Peptides sold for muscle growth, such as BPC-157, CJC-1295 and ipamorelin, are not approved for that use in New Zealand. Medsafe says many are prescription medicines and warns they are illegal to sell outside the regulated system. If you compete, many are also banned in sport.
What does Medsafe say?
Medsafe’s 2026 advisory names BPC-157, CJC-1295, GHRP-6, ipamorelin and TB-500, among others, as products commonly advertised online. It says none are approved in New Zealand and it has not assessed them for quality, safety or efficacy.
It also says that if a product is offered for personal use or injection, it is being supplied unlawfully.
Are peptides banned in sport?
If you compete, this may matter more than anything else. The WADA Prohibited List covers peptide hormones and growth factors, and has a separate category for non-approved substances. A positive test can follow even if you bought a product believing it was allowed.
| Peptide | NZ approval for muscle | Check in sport |
|---|---|---|
| BPC-157 | No | Check WADA list |
| TB-500 | No | Check WADA list |
| CJC-1295 | No | Check WADA list |
| Ipamorelin | No | Check WADA list |
Is there good evidence for muscle gain?
We found no strong human evidence that makes these products a proven route to muscle. Sellers often quote lab or animal work, which does not show what happens in a person. That gap is why claims online sound stronger than the science.
What should you do instead?
Keep to what is established: progressive training, enough protein and sleep. If you are thinking about any injectable, talk to your GP first. They can also check whether symptoms such as fatigue or low energy have a medical cause.
Where do skincare peptides fit in?
They do not affect muscle. They are a skincare step, and a simple post-gym routine is the most useful place for them. For the wider picture, read peptides in NZ.
Common questions
Are peptides banned in sport?
Many are. The World Anti-Doping Agency's Prohibited List covers peptide hormones and growth factors, along with non-approved substances. If you are tested, check every product against the current list before you use it.
What actually helps muscle growth?
Progressive training, enough protein and calories, and sleep are the established basics. A doctor or registered dietitian can help if you have a health condition or are thinking about supplements.