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Elevated homocysteine has been associated with skin changes including hyperpigmentation, and some research connects poor methylation status to inflammatory skin conditions

Purity certificates and conspiracy theories A common rejoinder from people buying peptides online is that third-party certificates of analysis show the powder they receive is pure and free of contaminants

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No human clinical trial has validated a dosing range for IGF-1 LR3

Certificate of Analysis (CoA) A legitimate supplier provides batch-specific HPLC and mass spectrometry data confirming purity, typically 98% for research-grade peptide