monitoring may be required Polycythemia vera: Correcting B12 deficiency may unmask underlying polycythemia Masking folate deficiency: B12 supplementation can mask the hematologic signs of folate deficiency while allowing neurological damage to progress Allergic reactions: Rare hypersensitivity reactions have been reported, including anaphylactic shock with cyanocobalamin Common Side Effects Mild diarrhea Injection site reactions: pain, swelling, itching Feeling of generalized body swelling Mild headache Temporary reddish urine (normal B12 is water-soluble and excreted) Seek Medical Attention For Signs of serious allergic reaction: rash, hives, facial swelling, difficulty breathing Chest pain or irregular heartbeat Signs of low potassium: muscle cramps, weakness, irregular heartbeat Vision changes (especially if you have Lebers disease) Drug Interactions Chloramphenicol: May antagonize the hematopoietic response to B12 Metformin, proton pump inhibitors, H2 blockers: Can reduce B12 absorption (these are reasons to use injectable B12 instead of oral) Nitrous oxide: Can inactivate B12 in the body Use in Pregnancy and Breastfeeding B12 is generally considered safe during pregnancy and breastfeeding when used at appropriate doses
Some providers prescribe sub-2.5mg doses for patients who are especially sensitive to GLP-1 receptor agonists, have a history of severe GI side effects, or are transitioning from another medication and need an ultra-gradual introduction
PlexusDx compounded semaglutide injections are $189/mo month-to-month, or from $149/mo on the 6-month plan with no insurance required, making sustained therapy accessible
Individual differences in FTO and MC4R genes also affect satiety signaling and weight regulation mechanisms
The subjects who, at that time, switched from semaglutide 2.4mg to placebo had regained half of that weight after 48 weeks, whereas those who continued on active treatment achieved an additional weight loss of around 8% in the same time period
Li J, Zheng C, Zhang L, Hong C, Liu X, Zhang X, et al
