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In case of an Adverse Analytical Finding (AAF) in-competition, the athlete may apply for a retroactive TUE as provided for in the applicable rules

Impure products can contain: Incomplete synthesis fragments that may cause immune reactions Bacterial endotoxins from contaminated manufacturing Heavy metals from poor quality synthesis reagents Misidentified or substituted peptides entirely Degradation products from improper storage before sale Users who experience unusual or severe side effects should consider source quality as a potential cause

Sources Food sources Only certain bacteria and archaea can synthesize vitamin B 12 (123, 124)

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