Dr. Carol Eisenstat, board-certified physician and founder and medical director of Line Eraser MD, was recently featured in IPSY in an article examining the growing popularity of peptide injections and the important differences between approved medications and unapproved products promoted online.
The feature explores why peptides have become such a major topic in wellness and biohacking, what patients should understand about their safety, and why the term “peptide” should not be treated as if it refers to one single type of treatment.
What Are Peptide Injections?
Peptides are short chains of amino acids, but different peptides can perform very different functions in the body.
Some peptides appear in topical skincare products, while others are used in prescription medications. Certain FDA-approved medications, including some GLP-1 treatments, are peptide-based drugs. However, this does not mean that every product marketed as an injectable peptide has undergone the same testing or regulatory review.
Dr. Eisenstat explains that this distinction is especially important as unapproved peptides become increasingly visible in fitness, longevity, and biohacking communities.
Patients who want to better understand peptides in skincare can also read our guide to what peptides are and how they work in skincare.
Why Are Peptide Injections Becoming So Popular?
According to Dr. Eisenstat, the growing interest comes partly from the rise of GLP-1 medications and partly from biohacking and longevity communities that have experimented with other peptides for goals such as muscle growth, recovery, sleep, and fat loss.
The problem is that products discussed online under the same broad “peptide” label may have very different levels of evidence behind them.
Some unapproved peptides promoted online rely largely on animal studies or personal testimonials rather than strong human research. Some may even be sold as research chemicals rather than products intended for human use.
Are Peptide Injections Safe?
There is no single answer because peptide injections cover many different substances.
FDA-approved injectable medications have been studied for specific uses, dosing, safety, and effectiveness. Even approved treatments should still be prescribed and monitored by a qualified healthcare provider.
Dr. Eisenstat’s concern is particularly focused on unapproved injectable peptides obtained outside established medical channels. With these products, important questions may remain about manufacturing quality, contents, dosing, side effects, and whether they have been adequately studied in people.
Her advice is straightforward: patients should know exactly what substance they are considering, where it comes from, whether it has been approved for the intended use, and who is prescribing it.
Peptides in Skincare Are Different
Peptide serums and injectable peptides should not be treated as interchangeable.
Topical peptides are commonly used in skincare products designed to support smoother, firmer-looking skin. Injectable products act very differently and require an entirely different level of medical consideration.
For more information on the role peptides may play in skin health, read the benefits of peptides for anti-aging.
A Physician-Led Approach Matters
At Line Eraser MD, treatment decisions are based on evidence, patient history, individual goals, and appropriate medical supervision rather than social-media trends.
Learn more about Dr. Carol Eisenstat and Line Eraser MD’s physician-led approach to aesthetic care.
Read the complete IPSY article: Why Is Everyone Injecting Peptides—and Is It Actually Safe?.
