vitamin b12 injection what does it do shot How Often Can You Get

European Journal of Clinical Nutrition , 68 (5), 541548

Many sublingual supplements provide between 1,000 mcg and 5,000 mcg per serving, although the appropriate amount depends on individual needs and should follow the product label or your healthcare provider's guidance

Have had a stomach or intestinal surgery, including weight loss surgery that removes part of the stomach or intestine (i.e., sleeve gastrectomy or gastric bypass)

Side Effects, Risks & Regulatory Notes Most people tolerate vitamin B12 injections well, but injection-site soreness, transient swelling, or redness can occur

A pharmacokinetic study in rats found that oral administration produced substantial plasma concentrations, with a maximum concentration of 2252 ng/mL and an elimination half-life of approximately 6.9 hours

Over time, that can mean thicker, healthier strands