Inside the growing market for peptides amid concerns over safety

Over the past two years, injectable peptides have been widely advertised online for their fitness, recovery and cosmetic benefits. While some fitness professionals and influencers claim these substances are safe and beneficial, medical experts are skeptical, citing a lack of scientific evidence to support the claims. In Ireland, Prime Time discovered that peptides marketed as “not for human consumption” are being sold on a grey market.

Four peptide products purchased from suppliers in the Irish market were found to contain significant impurities, according to independent laboratory testing conducted at Maynooth University. One sample of Melanotan, a substance marketed for tanning, contained only 40% of the advertised peptide, while the other three samples contained substantially less powder than advertised.

All four samples also contained an undisclosed bulking agent. The findings raise questions about the safety and effectiveness of the products being sold in this emerging market, many of which have not undergone controlled human trials. The Health Products Regulatory Authority (HPRA) has warned against using injectable substances purchased from unregulated sellers, citing the risks of infection, contamination and dosage errors.

Peptides, a broad term encompassing a wide range of substances, include established medicines such as GLP-1 drugs and unapproved drugs with promising trial results. However, the market for injectable wellness and fitness peptides, produced by unregulated manufacturers often in China, operates in a legal gray area. Despite the scientific uncertainty, these substances have gained popularity among fitness enthusiasts and those seeking improvements in health and appearance.

Prime Time interviewed Neil Rennie, a bodybuilder who injects peptides to aid with injuries, recovery and even for stage performances. Rennie and his partner, champion bodybuilder Nikki Beattie, believe the peptides have reduced inflammation and improved skin. However, they acknowledge the grey area surrounding the safety and efficacy of these substances.