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they're unregulated, potentially impure, and lack dosage precision, posing health risks like bacterial contamination or heavy metals.[44][45][46] Unregulated online sources amplify dangers with potential counterfeits, unknown additives, or legal violations, as they're not FDA-approved and may lead to adverse effects or inefficacy.[47][48][49] Prioritize compounding pharmacies for reliable, compliant options
Endotoxin testing confirms bacterial contamination remains below safety thresholds
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Tumor markers like PSA, CA-125, or CEA may be worth checking in individuals with relevant risk factors, though their usefulness for screening in healthy individuals remains debated
By this potential mechanism, GHK-Cu peptide may restore impaired cells, including carcinogenic cells and COPD cells
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