Know What You're Buying: Independent Supplement Reviews Built on Evidence

What makes a trustworthy supplement or product review?

Most review sites in this space are built to sell, not to inform. A five-star score and a countdown timer show up regardless of what's actually in the bottle. We think a review is only useful if it would survive contact with the label. Every Nutrametric review examines the same things, whether the product is a supplement, a wearable, or a skincare cream:

• Ingredients and dosages: not just which compounds are listed, but whether the amount on the label matches what published research actually used
• Published research: what studies exist on the specific ingredients, at the specific doses, and whether the marketing claim goes further than the evidence supports
• Manufacturer transparency: whether the official page discloses a real ingredient panel, price and terms, or hides behind a video sales pitch
• Refund policy: the stated guarantee window, and whether we found any discrepancy between marketing copy and the formal terms
• Known side effects and interactions: medication interactions, allergens, and who should check with a doctor first
• Scientific plausibility: whether the underlying mechanism the brand describes is consistent with how the body actually works

Sometimes a page doesn't give us enough to check one of these: an undisclosed ingredient list, a narrator we can't verify, a price hidden behind a video. When that happens, we say so plainly instead of filling the gap with confident-sounding filler. That's usually the most useful part of the review, not a footnote.

We also classify every product before we write a word about it. Some formulas genuinely work, just at a weaker dose or a different mechanism than the ad implies. We call these real, but overstated, and we still explain the guarantee, the bundle pricing and who it suits. Others make a central claim that's false, unverifiable or contradicted by independent testing: a checkout page that never shows an ingredient panel, a device category already debunked by regulators, a mechanism that doesn't match basic physiology. We call these not what it claims to be, and no amount of good copy moves them up the rating. The distinction decides how a review is structured, not just what score it gets.

What Nutrametric covers

Our nine categories map to the questions people actually type into Google before buying: weight-loss formulas built around metabolism, thermogenesis, appetite control and GLP-1-adjacent marketing; male enhancement and testosterone-support products addressing libido, blood flow and hormonal balance (18+); joint-pain formulas citing glucosamine, collagen, boswellia and other anti-inflammatory botanicals; blood-sugar support built around berberine, chromium and cinnamon extract; hearing supplements; digestive-health products including probiotics and parasite-cleanse claims that deserve real scrutiny; liver-health formulas built around milk thistle and silymarin; heart-health products addressing cholesterol, blood pressure and circulation; and skincare and anti-aging creams.

Across all of it, the same rule applies: a well-known, well-studied compound (zinc, magnesium, green tea extract, milk thistle) doesn't automatically make a formula effective. The dose has to match what the cited research actually used, and the brand has to disclose that dose in the first place. A lot of our lower scores come down to exactly that gap, not to the ingredient being fake or dangerous.

About Nutrametric

Nutrametric is an independent review site covering dietary supplements, wellness devices and skincare products sold in English-speaking markets, France, Germany and the Netherlands. We started this project because most marketing in this space leans on vague promises and manufactured urgency. We think readers deserve a plainer, more honest breakdown of what a product's ingredients, mechanism and specifications actually suggest before they spend money on it.

Each review follows the same approach regardless of category: we read the label and the maker's own claims, note where the underlying research is solid and where it's thin, and flag anything that looks like an unsupported promise. We do not accept payment for a positive review, and our "Nutrametric Score" is an editorial opinion, not a customer rating. We say so clearly on every page.

This site earns money through affiliate links: if you buy a product after clicking through from one of our reviews, we may earn a small commission at no extra cost to you. That relationship never changes what we write. If we think a product is mediocre, or a video sales pitch doesn't hold up, the review says so, even when the product is one of our own paying offers.

We're currently expanding category by category: weight loss, male performance, joint pain, blood sugar, hearing, digestive health, liver health, heart health and skincare, across four language markets. New reviews and blog articles are added regularly. Check back, or follow the category pages directly for updates.

The site started narrower than it is today. Early reviews covered only a handful of weight-loss and male-performance supplements. We added joint pain, blood sugar and hearing as the catalog grew, then digestive health and liver health, then a heart-health section once we had a product worth reviewing honestly in it. Skincare came later still, once it became clear the same ingredient-and-evidence standard applies just as well to a face cream as to a capsule. The dermatology changes; the need for honest sourcing doesn't.