Lately, I’ve been getting asked about peptides almost daily. Over the past few weeks, the interest has skyrocketed—across all ages and demographics. From weight loss to skin health to injury recovery, peptides are quickly becoming one of the most talked-about topics in health and wellness.
So what exactly are peptides? At their core, peptides are short chains of amino acids—the building blocks of protein. Think of them as messengers in the body. They send signals that can tell your body to reduce inflammation, trigger healing, increase collagen production, balance blood sugar, support the immune system, and more.
Peptides are not new to medicine. In fact, some of our most important therapies are peptides. insulin is one of the most well-known examples, and modern metabolic medications like GLP-1 receptor agonists have transformed how we treat diabetes and obesity. There are also many naturally occurring peptides in the human body that play essential roles in everyday health.
What’s changed is the growing popularity of newer peptides being marketed for weight loss, reducing inflammation, healing joint and connective tissue, and improving skin and appearance.
One peptide that comes up often is BPC-157 (Body Protection Compound-157). It is a synthetic peptide derived from a protein found in gastric juice. Most of the research we have so far is preclinical—meaning animal and laboratory studies. These studies suggest it may support tissue repair, promote new blood vessel formation (angiogenesis), and help regulate inflammation. There is particular interest in its effects on tendon-to-bone healing, gut lining repair, and even potential neuroprotective effects. Mechanistically, it appears to influence nitric oxide pathways, growth factors, and vascular integrity. However, there are no high-quality human trials, no standardized dosing, and no long-term safety data. At this point, its use remains experimental and unregulated.
Copper peptides are another commonly discussed group, especially GHK-Cu (glycyl-L-histidyl-L-lysine copper complex). These peptides have a longer track record in skincare and cosmetic science. They occur naturally in the body and tend to decline with age, which has sparked interest in their role in aging and tissue repair. Topically, they may help stimulate collagen production, support wound healing, and reduce inflammation. Some small human studies and cosmetic data show improvements in skin elasticity and healing. However, injectable or systemic use is not approved, and we still lack strong clinical trials in those areas.
A quick but important note on “reta,” or retatrutide—a newer weight loss peptide that is currently circulating online. While early data looks promising, it is not yet approved by Health Canada or other major regulatory bodies. In practice, we also see that compounded GLP-1–type products are often less consistent and less effective than commercially manufactured versions. If you are exploring this space, approved options like tirzepatide (Zepbound/Mounjaro) through a prescribing physician are a far safer and more reliable choice.
From a clinical and safety perspective, peptides should be approached with caution and always under the guidance of a knowledgeable healthcare provider. While it is possible to purchase peptides online, I strongly advise against it. Peptides are proteins, and proteins carry a higher risk of endotoxin contamination. Endotoxins are bacterial byproducts that can trigger significant systemic reactions—and I have unfortunately seen patients become quite ill from contaminated products sourced on the black market.
There are regulated compounding pharmacies that can prepare certain peptides with proper quality control, sterility, and dosing accuracy. While these options may be more expensive, they are significantly safer. When you are using something to support healing, the last thing you want is to create harm through contamination or poor-quality products.
The bottom line: peptides are a fascinating and rapidly evolving area of medicine with real potential. But they are not risk-free, and they are not all created equal. If you’re interested in peptides, start with a conversation with an educated healthcare provider who understands both the science and the safety.
Your health is always worth doing properly.
