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10.1289/ehp.8483

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

Many bodybuilders consider themselves on par with lab rats, says Rick Collins, a criminal defense attorney who specializes in cases involving steroids and dietary supplements

The median sample size across these studies was 23 patients (interquartile range (IQR): 6.338.5, average: 23, range: 342), with a median age of 36.9 years (IQR: 35.637)