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The peptide tier list
Peptides ranked S to F by what has actually been published — not internet hype, influencer claims, or vendor marketing. Tiers come from our Research Maturity Index(a weighted 0–100 evidence score). This ranks evidence, not effectiveness — and popularity never raises a tier.
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Research volume vs evidence
Well-studied & supported
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Lots of attention, thinner evidence
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Under-discussed but supported
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Early / niche
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No compounds match these filters. Reset