We don't sell supplements.
We score them.
Independent reviews that score 1462+ products on what actually matters when you buy: the clinical evidence, third-party testing, cost per effective dose, and whether the label tells you the truth.
We may earn a commission on purchases through our links; it never changes a product's score.
How we score →Strongest Evidence
Supplements ranked by the strength of their clinical research. How we rate evidence →
Highest Scored Products
View all →Top-scoring individual products across all supplement categories
Compare Head-to-Head
All comparisons →Same rubric, side by side - so you can see exactly why one wins.
Thorne Magnesium Bisglycinate
Thorne
$0.72/day
Pure Encapsulations Magnesium (Glycinate)
Pure Encapsulations
$0.42/day
Recently Scored
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Kirkland Signature Vitamin D3 50 mcg (2000 IU)
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Extra Strength Vitamin C 1000 mg Tablets
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Ovasitol Inositol Powder, 90-Day Supply (Myo + D-Chiro 40:1)
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Ovasitol Inositol Powder, 90-Day Supply (40:1 Myo + DCI)
Theralogix
Naked Casein
Naked Nutrition
Nature Made Iron 65mg (Ferrous Sulfate)
Nature Made
Nature Made Vitamin D3 50 mcg (2000 IU)
Nature Made
How We Score
Full methodology →Every supplement gets two scores, because there are really two questions: does the ingredient actually work (the evidence tier), and did this brand make a good version of it (the execution score for each product)?
Evidence Rating
Grades the clinical evidence for an ingredient type - independent of any brand. Assigned per meta-analysis and systematic review data.
Multiple large RCTs and meta-analyses confirm benefit
Several RCTs showing benefit, generally consistent results
Limited RCTs or mixed results across studies
Mostly animal or in-vitro studies; human data weak
No meaningful evidence, or evidence shows no benefit
Execution Score /100
Grades each product brand on four equally-weighted pillars. A high-evidence ingredient can still be sold in a poorly-executed product.