The incidence, however, appears to increase with age
Its effect is specific to adipose tissue metabolism
Pairing the injectable protocol with an understanding of your methylation genes is the test-before-you-invest approach clarity first, commitment second
For people with an absorption problem, injections are usually more effective than tablets
10.1089/acm.2006.12.881 Summary Keywords vitamin B12, efficacy, bioavailability, therapeutic approaches, meta-analysis, cobalamin Citation Mazur M, Ndokaj A, Salerno C, Vallone J, Ardan R, Bietolini S, Carrouel F, Wilk A, Sarig R, Ottolenghi L and Bourgeois D (2025) Efficacy of sublingual and oral vitamin B12 versus intramuscular administration: insights from a systematic review and meta-analysis