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Decoding Peptides: What They Are, Their Rewards – and Their Potential Risks

Evidence Based

iHerb has strict sourcing guidelines and draws from peer-reviewed studies, academic research institutions, medical journals, and reputable media sites. This badge indicates that a list of studies, resources, and statistics can be found in the references section at the bottom of the page.

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Key Takeaways

  • Peptides are short chains of amino acids: They occur naturally in the body and are also used in supplements, skin care, and research applications.
  • Different peptides serve different functions: Some are associated with skin care, muscle support, recovery, or signaling activity in the body.
  • Peptides are used in a variety of product types: Powders, capsules, injections, and topical skin care formulas are among the common formats.
  • Research on peptides continues to evolve: Interest has grown across areas like healthy aging, fitness, and cosmetic applications.
  • Product quality and intended use can vary widely: Peptide formulas differ in sourcing, delivery method, and regulatory classification.

If ever there were a Health and Beauty Answer to Everything, peptides might be it — but it’s too soon to say, and they’re not without risk.

Clinical human trials on the therapeutic uses of peptides are in their infancy. Much of the research to date has been on animals.

“While peptides have been known for a century, scientists have only recently discovered easy ways to identify them and make them in large enough quantities to be marketable,” says Dr. Suzanne Ferree, MD, FAARM, ABAARM, senior physician at Vine Medical Associates in Atlanta and author of Counterclockwise: Using Peptides to Renew, Rejuvenate, and Rediscover. “So that’s why you’re just now hearing about them.”

Or at least, that’s why right now you’re hearing about how peptides can do everything from help a hangover to increase your lifespan.

What Are Peptides?

In the most basic scientific sense, peptides are small proteins. They bind to your cells and affect them in different ways.

“There are literally thousands of peptides being made by your body at this very second, as signaling agents to trigger innumerable processes from temperature regulation and setting your inner clock to recovering from workouts,” Dr. Ferree says.

Peptides often have overlapping effects, and one peptide can even do more than one thing.

You’re more familiar with your body’s peptide production than you think.

Ghrelin, which signals hunger, is a peptide. So is oxytocin, which stimulates milk let-down for breastfeeding and bonds mother to child and lover to lover (again, a peptide can do more than one thing).

Peptides can also be synthetically manufactured. You’re familiar with these peptides, too.

Insulin, which regulates blood sugar, is the granddaddy of them, discovered in 1921. Your body produces insulin, but pharmaceutical companies also started manufacturing insulin shortly after its discovery, a lifesaver for diabetics.

A contemporary synthetic peptide example is Ozempic, the headlining prescription weight-loss drug (which also helps diabetics, its intended use — multipurpose yet again!).

How Do Peptides Work?

Peptides can act in all sorts of biological ways — as hormones or neurotransmitters, for instance, and are sometimes called as much. Oxytocin is the “love hormone,” right?

As expected, when we age, “our bodies produce less of the youthful peptides and more of those related to aging,” Dr. Ferree says. “So if we can replace the lost peptides with injections, capsules, creams, or nasal sprays, often we can restore the more youthful function of our bodies.”

What Conditions Can Peptides Affect?

Peptides are purported to have power over so many issues, they might as well be called the (Potential) Swiss Army knife of health, beauty, and wellness.

Here’s a list of things peptides can address, per Dr. Ferree: hair loss, wrinkles, sex drive and arousal, fatigue and energy levels, hangovers, immune vitality, joint pain, tendon healing, general recovery after exercise, mood balance, sleep-wake cycle, heart health, intestinal health, endometriosis, osteoporosis, menopausal weight gain, general weight gain, depression, anxiety, aging en toto, the diseases of aging

Peptides also can: trigger your skin to become darker (a tan without sun!), and ease autoimmune conditions, including multiple sclerosis, rheumatoid arthritis, and Hashimoto thyroiditis

Sign you up, right? I stuck to what my expert source shared, but if you noodle around online, you’ll find even more apparent selling points.

What’s the Best Way to Use Peptides?

The safest and most effective way to try peptide therapy is to consult a board-certified physician who works with peptides. They’ll know which peptides are expected to work best at treating particular conditions and encouraging certain outcomes.

Equally important, a physician is able to prescribe peptides that are FDA-approved, as opposed to you buying some concoction you find online. About 80 peptide drugs have been approved worldwide, as of 2022. Those approved by the FDA include insulin, Ozempic (semaglutide), sermorelin, and Vyleesi (bremelanotide), to name just a few.

Often, peptides are used in off-label ways for people to get the therapeutic results they want. 

What Are the Risks of Using Peptides?

You might be tempted to view peptides as the ultimate fix, but that can be dangerous. Again, a qualified physician should keep you course-corrected.

Consider anxiety and depression, which are “complicated” conditions, Dr. Ferree notes, but “inflammatory states of the brain,” nonetheless.

“One peptide, thymosin alpha-1, changes the way the inflammatory process occurs in the brain, so when it’s added to a peptide stack, much can be done to ease anxiety and depression,” she says. “I’m not suggesting those who struggle with depression and anxiety stop their prescribed medications, but this may be a way that a provider could help you actually treat what’s wrong instead of the symptoms.”

And peptide use can come with consequential side effects, a point of fact that a qualified medical professional is sure to warn.

For example, peptides you take for tissue repair might help heal an injury (yay!) — but also increase growth of a tumor (definitely not yay). In other words: The downside of a peptide being able to do more than one thing is that a peptide can do more than one thing. 

References:

  1. American Diabetes Association. (2019). A history of the wonderful thing we call insulin. ADA Consumer Health Information Portal.
  2. Rossino, G., Marchese, E., Galli, G., Verde, F., Finizio, M., Serra, M., Linciano, P., & Collina, S. (2023). Peptides as therapeutic agents: Challenges and opportunities in the green transition era. Molecules, 28(20), Article 7165. 
  3. U.S. Anti-Doping Agency. (2021). 6 things to know about peptide hormones: Clinical safety, regulatory standards, and anti-doping regulations. USADA Spirit of Sport Education Series.
  4. Wang, L., Wang, N., Zhang, W., Cheng, X., Yan, Z., Shao, G., Wang, X., Wang, R., & Fu, C. (2022). Therapeutic peptides: Current applications and future directions. Signal Transduction and Targeted Therapy, 7(1), Article 48. 

DISCLAIMER: These statements have not been approved by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent disease.