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Today's Deals Categories Beauty & Longevity Gut & Digestion Herbs & Botanicals Omega & Healthy Fats Protein & Fitness Sleep, Stress & Brain Vitamins & Minerals Weight Management Comparisons Company How We Test About Us Contact Us
All categories Beauty & Longevity 28 comparisons › Gut & Digestion 13 comparisons › Herbs & Botanicals 16 comparisons › Omega & Healthy Fats 13 comparisons › Protein & Fitness 56 comparisons › Sleep, Stress & Brain 14 comparisons › Vitamins & Minerals 45 comparisons › Weight Management 57 comparisons ›
Beauty & Longevity Compare beauty and longevity supplements, including collagen, biotin, CoQ10, NMN, and resveratrol for skin, hair, and healthy aging. View hub ›

More comparisons in this category are coming soon.

Gut & Digestion Compare digestive health supplements, including probiotics, prebiotics, fiber blends, digestive enzymes, and psyllium husk for gut support. View hub ›

More comparisons in this category are coming soon.

Herbs & Botanicals Compare herbal and botanical extracts, including ashwagandha, turmeric and curcumin, ginseng, garlic, milk thistle, and berberine supplements. View hub ›

More comparisons in this category are coming soon.

Omega & Healthy Fats Shop omega-3 and essential fatty acid supplements, including fish oil, krill oil, algal oil, and plant-based options for heart and brain health. View hub ›

More comparisons in this category are coming soon.

Protein & Fitness Protein powders and workout supplements, including whey, casein, plant protein, creatine, BCAA/EAA, pre-workout, beta-alanine, and electrolytes. View hub ›

More comparisons in this category are coming soon.

Sleep, Stress & Brain Sleep, stress, and cognitive support supplements, including melatonin, magnesium glycinate, L-theanine, nootropics, and adaptogens. View hub ›

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Vitamins & Minerals Compare single-nutrient and multivitamin supplements, including vitamin A through K, magnesium, zinc, iron, calcium, and selenium formulas. View hub ›

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Weight Management Weight management supplements, including meal replacement shakes, appetite suppressants, berberine, CLA, and metabolism support formulas. View hub ›

More comparisons in this category are coming soon.

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Science-based supplement reviews

Honest supplement reviews, backed by the label

Nutrition Comparison is a science-based dietary supplement review platform. Our team reads every ingredient panel and certificate of analysis so you do not have to guess whether a bottle delivers what it claims.

Browse Categories How We Test
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243 Comparisons published
931+ Products read label by label
100% Guides fact checked before publishing
$0 Paid placements accepted

Browse by category

Same method, every category
Beauty & Longevity Compare beauty and longevity supplements, including collagen, biotin, CoQ10, NMN, and resveratrol for skin, hair, and healthy aging. 28 comparisons ›
Gut & Digestion Compare digestive health supplements, including probiotics, prebiotics, fiber blends, digestive enzymes, and psyllium husk for gut support. 13 comparisons ›
Herbs & Botanicals Compare herbal and botanical extracts, including ashwagandha, turmeric and curcumin, ginseng, garlic, milk thistle, and berberine supplements. 16 comparisons ›
Omega & Healthy Fats Shop omega-3 and essential fatty acid supplements, including fish oil, krill oil, algal oil, and plant-based options for heart and brain health. 13 comparisons ›
Protein & Fitness Protein powders and workout supplements, including whey, casein, plant protein, creatine, BCAA/EAA, pre-workout, beta-alanine, and electrolytes. 56 comparisons ›
Sleep, Stress & Brain Sleep, stress, and cognitive support supplements, including melatonin, magnesium glycinate, L-theanine, nootropics, and adaptogens. 14 comparisons ›
Vitamins & Minerals Compare single-nutrient and multivitamin supplements, including vitamin A through K, magnesium, zinc, iron, calcium, and selenium formulas. 45 comparisons ›
Weight Management Weight management supplements, including meal replacement shakes, appetite suppressants, berberine, CLA, and metabolism support formulas. 57 comparisons ›

Latest comparisons

243 published

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Only products that already earned an NC Score in one of our guides. Prices are pulled from our last scan and can change on Amazon at any time.

Meet the team

Who writes these comparisons

Three people work on every guide: one editor who builds the comparison sheet, a supplement researcher who checks every dose and interaction claim against published studies, and a coach who covers workout and recovery products. Nobody publishes their own review unchecked.

Our standing rules
No brand sees a guide before it publishes, and no placement is for sale. A dose or interaction claim never ships without a second reviewer signing off. This site is educational, not medical advice. We are not doctors.
Theresa Monroe Theresa Monroe Senior Health & Wellness Editor

Theresa Monroe is a Seattle-based wellness coach and health editor. Armed with a degree in Public Health from Portland State University and a Certified Nutrition Coach credential, she spent over a decade helping families navigate complex supplement labels. She focuses on translating dense nutritional research into practical, honest reviews for everyday health.

Silas Bancroft Silas Bancroft Independent Supplement Researcher

Silas Bancroft is a nutrition researcher based in Boston, Massachusetts, specializing in dietary supplements for healthy aging. Holding a B.S. in Biology from the University of Massachusetts Boston, he evaluates clinical studies behind longevity vitamins, joint support formulas, and cognitive supplements. Silas provides clear, evidence-based supplement reviews to help seniors make informed wellness choices.

Zayden Maddox Zayden Maddox Fitness Coach & Product Reviewer

Zayden Maddox is a Denver-based sports nutrition coach specializing in workout supplements. With a B.S. in Kinesiology from Colorado Mesa University and a Certified Personal Trainer credential, he analyzes active ingredients in protein powders, pre-workout formulas, and muscle recovery vitamins. Zayden tests sports supplements to provide honest product reviews for active individuals.

How we work Full methodology ›

We do not run a lab. What we do is read every Supplement Facts panel and certificate of analysis in a category, put the numbers in the same units, and have a second reviewer check the dose and interaction claims against published research before publication.

Step 1 Sweep the category Every current product with a readable Supplement Facts panel goes into the sheet, not just the popular ones.
Step 2 Normalize the numbers Active nutrient per serving and per dollar, so labels stop being able to hide behind serving sizes.
Step 3 Check the certificates USP, NSF, and third-party test results are noted per lot where published, and flagged where they are not.
Step 4 Second review A researcher on the team checks every dose, interaction, and safety claim against published literature before publication.
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