Vitamin D-3
Bone health, immune function, and hormone regulation.
Dose & timing
- 2,000 IU — daily
Why it appeared in the archived stack
2000 IU/day brings most adults into the 30–50 ng/mL serum 25(OH)D range maintenance studies aim for. Bryan adjusts via blood test — start here, retest in 8–12 weeks. Take with a fat-containing meal.
Where to buy
| United States (Amazon.com) | Buy on Amazon.com ✓ direct ASIN mapped |
| United Kingdom (Amazon.co.uk) | Buy on Amazon.co.uk ✓ direct ASIN mapped |
| Germany (Amazon.de) | Buy on Amazon.de ✓ direct ASIN mapped |
| France (Amazon.fr) | Buy on Amazon.fr ✓ direct ASIN mapped |
| Spain (Amazon.es) | Buy on Amazon.es ✓ direct ASIN mapped |
| Italy (Amazon.it) | Buy on Amazon.it ✓ direct ASIN mapped |
| Poland (Allegro.pl) | Buy on Allegro — 5,45 zł |
Related supplements
FAQ
Where can I buy Vitamin D-3?
Vitamin D-3 is available on Amazon in the US, UK, Germany, France, Spain, Italy and Poland. This page links each marketplace directly — to a mapped product listing where one exists, otherwise to a targeted Amazon search built from the product, dose and brand hint. A mapped ASIN verifies only the link target, not purity, quality, stock or suitability.
What dose of Vitamin D-3 appeared in the January 2024 protocol?
2,000 IU — daily.
Why did Vitamin D-3 appear in the archived stack?
2000 IU/day brings most adults into the 30–50 ng/mL serum 25(OH)D range maintenance studies aim for. Bryan adjusts via blood test — start here, retest in 8–12 weeks. Take with a fat-containing meal.