Vitamin B12 Supplements
Correct B12 deficiency; support energy, nerve function, and red blood cell production
Forms
Cyanocobalamin, methylcobalamin; oral tablets, sublingual, sprays, injections (medical)
Advantages
Very safe with a wide dosing margin; sublingual and methylcobalamin forms bypass some absorption issues
Disadvantages
Oral forms are less effective in people with pernicious anaemia or absorption disorders, who may need injections
Side effects
Very rare; mild acne-like rash reported at high doses in some individuals
Interactions
Metformin and proton pump inhibitors reduce B12 absorption over time
At-risk groups
Vegans and vegetarians, older adults, people on metformin or long-term PPIs, those with pernicious anaemia
Cautions
Test levels before high-dose supplementation if the underlying cause is unclear
Related symptoms
Educational information only — not medical advice. This content does not diagnose, treat, or replace consultation with a qualified healthcare professional. Always seek professional medical advice for symptoms, supplement use, or health concerns.