Warnings Benzyl Alcohol: Patients who have early Leber's disease (LHON) a hereditary disease that causes optic nerve atrophy have been found to suffer severe and swift optic atrophy when treated with vitamin B12
Natural: Synthetic cyanocobalamin requires conversion in the liver to become active, which means some people may not absorb it efficiently
Common Stomach Side Effects of Vitamin B12 Supplements Although vitamin B12 supplements are generally well-tolerated, some individuals experience gastrointestinal symptoms, particularly when taking oral formulations
Archived from the original on 13 September 2017
Vitamin B12 deficiency in over 16s: diagnosis and management (NG239)
A review of top-ranking med spa websites reveals a consistent set of marketing claims for B12 injections: increased energy, improved mental clarity, enhanced metabolism, support for weight loss, better skin health, and even anti-aging benefits