What happens to your skin when you take collagen and vitamin C together

Supplement stacking for skin health? Find out if combining collagen and vitamin C is worth the hype.

Key Points

• Collagen supplements may modestly improve skin hydration, elasticity and wrinkles.
• Vitamin C supports collagen production, but most people get enough from food.
• Pairing collagen and vitamin C may not provide extra skin benefits.

Collagen supplements have made their way into many beauty routines, promising everything from fewer fine lines to more supple skin. Now, many companies are taking it a step further by adding vitamin C to their collagen formulations, claiming that this dynamic duo can support healthy skin aging even more than collagen alone. 

But the real question is: Are collagen and vitamin C supplements truly stronger together, or is the science being stretched too thin? We spoke with supplement and skin-health experts to find out what really happens to your skin when you take collagen and vitamin C together.

How Collagen Affects Your Skin

Collagen is the most abundant protein in the skin. It acts as a supportive framework that helps maintain the skin’s structure, strength and firmness. “As we age, collagen production naturally declines and its breakdown speeds up, accelerated by UV exposure. Over time, this contributes to thinner skin, fine lines, wrinkles and loss of elasticity,” says Blair Murphy-Rose, M.D., FAAD.

While we can’t completely prevent collagen loss, collagen peptide supplements may help minimize some of the visible signs of skin aging. “The current evidence suggests collagen peptide supplements can produce modest improvements in skin hydration, elasticity and wrinkle appearance, typically after 8 to 12 weeks of consistent daily use,” says Josie Burridge, Ph.D., M.P.H.

The good news is the evidence has become increasingly consistent. Burridge points to one meta-analysis of 26 randomized controlled trials that found improvements in elasticity and hydration. She explains that these benefits may occur because collagen peptides survive digestion, enter circulation and signal specialized cells called fibroblasts to ramp up collagen production.

Although the evidence is promising, Burridge emphasizes that the research is not without limitations. “A 2025 meta-analysis of 23 trials found that the benefits were strongest in industry-funded studies and less clear in independently funded ones. However, independent trials are also usually the smallest, so lack of statistical significance doesn’t necessarily mean lack of effect.” She notes that many trials are also short, and products vary in source, dose and peptide size. Still, collagen peptides may be a reasonable, low-risk way to support skin health.

How Vitamin C Affects Your Skin

Vitamin C may be best known for supporting immune health, but it also plays a crucial role in maintaining healthy skin. “Vitamin C is essential for collagen synthesis. The body needs it as a cofactor for enzymes involved in building and stabilizing collagen,” says Keri Glassman, M.S., RDN, CDN. She adds that it is also an important antioxidant, helping to protect skin cells from oxidative stress and support proper wound healing.

Given its role in collagen production and antioxidant defense, vitamin C supplements have sparked the attention of those looking to improve their skin’s appearance. However, studies suggest that the topical application of vitamin C benefits the skin more than oral intake. For this reason, Glassman notes that a supplement may only be useful for someone whose intake is consistently low or who follows a very restrictive diet.

However, “most people who regularly eat fruits and vegetables can meet their needs through food. Adult women generally need 75 milligrams per day, and adult men need 90 milligrams, with higher needs for people who smoke,” says Glassman. She notes that bell peppers, citrus fruit, berries, kiwi, broccoli and Brussels sprouts are all excellent sources.

Does Pairing Vitamin C with Collagen Make It Work Better?

Since vitamin C is necessary for collagen production, it’s easy to assume that taking a vitamin C supplement alongside collagen will automatically amplify its benefits. While the idea makes biological sense, the answer is more nuanced.

Vitamin C does, in fact, help the enzymes responsible for forming and stabilizing collagen do their job effectively. However, “while vitamin C is required, it’s only up to the amount those enzymes need. Once vitamin C status is adequate, taking more does not necessarily make collagen synthesis continue increasing,” says Burridge. Therefore, if you’re already getting enough vitamin C through your diet, there’s no strong evidence that taking extra vitamin C alongside collagen provides additional skin benefits, says Murphy-Rose. She points out that many collagen supplements include vitamin C, but it’s difficult to know whether the vitamin C is driving the results.

In fact, “the clinical evidence is limited because most studies test combined products rather than collagen with and without vitamin C,” says Burridge. She points to a small 2014 study that did test this, which found that adding 500 mg of vitamin C to collagen did not improve skin hydration or elasticity more than collagen alone. The combination may make sense for people with low vitamin C intake, but for those who already meet their daily needs, taking additional vitamin C with collagen is unlikely to enhance its skin-supportive effects.

Other Tips to Support Skin Health

While collagen supplementation may be beneficial for skin health, Murphy-Rose emphasizes that it should never replace proven skin-care strategies, such as:

• Wearing Sunscreen. “The most effective skin-aging strategy is also the least glamorous: protect your skin from the sun,” says Glassman. She notes that sunscreen can help limit UV damage—one of the biggest external drivers of collagen breakdown, wrinkles and uneven pigmentation.
• Following a Consistent Skin-Care Routine. Murphy-Rose recommends following a consistent skin-care routine that includes sunscreen, moisturizer and ingredients like retinoids and antioxidants when appropriate.
• Eating a Nutritious Diet. “Eat adequate protein to supply the amino acids needed to build and repair tissue, along with plenty of colorful fruits and vegetables for vitamin C, carotenoids and polyphenols,” says Glassman. She also suggests including healthy fats from foods like olive oil, avocado, nuts, seeds and fatty fish.
• Staying Hydrated. While hydration won’t erase wrinkles, Glassman shares that chronically underhydrated skin will not look or function at its best. Therefore, it’s important to drink enough water each day.
• Prioritizing Healthy Lifestyle Habits. Staying physically active, managing stress and avoiding smoking also play important roles in maintaining healthy skin.
• Consulting with a Dermatologist. “Working with a board-certified dermatologist is the smartest move for persistent skin changes, new or changing spots or anyone who wants a more targeted anti-aging plan,” says Glassman.

Our Expert Take

When it comes to skin health, there’s no single supplement that can turn back the clock. Collagen peptide supplements may offer modest benefits for wrinkle appearance, skin hydration and elasticity, while vitamin C plays an important role in collagen production. But pairing the two supplements isn’t necessarily a shortcut to better skin results, especially if you already get enough vitamin C through your diet.

Read the original article on EatingWell