(research articles with TLDRs are at the end of this document)
- Get at least 30 minutes of summer sun (or "equivalent") each day, without sunscreen**, to allow the body to produce proper levels of Vitamin D and other chemicals (nitric oxide/etc) naturally.
- If must supplement, get at least 5,000 IU/day, combine with K2 to prevent calcium accumulation in the blood, and consume with a fat to ensure proper absorption.
- Target: 50-75ng/ml blood level.
- We don't need to worry much about overdosing on D3
- No LD50 (median lethal dose) has been calculated for humans but researchers use dog values as estimates, which means we would need to take 3,500 50,000IU capsules within 24 hours to have a 50% chance of dying.