Circulation 129 (25 Suppl 2), S102S138
Vitamin B12 supplements can help treat or prevent a vitamin B12 deficiency, which can be serious and Not everyone needs to take a vitamin B12 supplement, as However, healthcare professionals may recommend vitamin B12 supplements for certain populations, including: people following a vegan diet older adults people who have had gastrointestinal surgery people who have nutrient absorption issues people with dietary restrictions People taking certain long-term medications, such as metformin and proton pump inhibitors, may also benefit from a supplement, as these medications can affect absorption of vitamin B12
(PubMed) Desmond MA, Sobiecki JG, Jaworski M, et al
Severe allergic reactions, persistent swelling, and significant changes in energy levels or mood should not be ignored
Other populations at risk include people who had gastrointestinal surgery (including weight loss surgery) and diseases that affect the gut, such as Crohn's disease or celiac disease