Growth hormone peptides are often marketed for muscle building, energy, fat loss, and staying youthful. But what are they actually doing inside the body? Dr. Jon Kanevsky says most people should think carefully before taking something that could shift the body’s hormone system off balance. He warns that peptides working at the hormone level come with unanswered questions around cancer risk, kidney injury, and other potential downstream effects. Are the promises of growth hormone peptides worth the serious long-term risks?