How Validity works

Validity reports what health and longevity experts actually say, side by side. We do not decide who is right — we show you where they agree, where they differ on protocol, and where they genuinely disagree, with a receipt for every position.

The pipeline

1. Ingest. We listen to each expert's own podcast feed (and their books and articles). We work from open RSS feeds only — we do not scrape video platforms.
2. Extract. Software finds the concrete positions an expert takes and writes a short paraphrase — thirty words or fewer, always in our own words, never a quote. Raw transcripts are deleted within thirty days.
3. Classify. For each topic we compare experts pairwise into three buckets: common ground, different approaches (same direction, different protocol or dose), and genuine disagreement. A dose-only difference is never called a disagreement — that rule is enforced in code.
4. Audit. Every extraction faces a faithfulness check, deterministic study-reference checks, and a re-check of its classification. Uncertain items go to a human review queue before they publish, plus a random sample of items that look fine.

Report, don't judge

We never say whether a claim is true, whether an intervention works, or whether a study is good. We never grade studies and we never score experts. When evaluation matters, we attribute it to named third parties — Validity itself holds no opinion.

Who we cover — roster criteria

• US-based voices (rare exceptions are logged and disclosed);
• a substantial public body of work on health or longevity, reachable through their own podcast feed, books, or articles;
• actively publishing, so positions stay current;
• we describe people neutrally — names and their public roles, never titles or credentials.

Sources and fair use

Every position links back to its source at the exact timestamp — we want you to click through and listen to the original. We publish short paraphrases, never transcripts or quotes, and we delete raw working transcripts on a schedule. Validity is a cross-expert reference, not a substitute for any expert's own work.

The money promise

No ads. No affiliate links. No sponsorships. No third-party tracking pixels. Validity is not affiliated with, endorsed by, or sponsored by any expert we cover. We accept no money from them and pay them nothing. The only money in the product is the subscription you choose to pay us. Analytics are first-party and self-hosted.

Corrections

If we got something wrong, we want to know — see the errata page and correction channel.

Validity is not medical advice.