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Many people experience B12 deficiency due to dietary restrictions, medical conditions, or lifestyle factors, making supplementation through injections an excellent option

The contents of the letter should include an explanation of the diagnosis that requires the vitamin or supplement, says Nielsen

WADA states that the 2026 Prohibited List includes peptide hormones, growth factors, related substances, and mimetics in a high-sensitivity category, and USADA materials explain that hCG carries restrictions in male sport settings

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