Vitamin K1
Blood health and bone support.
Dose & timing
- 1.5 mg — daily
Why it appeared in the archived stack
Phytomenadione, the dietary K form. Coagulation cofactor and substrate for bone osteocalcin. 1.5 mg is well above the RDA (120 mcg) but matches intakes seen in green-leafy-heavy diets. Bryan stacks K1 + K2-MK4 + K2-MK7 because they have different tissue distributions.
Caveats
- Interacts with anticoagulants (warfarin, acenocoumarol). If you take blood thinners, talk to your doctor before starting any K supplement — even small dose changes can shift INR.
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 — 32,90 zł |
Related supplements
FAQ
Where can I buy Vitamin K1?
Vitamin K1 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 K1 appeared in the January 2024 protocol?
1.5 mg — daily.
Why did Vitamin K1 appear in the archived stack?
Phytomenadione, the dietary K form. Coagulation cofactor and substrate for bone osteocalcin. 1.5 mg is well above the RDA (120 mcg) but matches intakes seen in green-leafy-heavy diets. Bryan stacks K1 + K2-MK4 + K2-MK7 because they have different tissue distributions.