How We Research & Score Products

The single highest-weighted criterion because supplement marketing consistently overstates evidence. We assess the research base on four dimensions:

• Study design: Randomized controlled trials (RCTs) carry the most weight. Observational studies, case reports, and in-vitro data can support but not establish efficacy claims.
• Effect size: Statistical significance alone is insufficient. We note practical effect sizes and whether they are clinically meaningful.
• Replication: A finding from a single lab or industry-funded study scores lower than findings replicated across independent groups.
• Population fit: We flag when evidence comes primarily from clinical populations (e.g., elderly, diseased) and may not generalize to healthy active adults.

Sources used: PubMed, Examine.com, Cochrane Reviews, and published systematic reviews and meta-analyses.

A product cannot earn trust without full formula disclosure. We evaluate:

• No proprietary blends: Products hiding individual ingredient doses behind a blend name score 0 on this criterion unless they also publish independent lab verification.
• Clinical dosing: Ingredients present at sub-clinical doses — below the amounts used in the supporting studies — receive a penalty proportional to the gap.
• Label accuracy: Third-party certificate of analysis (COA) availability improves confidence that labeled amounts match actual contents.
• Filler and allergen disclosure: Unnecessary additives that contribute no benefit (artificial dyes, fillers present for manufacturing convenience) lower the score.

We calculate cost per serving and compare it against at least two to three competing products with similar formulations and certifications. Premium pricing is acceptable when justified by:

• Patented, standardized, or certified ingredient forms (e.g., KSM-66, Wellmune WGP, Creatine Monohydrate vs. creatine HCl at equivalent doses)
• Third-party certification overhead (NSF, Informed Sport)
• Responsible manufacturing standards (cGMP, FDA-registered facility)

Products where the price premium is driven primarily by branding, celebrity endorsement, or aggressive marketing score lower on Value regardless of other merits.

Peer-reviewed evidence tells us what should happen; real-world signals tell us what does happen under typical conditions. We synthesize:

• Long-form verified-purchase reviews (Amazon, brand sites, Reddit communities)
• Documented user reports covering ≥4 weeks of use
• Published third-party hands-on testing where available

We do not conduct in-house lab testing. We are transparent about the basis for each assessment. Where real-world data conflicts with the published evidence, we note the discrepancy and explain likely causes (compliance, dosing, population differences).

Independent certification provides an accountability layer that the supplement industry otherwise lacks. Certifications we recognize:

• NSF Certified for Sport — tests for banned substances and label accuracy; required for many professional athletes
• Informed Sport / Informed Choice — batch-tested for WADA-prohibited substances
• USP Verified — independent testing for ingredient identity, potency, purity, and dissolution
• Labdoor — third-party lab testing with published grade reports

Absence of certification does not automatically lower a score to zero — many excellent products, particularly newer formulations or those from smaller manufacturers, have not pursued certification. However, the 10% weight means certified products will score up to 1 full point higher than uncertified equivalents, all else being equal.