B12 (methylcobalamin)
Nerve health and red blood cell production.
Dose & timing
- 500–1000 mcg — once per week
Why it appeared in the archived stack
Methylcobalamin is the form active in the central nervous system; converts to adenosylcobalamin in mitochondria. Better-absorbed than cyanocobalamin in older adults whose intrinsic-factor production declines. Once-weekly works because B12 stores in liver for years.
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 — 7,99 zł |
Related supplements
FAQ
Where can I buy B12 (methylcobalamin)?
B12 (methylcobalamin) 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 B12 (methylcobalamin) appeared in the January 2024 protocol?
500–1000 mcg — once per week.
Why did B12 (methylcobalamin) appear in the archived stack?
Methylcobalamin is the form active in the central nervous system; converts to adenosylcobalamin in mitochondria. Better-absorbed than cyanocobalamin in older adults whose intrinsic-factor production declines. Once-weekly works because B12 stores in liver for years.