Key takeaways:
Peptides are short chains of amino acids that naturally occur in the body. Others are lab-made and developed into prescription medications, while some of these remain experimental.
FDA-approved peptide medications are used for weight loss, Type 2 diabetes, and osteoporosis, among other uses. Examples include semaglutide (Wegovy, Ozempic), tirzepatide (Zepbound, Mounjaro), and teriparatide (Forteo, Bonsity).
Experimental peptides are promoted for a variety of uses, from wound healing and muscle recovery to longevity. Examples include BPC-157, KPV, and MOTS-c. Many experimental peptides don’t have enough evidence to show that they work well or would be safe for people to use.
The recent popularity of glucagon-like peptide-1 (GLP-1) medications and growing interest in compounded peptides have brought peptides into the mainstream.
Peptides seem to be everywhere these days. They range from blockbuster weight-loss medications like Wegovy (semaglutide) to experimental peptides promoted for muscle recovery, longevity, and other wellness goals.
Despite all the attention, the word “peptide” doesn’t tell you much by itself. It describes a type of molecule, not whether it’s FDA-approved, experimental, or backed by strong clinical evidence.
Here we’ll discuss what peptides are, what they’re used for, and why they’ve become one of the most talked-about topics in health and wellness.
What are peptides?
Peptides are short chains of amino acids, which are the building blocks that make up proteins. Your body naturally produces thousands of peptides, many of which act as chemical messengers. These signaling molecules help regulate many important functions throughout the body, including:
Blood glucose (sugar) regulation
Growth and tissue repair
Immune function
Hormone release
Because peptides regulate so many biological processes, researchers have developed synthetic (lab-made) versions that can mimic or enhance these effects for medical uses.
How are peptides used in medicine?
FDA-approved peptide medications target specific receptors (binding sites) and biological pathways in the body. This allows them to produce precise effects. Today, peptide medications are used to treat a variety of health conditions, including:
Type 2 diabetes
Osteoporosis
Infections
Fertility problems
Hormone-related conditions, such as endometriosis
There are also a variety of peptides available in over-the-counter (OTC) products. For example, you can buy collagen peptides OTC. Certain peptides, such as palmitoyl pentapeptide-4, are also found in OTC skin and hair care products.
Researchers continue to study peptides for many other health conditions and uses.
Why are most peptide medications injections?
Most peptide medications are given as injections because peptides are fragile molecules. If taken by mouth, many peptides break down in the stomach and aren’t absorbed well enough to reach the bloodstream.
Researchers have overcome this challenge for some peptides. They’ve boosted absorption of oral medications with special formulations. As a result, a few peptide medications are now also available as pills, such as semaglutide (Wegovy pill, Ozempic pill).
Which peptides are FDA approved, and which are still experimental?
Not all peptides are at the same stage of development. Some peptide medications have completed years of laboratory research, clinical trials, and FDA review before becoming approved treatments. Others remain experimental and are still being studied to see if they work and are safe for people.
The chart below details examples of FDA-approved peptide medications.
| Medication name | Form(s) | Use(s) |
|---|---|---|
| Semaglutide (Wegovy, Ozempic) |
|
|
| Tirzepatide (Zepbound, Mounjaro) | Injection |
|
| Teriparatide (Forteo, Bonsity) | Injection |
|
| Leuprolide (Lupron Depot, Lupron Depot-Ped) | Injection |
|
Experimental peptides come in different forms for a variety of uses. Many are sold as supplements or “research-use only” products not intended for human use. They may also carry a higher risk of contamination, impurities, and poor manufacturing conditions. The chart below shows common examples of experimental peptides.
| Peptide name | Examples of form(s) | Examples of promoted use(s)* |
|---|---|---|
| BPC-157 |
|
|
| KPV |
|
|
| TB-500 |
|
|
| MOTS-c |
|
|
| Emideltide |
|
|
| Semax |
|
|
| Epitalon |
|
|
*These are common promotional claims. Many of these peptides have limited human clinical evidence (if any) supporting these uses. They aren’t FDA approved.
Why aren’t certain peptides FDA approved?
Developing a new medication takes years of research. Before the FDA approves a peptide medication, researchers must show that it’s safe and works for its intended use. This typically requires preclinical research followed by several phases of human clinical trials.
Researchers also need to determine the appropriate dosage, identify common side effects and drug interactions, and show that the medication can be manufactured consistently.
Many experimental peptides simply haven’t reached the level of evidence needed for FDA approval. Some have shown promising results in laboratory or animal studies. But they still need larger, well-designed clinical trials to determine if they work and are safe for people to use. Conducting these studies also requires substantial time, funding, and an organization willing to sponsor the research.
Why patents come up in the discussion
Some people believe that certain experimental peptides haven't advanced because naturally occurring peptides generally can't be patented. Since developing a new medication requires a substantial investment, companies may be less likely to fund large clinical trials needed for FDA approval.
However, companies can often patent modified versions of peptides, new formulations, or specific medical uses. And regardless of patent status, the FDA still requires strong evidence that a peptide medication works and is safe before approving it.
Why are peptides trending?
Peptides have attracted much more public attention in recent years. The success of GLP-1 medications introduced millions of people to peptide-based treatments. And social media has fueled interest in experimental peptides promoted for muscle recovery, longevity, and other wellness benefits.
More recently, several experimental peptides — including BPC-157, MOTS-c, and semax — have been in the spotlight. That’s because the FDA is reviewing whether they should be added to the 503A Bulks List. This list identifies bulk drug substances that may be used by pharmacies to compound medications.
If added, some of these peptides could become more widely available through compounding pharmacies. But it’s important to remember that being eligible for compounding isn’t an FDA endorsement or approval. Many of these peptides continue to have limited human clinical evidence for the uses for which they’re commonly promoted.
Are peptides safe?
The safety of a peptide depends on the specific product, not simply whether it’s called a peptide. In general, peptide products that are regarded as safe tend to have:
Strong human evidence showing they work and are safe
FDA approval for a specific medical use
High manufacturing standards that help ensure quality and consistency
No peptide product is completely risk-free. But understanding these factors can help you better evaluate the benefits and risks of different peptide products. If you’re considering a peptide, a healthcare professional can help you determine if it’s appropriate for you.
Are peptides natural?
Some are. Your body naturally produces many different peptides that help regulate important processes such as metabolism and immune function. But many peptide medications and experimental peptides are synthetic versions made in laboratories. And there often isn’t enough research to know what can happen when natural peptide levels are increased or changed.
Are peptides steroids?
No, peptides and steroids are different types of compounds that work in different ways. Peptides are made of amino acids, while steroids are hormone-based compounds. They’re sometimes used for similar purposes, such as muscle growth. But they work differently in the body and have different risks and side effects to consider.
The bottom line
Peptides are a diverse group of compounds with important roles in both the human body and modern medicine. Some peptides have become FDA-approved medications for uses ranging from weight loss to cancer treatment. Others remain experimental and require more research.
As interest in peptides continues to grow, understanding the differences between approved and experimental products can help you make more informed decisions about your health.
Why trust our experts?
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