How Longevindex rates evidence
Longevindex is an independent biohacking and longevity reference published by Reo Tuku Iho Limited, a company registered in New Zealand. The site is written for a global audience. Reo Tuku Iho Limited is not a clinic, laboratory, or licensed healthcare provider, and nothing here is medical advice. Read the health disclaimer.
What a guide is
Each guide answers one question — a dose, a comparison, or a protocol — then states what the research supports, where it stops, and which equipment is worth buying when a product actually helps. Guides are free to read. The opening paragraph is the direct answer. The rest of the page is the evidence, the limits, and the related reading.
Evidence ratings
Ratings sit next to the claim they describe. A single guide can use more than one.
- Strong evidence. Repeated human trials or large observational datasets, consistent enough to act on for the people the studies actually included.
- Moderate evidence. Human data exists, but it is narrower: fewer trials, short follow-up, or a specific population.
- Emerging research. Early human data, strong animal data, or a plausible mechanism without a settled outcome.
- Anecdotal. Practitioner or community practice without trials we would rely on.
A podcast mention, a founder protocol, or a product page is not a trial. When a guide cites a paper, book, or official spec sheet, the source list is at the bottom of that guide.
Retailer ratings
Star counts on equipment pages are retailer review totals, usually from the Amazon listing. They are not reviews collected by Longevindex. Our editorial notes are the written overview, benefits, risks, and the short cited summaries on the page. Those retailer stars are not submitted to search engines as our rating.
Amazon Associates
Reo Tuku Iho Limited is an Amazon Associate. If you buy through an Amazon link on this site, we may earn a commission. That commission does not buy a placement. Equipment is included when a guide needs a concrete product, and left off when there is no Amazon listing worth sending you to. Details are in the affiliate disclosure.
Updates and contact
Every guide and equipment page shows the date it was last revised. Doses, prices, and device specs change. If something looks stale, email hello@longevindex.com.