What They Are. Why They Work. Why GANDER. Peptides are short chains of amino acids — your body’s natural building blocks for recovery, regeneration, healing and performance. They’re smaller than proteins, more targeted, and deliver results fast… which is why people use them for fat loss, muscle growth, anti-ageing, gut repair, sleep, mood and overall optimisation. Shorter chains are called oligopeptides (under ±10–15 amino acids). Longer chains (up to ±50) are polypeptides. Anything above that becomes a full protein. Basic biochemistry — powerful outcomes.When amino acids link together, water is released and each amino acid becomes a residue. Every peptide (except cyclic ones) has two ends: N-terminal: amine group C-terminal: carboxyl group. That’s the science in simple terms.