PHM 27 (human) TFA is primarily used in biomedical research for studying neuropeptide function and regulation. It serves as a stable analog of the naturally occurring peptide PHI (Peptide Histidine Isoleucine), making it valuable in investigations related to gastrointestinal physiology and neuroendocrine signaling. Researchers use this compound to explore the role of PHM/PHI in smooth muscle relaxation, intestinal secretion, and modulation of neurotransmitter release. Due to its enhanced stability conferred by the TFA salt form, it is suitable for in vitro assays and in vivo studies where peptide degradation is a concern. It is also employed in receptor binding studies to characterize VPAC receptor subtypes, which are involved in immune regulation and metabolic processes.