Four of the five warning letters were to companies (specifically, Xcel Research, Prime Vitality, Summit Research Peptides, and Swisschem) that claimed to distribute GLP-1s for research use only in spite of ample evidence to the contrary
PubMed , Molecules (Basel, Switzerland) , vol
The classical pathway is initiated by pathogenic stimuli, which activate pattern recognition receptors (PRRs) along with caspase recruitment domain- or pyrin domain-containing proteins (159, 163)
As interest in peptide therapy for longevity, recovery, and body composition continues heading into 2026, two growth hormone secretagogues appear frequently in consumer research: Ipamorelin and Sermorelin