Collagen is the protein that gives skin its structure, and we make less of it as we age. So it makes intuitive sense to try to replace it: in coffee, in smoothies, in gummies, in creams. But does swallowing collagen, or rubbing it on, actually show up on your skin?
Here's what the studies say, how to get collagen without a supplement and how to shop for collagen products without paying for hype.
How collagen supplements work
Most supplements contain hydrolyzed collagen, also called collagen peptides: collagen broken down into small pieces so it's easier to absorb. Your body doesn't send that collagen straight to your face. It digests it into amino acids and small peptides, which the body can then use wherever it needs them.
The theory is that some of these peptides also act as signals that encourage skin to make its own collagen. That's what researchers have been testing.
What the research says
A 2023 systematic review and meta-analysis in the journal Nutrients pooled 26 randomized controlled trials with 1,721 participants. It found that hydrolyzed collagen supplements significantly improved skin hydration. The authors were careful about the limits: they identified several sources of bias in the trials and concluded that larger randomized studies are still needed.
Individual trials give a sense of what's realistic. In one well-known double-blind study in Skin Pharmacology and Physiology, 69 women aged 35 to 55 took 2.5 g or 5 g of a specific collagen peptide, or a placebo, every day for eight weeks. Both collagen groups showed better skin elasticity than placebo, with stronger effects in women over 50. The authors noted that their results applied only to that specific peptide, not to every collagen product on the shelf.
Collagen supplements look promising for hydration. They're a helpful extra, not a replacement for sunscreen and skincare.
How to choose a collagen supplement
In the U.S., the FDA is not authorized to approve dietary supplements for safety and effectiveness before they're sold. That puts more of the homework on you.
- Look for hydrolyzed collagen or collagen peptides on the label.
- Check the dose. Skin studies have often used a few grams a day; the trial above used 2.5 g to 5 g. A product with a tiny amount mixed into a long ingredient list may not get you there.
- Look for an independent testing seal, which confirms what's in the container matches the label.
- Read the full label for added sugar, flavors and fillers, especially in gummies and ready-to-drink options.
- Give it time. Most trials run for eight to twelve weeks before measuring results.
- Talk to your doctor if you're pregnant, have a medical condition or take other supplements.
Marine or bovine collagen: which is better?
| Marine collagen | Bovine collagen | |
|---|---|---|
| Comes from | Fish skin and scales | Cow hides and bones |
| Good fit if | You eat fish but avoid red meat, or follow a pescatarian diet | You avoid fish or have a fish allergy |
| Avoid if | You're allergic to fish | You avoid beef for dietary or religious reasons |
| Price | Usually higher | Usually lower |
You'll see plenty of marketing claiming one source absorbs better or works faster. Most skin studies tested specific peptide products rather than comparing sources head to head, so the research doesn't clearly favor either. Choose based on your diet, allergies and budget, then look at the dose and testing.
What about "vegan collagen"?
Collagen comes from animals, so most products sold as vegan collagen don't contain collagen at all. They usually contain vitamin C, amino acids or plant extracts meant to support your body's own production. That can still be useful, but check the label so you know what you're buying.
How to get collagen without supplements
Your body has been making collagen your whole life. You can support that process with what you eat and how you live, with or without a powder.
1. Eat foods that contain collagen
Collagen is found in the connective tissue, skin and bones of animals. The most practical sources are:
- Bone broth made from bones and joints
- Gelatin, which is cooked collagen
- Chicken and fish with the skin on
- Slow-cooked cuts with connective tissue, like shank or oxtail
One caveat: researchers who analyzed bone broth found its amino acid content varied a lot depending on the recipe, and concluded it's unlikely to be a consistently reliable source compared with the doses used in collagen studies. Gelatin is more predictable: in a small study, it raised collagen-related amino acids in the blood about as much as a collagen peptide powder.
2. Give your body the building blocks
You don't need to eat collagen to make collagen. Your body builds it from amino acids, especially glycine and proline, that come from the protein you eat: eggs, dairy, fish, poultry, meat, beans, lentils and soy. Getting enough protein across the day matters more than any single food.
3. Don't skip vitamin C
Vitamin C is essential for making collagen: it acts as a co-factor for the enzymes that stabilize collagen's structure. A review in Nutrients notes that skin naturally holds high levels of vitamin C and that diets rich in fruits and vegetables supply plenty of it. Good sources include citrus, kiwi, strawberries, bell peppers, broccoli and leafy greens.
4. Protect the collagen you already have
Making new collagen is only half the story. Sun exposure, smoking and a diet high in sugar all speed up its breakdown. Daily sunscreen, not smoking and keeping added sugar in check protect what you have. Read more about how sugar affects skin and the best foods for your skin.
Collagen in skincare: what works and what doesn't
Collagen creams and serums are a different story from supplements, and the labels can be misleading.
Can collagen in a cream reach your skin's collagen?
No. Molecules generally need to be smaller than about 500 daltons to pass through the skin's outer barrier. Collagen is roughly 300,000 daltons, and even hydrolyzed collagen is thousands of daltons, so it stays on the surface. There, it works as a moisturizing ingredient: it helps hold water and forms a light film that can make skin look smoother for a while. Pleasant, but it doesn't add collagen to your skin.
What can support the look of firmer skin
| Ingredient | Why it's worth considering |
|---|---|
| Retinoids | The most studied option for fine lines and texture. Use at night and start slowly. See retinol alternatives if they irritate you. |
| Peptides | Signal peptides send messages linked to collagen and elastin and are gentle enough for daily use. See peptides in skincare. |
| Vitamin C | An antioxidant tied to collagen production. How well it reaches the skin depends a lot on the formula. |
| Growth factors and conditioned media | Signaling molecules from the world of regenerative skincare, with promising early research. See growth factor serums. |
| Sunscreen | Not glamorous, but the best way to protect the collagen you have. |
How to shop for a "collagen" skin product
- Don't buy the word on the front. "Collagen cream" often just means collagen is somewhere on the ingredient list as a moisturizer.
- Look for the ingredients above on the back label, and check whether the brand names them clearly.
- Be skeptical of promises to "add," "replace" or "restore" your collagen. Under U.S. rules, a cosmetic can only talk about how skin looks and feels.
- Keep your routine simple: one targeted product, daily moisturizer and sunscreen beat a shelf of overlapping creams.
That's the logic we followed with our own Stem Cell Regenerative Cream. Rather than promising to put collagen into your skin, it combines a peptide blend with stem cell conditioned media and hyaluronic acid. Customers tell us their skin looks firmer and smoother with consistent use, and it fits right alongside a supplement if you take one.
Inside and out: how it all fits together
Supplements work from the inside; skincare works on the surface. Neither replaces daily sunscreen, which protects the collagen you already have. If loss of firmness is your main concern, our guide to sagging skin on the face covers what helps at home and in the clinic. Sleep matters too: here's what happens to your skin overnight.
So, should you take collagen?
If you want to try it, the evidence is encouraging, especially for hydration: choose a tested hydrolyzed collagen at a dose close to what studies used and give it two to three months. If you'd rather not, you can still support your skin's own collagen with enough protein, plenty of vitamin C-rich foods, daily sunscreen and skincare with ingredients that actually reach the skin. For the bigger picture, read our guide to skin longevity.
Written by the CharaOmni Team
CharaOmni was founded by Dr. Joy Kong, MD, a triple board-certified, UCLA-trained physician named Stem Cell Doctor of the Decade in 2021. Our team researches every guide using peer-reviewed studies and official health sources, so you can make informed decisions about your skin.
Sources
At CharaOmni, we take what we share seriously. Every claim in our guides is backed by real, verifiable sources: peer-reviewed research, official health authorities and established scientific institutions. We link to every source so you can read it yourself and make informed decisions about your skin.
- Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients. 2023.
- Proksch E, et al. Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology: a double-blind, placebo-controlled study. Skin Pharmacology and Physiology. 2014;27:47-55.
- U.S. Food and Drug Administration. Information for Consumers on Using Dietary Supplements.
- Alcock RD, Shaw GC, Burke LM. Bone broth unlikely to provide reliable concentrations of collagen precursors compared with supplemental sources of collagen used in collagen research. International Journal of Sport Nutrition and Exercise Metabolism. 2019;29(3):265-272.
- Alcock RD, et al. Plasma amino acid concentrations after the ingestion of dairy and collagen proteins, in healthy active males. Frontiers in Nutrition. 2019;6.
- Pullar JM, Carr AC, Vissers MCM. The Roles of Vitamin C in Skin Health. Nutrients. 2017;9(8):866.
- Bos JD, Meinardi MM. The 500 Dalton rule for the skin penetration of chemical compounds and drugs. Experimental Dermatology. 2000;9(3):165-169.
- Schagen SK. Topical Peptide Treatments with Effective Anti-Aging Results. Cosmetics. 2017;4(2):16.
- U.S. Food and Drug Administration. Is It a Cosmetic, a Drug, or Both? (Or Is It Soap?)
This article is for educational purposes only and is not medical advice. CharaOmni is a cosmetic product and is not intended to diagnose, treat, cure or prevent any disease.