Do collagen supplements work?

Key takeaways

• When you swallow collagen, your gut breaks it down. It does not travel to your face as collagen.
• Many positive collagen studies were funded by companies that sell it.
• A 2025 meta-analysis found no benefit in the non-industry-funded or high-quality trials.
• Collagen is probably harmless for most healthy people, but it is not cheap, and it is not magic.
• Daily sunscreen has a long-term randomised trial behind it. Collagen powder does not.

Why do people take collagen for their skin?

Every week someone shows me a tin of collagen powder and asks, "Doctor, is this worth it?" I understand the logic. Skin is made largely of collagen. We lose collagen with age. So eating collagen sounds like replacing what is lost.

See, what happens is, collagen is a protein. When you eat it, your digestive system breaks it into small pieces, amino acids and short chains of amino acids, before absorbing them. Your body then uses those building blocks wherever it needs them. It does not reassemble your supplement into skin collagen on your cheeks. Supplement makers argue that some of those short chains may signal skin cells to make more collagen. That is a reasonable thing to study. The question is whether it actually shows up as better skin.

What does the latest evidence say?

In 2025, Myung and Park published a systematic review and meta-analysis in The American Journal of Medicine. They looked at 23 randomised trials with 1,474 participants.

That is very important to understand. When the overall result looks positive but the positive effect disappears in the better studies, the honest conclusion is that we do not have good evidence.

What do supplement makers say in response?

To be fair, industry groups disagreed with the review, as reported by NutraIngredients. Their points included: - Different collagen types, doses and formulations were lumped together. - Some studies may have been misclassified as industry-funded or independent. - Most trials were done in Asia using relatively low doses, around 3 grams a day. - Industry funding does not automatically mean a study is poor.

These are fair debating points, and science moves. But the burden of proof sits with the product. Right now, independent high-quality trials have not shown a clear benefit. If future independent studies do, I will happily change my advice. I have changed my mind before when the evidence changed.

Is collagen harmful?

For most healthy adults, collagen powder is basically just a protein supplement. The concerns are more practical: - Cost. Collagen products in India are often expensive per month. That money could go to sunscreen you actually use every day. - What else is in the tin. Some products add sugar, flavours, biotin or other ingredients. Read the label. - Kidney disease or a protein-restricted diet. Check with your doctor before adding any protein supplement. - Allergies. Marine collagen comes from fish. Bovine collagen comes from cattle, which may matter to you for dietary or personal reasons.

Is protein in my diet important for skin, then?

Yes, but as overall nutrition, not as a skin treatment. Your body needs enough protein, vitamin C and other nutrients to make and repair tissue, skin included. Many Indian diets, especially vegetarian ones, are lighter on protein than people think.

Practical, everyday sources: - Dal, chana, rajma and sprouts - Paneer, curd, milk and buttermilk - Eggs, fish and chicken if you eat them - Soya chunks and tofu

Vitamin C comes from amla, guava, citrus, tomatoes and leafy greens. A balanced plate does more for your whole body than a tin with skin promises on the label.

What actually has evidence for skin ageing?

If you want to spend on anti-ageing, here is where I would put the money, in order:

1. Daily broad-spectrum sunscreen. In the Nambour trial in Australia, adults under 55 who used sunscreen daily for about four and a half years were 24% less likely to show increased skin ageing than those who used it when they felt like it. That is a randomised trial over years.
2. A topical retinoid at night, if your skin tolerates it. Prescription tretinoin has randomised trials showing improvement in fine wrinkles. See retinoids for anti-ageing.
3. A simple moisturiser. Mayo Clinic notes moisturisers temporarily plump the skin and make fine lines less visible.
4. Not smoking, enough sleep, and protein in your diet.

After that, if you want more, in-clinic treatments can address specific problems. Our evidence-based anti-ageing routine puts this together.

What I tell my patients

Normally I say: if you enjoy your collagen drink and can afford it, I will not fight you on it. It is unlikely to harm you. But please do not let it replace sunscreen, and do not expect it to change your face. Basically, I would rather you spend on what works, consistently, for years. That is how faces stay rested, not different.

How we approach this at Dr Tvacha

At a face assessment under the Long Game Anti-ageing Plan, I look at your skin, your routine and what you are already spending on. Often the most useful thing I do is remove products, not add them. Any treatment I suggest comes with a written plan and fees before you pay, and you decide.

Written by

Dr Amit KarkhanisAesthetic Physician · MBBS, Dip. Dermatology (UK) · Reg. No. 2001/02/1124

Founder of Dr Tvacha, practising in Thane since 2005. Leads the weight loss and hair programmes.