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PMID: 11087911

(5) IIRI + MET + Abx group: administered oral antibiotics (ampicillin 1 g/L, neomycin 1 g/L, metronidazole 1 g/L, and gentamicin 160 mg/L) combined with metformin in drinking water for one week prior to IIRI

Endotoxin Testing per USP Bacterial endotoxin is screened on every released lot using the LAL method described in USP

10.1093/hmg/ddq430 Hum

"FDA updates on bulk drug substances nominated for use in compounding." FDA.gov, updated communications 2023

While the FDA has noted concerns about things like impurities in some compounded peptides, this highlights the risk of sourcing them from unreliable online vendors, not the peptides themselves