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[DOI] [PubMed] [Google Scholar] 59.Enebo L.B., Berthelsen K.K., Kankam M., et al

Pharmacokinetic profile: The absolute bioavailability of a metformin 500 mg tablet administered in the fasting state is about 50%-60%

Substituting one form for another should only happen with professional guidance

Context matters enormously

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

Getting an injection of vitamin B12 to ensure you're getting enough of the nutrient could improve your health in several ways