Useful before impressive.
These are the rules we hold ourselves to. They are written down so you can hold us to them, and so a page that breaks one is visibly wrong rather than a matter of taste.
The test every page has to pass
Before anything is published it has to do at least one of three things: help you understand a decision you are actually facing, give you an action you can repeat, or protect you from a claim that would have misled you.
Content that exists to fill a publishing calendar fails this test. So does content that is technically accurate but leaves you with nothing to do.
Sourcing
- Claims are traced to primary research or to a guideline body, not to another article that cited one.
- Where a claim rests on a single study, the page says so.
- Animal and cell studies are labelled as such and are never written up as human advice.
- A finding in one population is not silently generalised to another. Who was studied is stated.
- If we cannot source a claim, we cut it rather than soften it.
Evidence and uncertainty
Every research brief carries a strength rating on a published four-point scale, and the rating is derived from the state of the research rather than from how interesting the finding is.
Uncertainty is a field on the page, not a caveat buried in the last paragraph. If the honest answer is "nobody knows yet", that is the answer we publish.
Authorship and review
Everything is bylined "The Endurvity Team". We do not invent authors, and we do not attach credentials to a byline that has not earned them here.
Every substantial page carries the date it was last reviewed. A review date means a person checked the page against current evidence on that date — it does not, today, mean an external clinician signed it off, and no page claims that it does.
Language we do not use
Some phrasing is disqualifying regardless of what surrounds it, because it sets an expectation the evidence cannot meet.
- "Reverse your biological age" and every variant of it.
- "Unlock", "hack", "optimize" used as substitutes for a specific claim.
- Miracle, breakthrough, and secret, applied to anything.
- Fear framing — describing a normal age-related change as a catastrophe to make an action feel urgent.
- Hyper-masculine framing that treats capability as dominance.
Tools
A tool that returns a number has to publish what it measures, what it assumes about the person using it, and where its answer stops being reliable. Those three disclosures appear on the tool page itself, not in a footnote.
Tools are free and do not require an account. Where a tool stores anything, the page says what and where.
Corrections
We will get things wrong. When we do, the page is corrected, the correction is described rather than quietly patched, and the change is logged.
Substantive corrections — anything that changes what a reader would do — are noted on the page itself as well as in the log.
Commercial relationships
Endurvity currently takes no advertising, affiliate revenue, or sponsorship, and sells nothing. No recommendation on the site is paid for.
If a commercial relationship is ever introduced, it will be disclosed on this page and at the top of any page it touches, before publication rather than after.
Last reviewed June 2026 · Reviewed at least twice a year