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Even medically supervised use may not protect an athlete from anti-doping consequences if a substance is prohibited under their sports rules

Been using the product for almost a month

B12 injections are also used to treat people with malabsorption (gastrointestinal conditions that prevent proper absorption of B12 from the gut), for example, people with atrophic gastritis (stomach inflammation) and intrinsic factor deficiency (pernicious anemia) or those who have undergone surgical procedures such as gastrectomy or small bowel resection (stomach or intestine removed), autoimmune diseases, etc

This is rare, so you have little to worry about