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The Journal of Clinical Endocrinology & Metabolism , 70 (4), 975982

What a COA (Certificate of Analysis) Should Include Identity Confirmation Mass spectrometry confirming the 9,111 Da molecular weight (70 amino acids total with the N-terminal extension) Amino acid sequence verification matching the LR3 modification (Arg at position 3, MFPAMPLSSLFVN extension) Purity Testing HPLC purity look for 98%+ purity The chromatogram should show a single dominant peak with minimal truncated-sequence or oxidized impurities Contamination Testing Endotoxin levels (critical this is injected intramuscular or subcutaneous) Residual solvent analysis Heavy metals screening Protein-Specific Tests (rare but ideal) Circular dichroism (CD) spectroscopy confirming secondary structure Bioactivity assay on MCF-7 or similar IGF-1-responsive cell line Most vendors skip the last category

S., Leissing, T

They also assume that the effects from the trials which were on adults with obesity, type 2 diabetes, or established cardiovascular or kidney disease also apply to healthier adults

Read about peptide expiration and storage safety