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HGH Frag 176-191 EssentiaPeptides provides high-purity, lab-tested peptides for experimental studies on fat loss, metabolic pathways, and growth hormone-related research.

PMID 2546112

My guess still remains that there's been an error in the process somewhere and it's 'crept out'

Peptide degradation pathways Tirzepatide is a 39-amino-acid peptide with specific structural modifications that make it effective, including alpha-aminoisobutyric acid (Aib) substitutions at positions 2 and 13 (which protect against DPP-4 enzyme degradation in the body) and a C20 fatty diacid chain at position 20 (which enables albumin binding for a longer half-life)