Signs You May Have a B12 Deficiency B12 deficiency can cause a variety of symptoms, including fatigue, headaches, depression, pale or yellow skin, mental impairment, and pain and inflammation of the mouth and tongue
Post-Injection Care You may experience a mild tingling or warmth at the injection site, but side effects are rare
Allergic reactions are possible, though infrequent
Anti-Doping Agency (USADA) because of its potential to enhance recovery, endurance, and athletic performance (1)
Conflict of interest The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest
Vitamin B12 (cyanocobalamin) is unique it is the only one that contains the mineral cobalt