Independent supplement ratingsUS and Canada · Updated weekly
A ratings desk for a category that has spent thirty years grading its own homework.
A ratings desk for a category that has spent thirty years grading its own homework.
Free tools that answer a number, then point you to the products that fit it. No sign-up. Answer a number, then see the products that fit it.
See which ingredients in a product are under, at or over the studied dose.
Working nowDaily protein by body weight and goal, plus the per-meal number.
Working nowYour daily calorie burn, via the Mifflin-St Jeor equation.
Working nowSodium and fluid to replace for a training session.
Working nowDaily elemental magnesium target by age and sex.
Working nowA sensible single dose and daily ceiling by body weight.
Working nowEvery calculator here exists because a supplement decision starts with a number you probably do not have. How much protein your body weight actually calls for. How much sodium a hard, sweaty hour costs you. What a sensible daily ceiling for caffeine looks like at your size. Get the number, and most of the marketing answers itself.
The protein target follows the intake meta-analyses rather than the label on a tub. The TDEE calculator uses the Mifflin-St Jeor equation, which is the one most dietitians reach for. The magnesium page works from the published daily intake figures by age and sex, and the electrolyte tool from measured sweat-sodium ranges. Each tool states its source and its assumptions on the page, including where individual variation makes the answer a starting point rather than a prescription.
The Label Dose Checker is the one this site is built around. Pick a product and it lines up every active ingredient against the dose used in published trials — under, at, or over — with no interpretation needed. It is the fastest way to see that a well-known testosterone booster fails on its first ingredient.
All of it is free, none of it asks for an email, and none of it is medical advice. If you take prescription medication, a supplement decision belongs with a clinician before it belongs with a calculator.