Evidence level A
Level A describes a comparatively strong human evidence base for this exact question; read the conclusion for whether the result is positive, null or bounded.
CELLIVITY RESEARCH
Confidence is
earned in layers.
The library uses five clear confidence bands instead of an academic-looking score. Each band describes the quality of human research for a specific question — not a guarantee for every person.
Evidence level B
Level B describes a substantial but bounded human evidence base for this exact question; read the conclusion for whether the result is positive, null or bounded.
Evidence level C
Level C describes limited, mixed or context-dependent human evidence for this exact question; read the conclusion for direction and limits.
Evidence level D
Level D describes sparse or indirect human evidence for this exact question; read the conclusion for direction and limits.
Evidence level E
Level E marks a central question without dependable direct human evidence; read the outcome conclusion rather than treating the letter as a direction of effect.
01 — Question
Ask what it is meant to do
“Supports strength in older adults” and “extends lifespan” are completely different questions.
02 — Evidence
Start with human outcomes
Controlled trials, useful populations and changes people can actually feel or measure carry more weight.
03 — Limits
Look for what is missing
Small samples, short duration, conflicts and results that have not repeated all reduce confidence.
04 — Review
Keep the answer current
Every guide has a review date and changes when better evidence arrives.
The Science Library helps people understand emerging ideas without turning every promising study into a product promise.