injectable b12 side effects Vitamin Effects: How Much is Too Much? Vitamin B12 Side Effects

(PubMed) Lahner E, Persechino S, Annibale B

For people with cobalt allergy (which is more common among people with nickel allergy) who are also at risk of vitamin B12 deficiency, the "general advice seems to be 'take just enough but not too much,' which isn't too different from dosing advice for all vitamins and drugs" (via ACSH)

Each 10 mL multi-dose vial contains 100 mcg/mL of Vitamin B12, equivalent to ten 1 mL weekly injections, making it a convenient and cost-effective option for patients requiring regular supplementation

Your body is adapting to the peptide, fat mobilization is increasing, but visible changes take time

At first, you might need shots more often