Peptides are commonly used in prescription medications to treat conditions like diabetes and obesity, but they are also sold online and promoted for muscle growth, anti-aging, weight loss, and recovery. However, not all peptides are created equal.
There is much debate over the safety and effectiveness of individual peptides. Only FDA-approved peptide medications (such as insulin and GLP-1s) have undergone clinical review for safety and effectiveness.
Peptides newly approved for compounding (such as BPC-157, KPV, and TB-500) have only been evaluated for specific use cases. They have not been approved by the FDA or extensively tested for safety or effectiveness, especially with ongoing use. Doctors and scientists say there is a lack of sufficient scientific evidence for the safety of non-FDA-approved injectable peptides marketed for wellness.
We’re keeping track of the developing regulatory and medical evidence around peptides, but it’s best to speak with your doctor or healthcare professional before introducing any peptide product.
Whether or not peptides are safe depends on the type of peptide, where it comes from, and how it is used.
While some peptide medications have been carefully tested and approved for medical use, many peptides sold online have not gone through the same safety checks.
Peptides are short forms of proteins, and many are naturally produced in the body. Peptides have been used since their discovery in 1921, when scientists isolated and purified insulin for therapeutic use.
In the body, different peptides help control important functions such as hormone production, metabolism, healing, and communication between cells.
Synthetic peptides developed by scientists are used for medical uses. Some are approved to treat medical conditions, while others are still being studied. You’re probably most familiar with the peptides GLP-1s used for weight loss and diabetes. Scientists are also looking at peptides for use in aging and muscle repair, though research is in the early stages.
However, many unregulated peptides are sold online, often claiming to improve athletic performance, slow aging, or speed up recovery. These peptides often lack safety data in humans, and evidence comes mostly from animal studies or self-reports from people who use them.
Approved peptides are used to treat a range of medical conditions. For example, GLP-1s are prescribed for type 2 diabetes and obesity amongst other conditions. Other peptides are used in
Outside of healthcare, peptides are often marketed for bodybuilding, anti-aging, improved recovery, or better athletic performance. However, many of these uses are not supported by strong scientific evidence, and some products have never been tested in people.
Like any medication or supplement, peptides can cause side effects. The exact risks depend on the specific peptide, how it’s made, and whether it’s used according to its approved use.
Several factors may influence how safe a peptide is, including:
- Quality: Prescription medications are made under strict manufacturing standards. With unregulated medications, you cannot be sure how they were manufactured.
- Dosage: Taking too much, too little, or using a peptide for a purpose it wasn’t designed for can increase the risk of side effects.
- Delivery route: Injecting a peptide is much more risky than taking it orally or applying it to the skin since it bypasses your immune barriers. People who use peptides report injecting them subcutaneously or intramuscularly. Never inject peptides intravenously.
- Your health: Your overall health also matters. Medical conditions, allergies, and other medications can all affect how your body responds to a peptide.
Prescription peptide medications that have been approved by health authorities have been tested in clinical trials to make sure their benefits outweigh their risks. When used as directed and under medical supervision, many have a good safety record.
Unregulated peptides, including products sold online, cannot be guaranteed to contain the ingredients listed on the label. They could be contaminated, not contain the correct dose, or even contain different substances altogether. Because these products are not carefully tested or monitored by scientists, their safety and effectiveness are often unknown. For example, we don’t know if they could trigger a severe immune reaction or increase cancer risk in the long term. Some peptides aim to increase blood vessel growth in muscles to deliver more nutrients, so a very real concern for scientists is that these peptides might also inadvertently increase nutrient delivery to cancerous cells, too.
If you’re thinking about using any peptide — whether a prescription medication or a product sold online — it’s a good idea to speak with a healthcare professional first. They can explain the potential benefits, possible side effects, and whether the peptide is appropriate for your health needs. They can also help you avoid products that may be unsafe or unproven.
If you have used any product, regulated or not, and are experiencing side effects, don’t hesitate to speak with your doctor. It’s also important to tell your doctor everything, even if the product was not prescribed or you feel embarrassed to say what you used or how you used it. Healthcare professionals are used to speaking with people about all kinds of issues, and their main goal is to help you feel better.
Peptides are an exciting area of medicine and research, and some have transformed the treatment of conditions such as diabetes and obesity. However, not all peptides are created equal.
Prescription peptide medications have been studied for safety and are regulated before they reach patients. In contrast, many peptides sold online are unregulated, meaning their quality, purity, and safety cannot always be verified.
Topical peptides are often the safest option, as your skin has natural defenses that help protect you. Injecting a peptide is the riskiest as it bypasses your body’s defense mechanisms. Speak with a doctor if you are considering trying peptides or have experienced any negative effects from a peptide product.