The use of peptides has increased dramatically over the last decade or so as specialized wellness or metabolic treatments.
A peptide is a short chain of amino acids produced naturally in the body. String them together, and you get proteins. Many natural peptides act as signals that tell your cells and organs what to do. They function as hormones, neurotransmitters, and growth regulators. Certain peptides are clinically studied, regulated, and prescribed by doctors to treat specific health conditions.
However, many non-prescription or online "biohacking" injectable peptides are not regulated by health agencies like the US-based Food and Drug Administration. The debate surrounding the use of non-prescription peptides was highlighted in 2025 after the death of actor and Hollywood stuntman Richard Norton, who died after injecting unapproved peptides.
Nevertheless, peptide therapy remains hugely popular among members of the general public and celebrities. In fact, several high-profile actors, entertainers, and influencers admit to using peptides as part of their daily health and beauty routine.
In this gallery, we examine in more detail the function of peptides and profile some well-known names who indulge in peptide therapy.
Continue reading to find out more.