Siim Land
Author and YouTuber on fasting, metabolism and longevity
Siim Land is an Estonian author, speaker and YouTuber who writes about fasting, metabolism, supplements and aging. His books include Metabolic Autophagy and The Longevity Leap. He hosts the Siim Land Podcast, runs an online health community, and often tests interventions on himself and shares his blood results. In 2026 he reported ranking first in the Longevity World Cup.
Updated November 1, 2026 · 2 experiments
What Siim Land has tried
2 experiments we can source: 2 kept. Trying something is not recommending it; each entry says which.
Kept
Blood biomarker trackingProcedures
Dates not stated · Recommends it to others
Says he has done hundreds of blood tests and shares which markers he thinks matter; a month earlier he reported ranking first in the Longevity World Cup on blood-based biological age.
Siim Land, After 100s of blood tests, here's what I discovered matters, YouTube (August 2026) · Status checked November 1, 2026 · Suggest a correction
CreatineSupplements
Dates not stated · Does not recommend it to others
Takes it when building muscle or strength and in doses of about 15 g after sleep loss or jet lag, but not every day, because he worries it may blunt VO2 max gains.
Siim Land, This is what happens to your brain on 15g of creatine, YouTube (September 2026) · Status checked November 1, 2026 · Suggest a correction