NHS information also lists effects such as nausea, diarrhoea, headache and dizziness
Most people notice that any visible results in the first month are generally modest, and are closely linked to lifestyle improvements rather than the injections alone
The Institute of Medicine reports that no adverse effects have been associated with excess vitamin B12 intake from food and supplements in healthy individuals. However, if youre not deficient in vitamin B12 to begin with or you dont address the underlying reasons you might be deficient, injections likely wont do much to improve overall quality of life
This makes the homocysteine level a useful but non-specific test, which tells me how the methylation cycle is working
[1] It is used as a diluent to dissolve or dilute medications for intravenous (IV), intramuscular (IM), or subcutaneous (SQ) injection according to the instructions of the specific drug being prepared