Data you can cite
The first five pages end with a “Using this data” block: a suggested citation line with the page title, address and as-of date, how often we update it, and how to reach us.
- Longevity gear price tracker: dated US prices for the reviewed products, how prices changed between readings, and sale prices against the maker’s printed regular price. The full log is one file, price-log.csv.
- What a home sauna costs to own over three years: a table of sauna session and monthly electricity costs by state, built from the US Energy Information Administration’s state prices and the wattages makers state.
- How much does a cold plunge cost to buy and run?: the same kind of state table for the chillers whose makers publish a wattage.
- Red light therapy: FDA cleared or only registered?: what FDA’s 510(k), registration and listing, and AccessGUDID records show for 18 red light devices, set beside what each brand says.
- Longevity gear recalls and CPSC warnings: CPSC recalls and warnings for sauna blankets, saunas and walking pads with the model numbers, dates, units, hazards and remedies, plus a CPSC and FDA check of every brand we review, dated Nov 7, 2026.
- Black Friday 2026 deals: sale prices read on the makers’ own US stores, with the regular price and end date where the maker prints them.
How the data is made
Prices are US dollars, read from the maker’s own page (or a named authorised retailer) before tax and shipping, and dated. A fact we could not confirm is shown as unknown, never as zero or a guess. Sale prices are labeled as sale prices, and coupon and member prices are not counted.
Each buying guide explains how products were chosen, and the evidence reviews explain how a claim is graded:
- How we rate the evidence
- How we choose home saunas, red light devices, sleep gear, wearables, water filters and lab tests
- Evidence reviews: what studies found, in whom, and how certain it is
Editorial policy, funding and corrections
The editorial policy says how reviews are researched and written. How we make money explains our affiliate links, which are disclosed and marked as sponsored, and says we take no paid placements. The site is edited by Porsche Ma; see about the founder and about Biology Verdict.
If you find a mistake, the corrections page says how to report it and lists the changes we have made to facts already on the site.
What to keep in mind
Prices change, so a figure is true on its date and may not be today. The reviews are general information, not medical advice, and we can’t give personal medical advice. Our terms of use let you link to any page and quote short passages with a link back. They don’t allow republishing whole pages or copying the site’s content in bulk, and we haven’t set a separate licence for the data, so please credit Biology Verdict and link the page.
Contact
Write to hello@biologyverdict.com, the address on our contact page. Say what you are working on and the date you need an answer by, and we will reply as soon as we can.
Last updated . Questions about this page? Contact us.