They Call It the 'Wolverine Peptide.' And Everyone from Biohackers to Your Dad Wants It Now. Using Peptides for Muscle Growth and Fat Loss: Benefits vs. Risks Transparent Labs Peptides & Cellular Repair: What Research Shows , Peptides are short chains of amino acids that act as biological messengers, helping cells communicate during stress, inflammation, and repair. The peptide problem: Hype is outrunning the evidence