B12 (methylcobalamin)
Nerve health and red blood cell production.
Dose & timing
- 500–1000 mcg — once per week
Why it’s in the 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 on Amazon
| United States (Amazon.com) | Buy on Amazon.com ✓ verified ASIN |
| United Kingdom (Amazon.co.uk) | Buy on Amazon.co.uk ✓ verified ASIN |
| Germany (Amazon.de) | Buy on Amazon.de ✓ verified ASIN |
| France (Amazon.fr) | Buy on Amazon.fr ✓ verified ASIN |
| Spain (Amazon.es) | Buy on Amazon.es ✓ verified ASIN |
| Italy (Amazon.it) | Buy on Amazon.it ✓ verified ASIN |
| Poland (Amazon.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 verified product listing where one exists, otherwise to a targeted Amazon search built from the product, dose and brand hint.
What dose of B12 (methylcobalamin) does the Blueprint protocol use?
500–1000 mcg — once per week.
Why is B12 (methylcobalamin) in the longevity 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.