Vastkind publishes explanatory articles on new research and developments in AI, biotech, longevity, and software security. Each issue unpacks a single recent study or event, stating what was and was not shown.

Dokter Servaas' Spreekuur is een Belgische gezondheidsnieuwsbrief die medische onderwerpen in begrijpelijke taal uitlegt, met aandacht voor wetenschappelijke onzekerheid. De uitgaven in de sample behandelen het 5R-darmprotocol, het verschil tussen oordelen en feiten bij lichaamsgericht werk, en de vraag of metformine een anti-aging middel is.

Weekly Spanish-language newsletter that examines the health and longevity protocols of public figures such as Peter Attia, Bryan Johnson and Andrew Huberman. Each issue separates what has solid evidence from what is still experimental.

A newsletter from a former New York Times journalist and health coach covering strength training, nutrition and longevity, with video demonstrations, recipes and commentary on health information. Readers get critical takes on fitness and longevity claims, quick whole-food recipe videos, and occasional audiocasts.