whats better b12 injections or pills Are Vitamin Shots Right for You? Vitamin B12 Tablets vs Injection
Description
Literature Search Strategy A systematic search was initiated on the sixth of January 2020 using the PubMed database

It is less efficient for MTHFR variant carriers

Pan Afr Med J 2018;30:152

However, noticeable effects like improved sleep typically appear within 1-2 weeks, while body composition changes usually become apparent around weeks 6-8
