Take-home message: - Peptides and assorted experimental drugs, like TB-500 and MK-677, are being recommended by fitness influencers to grow bigger muscles, lose fat, and recover from injuries faster - These drugs, many of which are claimed to boost levels of growth hormone, were studied in rodents and very small groups of human volunteers before being abandoned for not being beneficial or for causing unacceptable side effects - They are banned by the World Anti-Doping Agency and appear to be illegal in Canada and the United States, but can be purchased online
In vitro and preclinical studies indicate that cagrilintide retains high potency across amylin and calcitonin receptor subtypes and demonstrates additive pharmacodynamic effects when combined with GLP-1 agonists like semaglutide (DAscanio et al
While agonist peptides based on either scaffold are potent in rat obesity models 2,10,11,12,13 , only a transient weight loss effect is observed with sCT in mouse diet-induced obesity (DIO) models 14 , indicating that there may be distinctions in the mode of action of individual dual agonists
Therapeutic use of oral BPC-157 focuses on comprehensive gut health optimization, treatment of various digestive disorders, support for leaky gut syndrome, and systemic healing enhancement
This failure is predominantly attributed to the limitations of animal models in accurately representing human physiology during preclinical evaluations (211)
