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Evidence
Evidence level
Evidence level - How well a claim is backed by studies. Data from large human trials carry more weight than animal or lab work or mere anecdotes.
Also called level of evidenceevidence gradestrength of evidence
The evidence level describes how robustly a claim is scientifically supported. Roughly from strong to weak: large randomized human trials (studies in people where participants are randomly assigned to different groups) > small human trials > animal studies > lab work (in vitro, meaning experiments done in test tubes or on cell cultures, not in living organisms) > single case/anecdotal reports.
Think of it like witness testimony: a single anecdote is like one person's account, while a large repeated study is like video footage from multiple camera angles.
Why the distinction matters
Much of what circulates about peptides rests on animal or lab findings or anecdotes. That is not the same as a proven effect in humans. A high evidence level means: repeatedly tested, with a comparison group (e.g., placebo), and confirmed in people.
On Peptipedia
Entries deliberately state the evidence level so a strong finding isn't confused with a hope.