[1] For licensed B12 medicines, detailed information about side effects can be found in the product's Summary of Product Characteristics (SmPC)
In over 1,000 vitamin B12 shots, Ive never seen anyone have any issues with either, but there is a theoretical risk factor for both
Symptoms that may indicate low Vitamin B levels include fatigue, depression, low blood pressure, constipation, memory loss, weakness, sore tongue, tingling and numbness in fingers and toes, mood changes and difficulty walking
Methionine, Inositol and Choline
[58] Medical uses [edit] Treatment of deficiency [edit] Severe vitamin B 12 deficiency is initially corrected with daily intramuscular injections of 1000 g of the vitamin, followed by maintenance via monthly injections of the same amount or daily oral dosing of 1000 g