Supplement Brand Comparisons: Head-to-Head Science Reviews 2026
⚖️ Brand vs brand science
Supplement Comparisons: Ingredient-by-Ingredient Analysis
Choosing between supplement brands requires more than reading marketing claims. Our comparison reviews go ingredient by ingredient — verifying doses, checking third-party testing status, comparing cost per gram of active ingredient, and assessing whether the science matches what
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Label transparency required
Clinical
Dose verification
The science behind this category
Choosing between supplement brands requires more than reading marketing claims. Our comparison reviews go ingredient by ingredient — verifying doses, checking third-party testing status, comparing cost per gram of active ingredient, and assessing whether the science matches what the label promises. We have no brand sponsorships, so we call it as the evidence shows.
All reviews in this category
Every article cites peer-reviewed primary sources. Last updated July 2026.
Frequently asked questions
How do you compare supplements fairly?
We evaluate on five criteria: (1) ingredient transparency — full disclosure of all doses, no proprietary blends; (2) clinical dosing — each active ingredient verified against published research; (3) third-party testing — NSF, Informed Choice, or Labdoor certification; (4) cost per gram of active ingredient — not total product cost; (5) manufacturing quality — GMP certification and FDA-registered facility.
Which supplement brands have the most clinical evidence?
Transparent Labs and Legion Athletics are among the most transparent mainstream brands — both provide full ingredient disclosure and use clinically-studied doses. Momentous (NSF Certified for Sport) and Thorne (NSF certified) are best for third-party testing standards. AG1 has the most clinical trials as a product but uses proprietary blends for most of its formula.
What is third-party testing and why does it matter?
Third-party testing means an independent laboratory (not the manufacturer) verifies that the product contains what the label claims, in the stated amounts, without prohibited substances or harmful contaminants. NSF Certified for Sport and Informed Choice are the gold standard certifications for athletes. Without independent testing, you have no way to verify label accuracy.
Start with our top-rated review
See our full ingredient-by-ingredient breakdown of Transparent Labs vs Legion — the two most popular transparent supplement brands.
Read the full comparison →
