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However, its use is under ethical scrutiny and may violate anti-doping regulations in competitive sports.
Reported side effects are generally mild and include temporary gastrointestinal discomfort, headaches during initial use, occasional fatigue as the body adjusts, and rare nausea, especially when taken without food
Vitamin B12 injections are also used by people with impaired vitamin B12 absorption or deficiency called Pernicious anaemia caused by: Inadequate dietary intake of B12 Loss of gastric parietal cells in chronic atrophic gastritis Structural damage or surgical resection of the small intestine or stomach Long-term use of acid regulating medication Alcoholism Gastric banding surgery Celiacs disease Pernicious anaemia Crohns disease Until now, injection of methyl-B12 has required a needle
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