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Each decision rolls up every audited claim behind one longevity question — what each creator said, how it stacks up against the literature, and the verdict.
Yes. From whole-food sources. Almost no one in the West hits this; the gap is the single biggest dietary lever.
Promising signal from Stanford's Sonnenburg trial, but the n is small and the effect modest.
For most healthy adults the market outruns the evidence. Strain-specific use cases have data; "general gut health" does not.