Can Peptides Cause Cancer? What the Research Shows

One of the most common questions we hear is whether peptides can cause cancer. Growth hormone–releasing peptides (for example, CJC‑1295, Ipamorelin, Tesamorelin) can raise IGF‑1 levels. To date, there is no clear evidence from clinical studies that therapeutic peptide use causes or accelerates cancer. Many peptides used clinically (such as BPC‑157, TB‑500, and GHK‑Cu) have been shown in research to reduce inflammation, protect DNA from oxidative stress, and support immune regulation—effects that may improve the cellular environment and resilience. At Extension Health we take a personalized approach to peptide therapy, tailoring protocols to each patient’s health history, risk profile, and goals.