About — Who Writes longevity.how

longevity.how is an evidence-based longevity publication. We write in Polish first and translate onward, but the test data is shared — one device, one measurement, six markets.

How we work

Every strong claim links to a source and carries an explicit evidence level, from meta-analyses down to “mice only”. When we don’t know something, we say so — usually the most useful sentence in the piece.

We test hardware for 60–90 days, not a week. A review without flaws is an advert, so we always list the flaws.

How we make money

Affiliate links, labelled on every page where they appear. Commission never changes the verdict, and we buy our own gear — if we ever receive a review unit from a manufacturer, we say so in the article.

Contact

kontakt@longevity.how — corrections welcome. Our corrections policy is described in the testing methodology.

The evidence scale

Every strong claim on this site carries one of six labels: strong evidence, moderate, preliminary, animals only, mechanism only, marketing. The label describes the specific claim rather than the product: creatine has strong evidence for muscle strength and moderate evidence for cognition under sleep deprivation.

The full explanation of the scale, with examples, is in the supplements guide. How those levels turn into instructions is covered in the protocols section.

What we do not do

We do not publish rankings without a methodology. We do not write about products we have not tested as though we had. We do not describe ways of obtaining prescription drugs, and we do not advise on matters that require examining a patient.

We also do not run a daily newsletter or push notifications. One message a week, one-click unsubscribe, as described in the privacy policy.

Reporting errors

If you find a factual error, write to kontakt@longevity.how with a link to the source. We fix it and record the change at the foot of the article, following the corrections policy set out in the testing methodology.