In the vast world of dietary supplements, few ingredients attract as much attention as collagen. Whether in liquid form, capsules, or powder, collagen supplements are everywhere today, promising an impressive range of benefits. But are those promises actually backed by science?
Made from hydrolyzed collagen, also known as collagen peptides, which has been broken down into smaller amino acids and is often combined with other key nutrients and minerals such as vitamin C and biotin, these supplements promise smoother, more hydrated, and firmer skin, along with a host of other purported health benefits. It is no surprise, then, that they have become the focus of growing interest.
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“Social media, influencer culture, and growing awareness around preventative aging have all contributed to their popularity,” says Hope Mitchell, MD, board-certified dermatologist and founder of Mitchell Dermatology. “They are an easy, non-invasive addition to a daily routine, which makes them especially appealing to consumers looking for accessible wellness solutions.”
“People want to feel like they are doing something from within to slow the signs of aging, rather than relying solely on products applied to the skin,” agrees Angela Lamb, MD, director of the Westside Mount Sinai Dermatology Faculty Practice and associate professor of dermatology at the Icahn School of Medicine.
Still, one of the golden rules of skincare and wellness is that if something sounds too good to be true, it probably is. And according to dermatologists, collagen supplements tend to reinforce that rule more than they challenge it.
The Strongest Evidence Supporting Collagen Supplements
Collagen supplements have been credited with a long list of benefits: promoting hair and nail growth, supporting bone and muscle health, easing digestive issues, and much more. The list seems endless. However, Hadley King, MD, a board-certified dermatologist based in New York City, points out that the evidence supporting many of these claims remains limited and requires further research. At present, she says, the strongest evidence relates to skin health.
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The reason is simple: the role of collagen in maintaining skin health and preserving its appearance over time is already well established. If these supplements truly stimulate collagen production, they could deliver the same well-known benefits for the skin. However, experts stress an important caveat.
“It’s important to understand that collagen supplements do not transport ingested collagen directly into the skin,” explains Helen He, MD, director of laser and aesthetic surgery and assistant professor of dermatology at the Icahn School of Medicine. “Instead, these peptides and amino acids may activate signaling pathways in the body that increase collagen production, ultimately leading to higher collagen levels in various tissues, including the skin.”
“We still don’t have a definitive answer as to whether the collagen we consume is preferentially directed to the skin,” adds Dr. King. “If it is, then it helps by directly increasing collagen levels in the skin. If it isn’t, it may still be beneficial by providing the amino acids the body needs to produce its own collagen.”
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Dr. King also points to research suggesting that collagen supplements may help maintain joint health as we age. Additional studies indicate that taking these supplements could reduce discomfort associated with physical activity and may even help strengthen connective tissue in the joints of highly active individuals.
Collagen Supplements and Real-World Results
Despite the existing research, experts continue to advise keeping expectations in check. Study results remain too inconsistent to draw firm conclusions, even when it comes to skin health.
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“Your body doesn’t know that the collagen you consume orally is intended specifically for your skin,” explains Blair Murphy-Rose, MD, a board-certified dermatologist. “While these amino acids are among the building blocks required to produce collagen, the body also uses them for countless other essential functions. You can’t assume that consuming collagen will automatically result in the creation of new collagen in the skin.”
Dr. Lamb adds, “The key question is always how much is actually absorbed and how much is simply processed by the body.”
Dr. Mitchell also emphasizes that any potential benefits can only be achieved through regular and consistent use. Even then, she says, the results are “modest rather than dramatic.”
Who Benefits Most From Collagen Supplements?
It may sound paradoxical, but Dr. He believes collagen supplements are best suited to healthy individuals who already take good care of their skin through a consistent skincare routine, regular sunscreen use, and aesthetic treatments tailored to their specific needs.
“These individuals understand that collagen supplements are simply an additional layer of support for an existing routine, not a replacement for it,” she says. “They have realistic expectations.” These supplements may also be more beneficial for people without significant chronic health conditions who maintain a healthy diet.
Dr. He cautions that collagen supplements can cause digestive side effects such as nausea and bloating, and that many users find their taste, particularly in powder form, unpleasant. She also notes that they are often combined with biotin, which can affect test results related to thyroid function and markers of cardiac stress.
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It is also important to note that collagen is most commonly sourced from animals such as cattle, pigs, or fish, which may not be suitable for people who avoid animal-derived products or follow a vegan lifestyle.
Are Collagen Supplements Necessary?
All of the experts agree that collagen supplements should never be viewed as a substitute for skincare products whose effectiveness has been supported by extensive research and proven results. This applies primarily to products such as sunscreen, retinoids, and antioxidants.
Collagen supplements can be a useful addition to a daily routine and are generally not harmful, but experts stress that they are not essential if you already maintain a healthy lifestyle and take proper care of your skin and overall health.
“These supplements are not essential,” says Dr. King. “People who consume adequate amounts of protein and maintain good overall nutritional health may already be getting all the amino acids needed for collagen production.”
Dr. Mitchell agrees and advises researching the manufacturer before making a purchase. She recommends choosing high-quality, well-formulated products that have undergone rigorous quality testing, such as Nutrafol Collagen Infusion, Vital Proteins Collagen Peptides, and Vida Glow Original Marine Collagen.
“When it comes to collagen supplements, there is a mix of science and marketing at play,” she concludes. “While there is legitimate research supporting certain benefits, many studies are small or industry-funded, and marketing claims often go beyond what the evidence can reliably support. It’s important to approach these products with realistic expectations.”