17 fewer minutes to fall asleep — barely a nose ahead of placebo (2021 meta-analysis). It's cheap and safe, so no harm in trying — just don't expect the miracle the “magnesium at night” reels promise.

This week's gold medal in mental gymnastics goes to the wellness creator who explained that sea moss “detoxes” your thyroid because it's “made of the same 92 minerals your body is.” Two small problems. Your body isn't a bag of 92 minerals, and “full of iodine” is the opposite of “detoxes your thyroid” — it's the thing that can set it on fire. Ninety-two out of ten for confidence.

One line for your back pocket: “real in a glass, real in a lab, real if you're deficient” is not the same as “real in this bottle.” The supplement aisle's whole trick is taking a modest, specific finding and stapling it onto a product that never delivers the dose. Before you trust the gummy, ask what form the study actually used.

One claim. One verdict. Two minutes.

We're back Wednesday with a single trend pulled straight from the feed and dropped on the scale. I'm locking in which one gets graded this week — hit reply and tell me what's flooding your timeline, and it might be the one.

Be honest — is there an apple cider vinegar product in your cupboard right now?