Supplement Insider Evidence-based wellness
Independent research, updated weekly

Know what the science
actually says.

Plain-language reviews of vitamins, minerals and supplements — each one graded by the strength of its evidence, not its marketing.

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Ashwagandha Lutein & zeaxanthin L-citrulline Ginkgo biloba Tribulus terrestris
Written from the papers

Every claim traces back to a published trial, cited inline.

Graded, not hyped

Strong, moderate or limited — stated up front, before the verdict.

Editorially reviewed

Checked for accuracy in-house, with the review date on each page.

We tell you our stake

We sell some formulas we cover. Disclosed on every one.

FDA registration means a facility is listed with the FDA and open to inspection. It is not FDA approval — no dietary supplement is FDA approved.

Editor's picks

All products →

Ratings are copied from each product's own page and move as new reviews arrive — the figure there is always the current one. Every card links to the evidence first and the official site second. Drag or flick the row.

We make and sell some of the formulas above, so we have a commercial interest in them. How we keep research and commerce separate →

What we read this week

All research →
Strong evidence Circulation · 5 min
L-citrulline for blood flow: does it actually work?

Multiple randomised trials point the same way on nitric-oxide production — with a caveat on dose.

Strong evidence Weight · 6 min
Does glucomannan really curb appetite?

The fibre research on fullness is unusually consistent. The effect size is smaller than the ads imply.

Moderate evidence Vision · 6 min
Bilberry and lutein: do they support eye health?

Lutein and zeaxanthin have the better dataset. Bilberry's is thinner than its reputation suggests.

Moderate evidence Sleep · 5 min
Does magnesium glycinate improve sleep?

Small trials, real effects on sleep latency, mostly in people who were low to begin with.

Moderate evidence Joints · 7 min
Does glucosamine actually reduce joint pain?

Two large trials disagree. We walk through why, and which one better matches your situation.

Limited evidence Men's health · 7 min
Tribulus terrestris and testosterone

What the trials found on libido and hormone levels — and what they did not find.

Start from your goal

Fifteen areas, each with the ingredients that have evidence behind them and the ones that don't.

Memory & focus Sleep Vision & eye health Heart & blood pressure Joint health Blood sugar support Weight management Gut health Inflammation Men's health Skin & rejuvenation All 15 goals →
Buyer's guide
How to read a supplement label

Dose, form, bioavailability, proprietary blends — the four things worth checking.

Compare
Two formulas, side by side

Ingredient-by-ingredient, with the evidence grade on each row.

Editorial policy
How we review, and who pays

Our grading scale, our review process, and exactly where our money comes from.

New research, once a week.

What changed in the evidence, in plain language. One email, no product pushes.

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