Collagen is the most abundant protein in your body, the scaffolding of skin, tendons, bone and cartilage. So, do collagen supplements work? The honest answer is: possibly a little, for some things. Several meta-analyses find small improvements in skin hydration and elasticity with hydrolysed collagen taken for 8–12 weeks, but many of the trials are small and industry-funded, and the effect shrinks when you look only at the most rigorous ones.

Collagen is neither a miracle nor a scam. It's a modest option that works best, if at all, on top of the things that protect collagen in the first place.

What happens to collagen when you swallow it?

This is where most scepticism starts, and it's a fair question. Collagen is a protein, and your gut digests proteins into amino acids and short chains of two or three amino acids. You don't absorb intact collagen, and your body doesn't send "collagen from a supplement" to your skin.

What researchers have found is that certain collagen-specific fragments, such as prolyl-hydroxyproline, do appear in the blood after people take hydrolysed collagen. Lab studies suggest these fragments may signal fibroblasts, the skin cells that make collagen, to become more active. It's a plausible theory with some supporting data, not settled science.

One nutritional footnote: collagen is an incomplete protein (it lacks the essential amino acid tryptophan), so it isn't a good replacement for protein from food.

Do collagen supplements work for skin?

This is the best-studied area, and the headline results look positive. A 2021 systematic review and meta-analysis in the International Journal of Dermatology pooled 19 randomised trials with 1,125 participants, mostly women aged 20 to 70. It found hydrolysed collagen improved skin hydration, elasticity and wrinkle measures compared with placebo, with most studies running around 90 days.

Now the caveats. Many of these trials were funded by collagen manufacturers, used small groups and measured changes with instruments rather than changes most people would notice in the mirror. A 2025 meta-analysis published in The American Journal of Medicine found that, when the analysis was restricted to higher-quality trials or those without industry funding, the benefits for skin were no longer statistically significant.

So the fairest summary is: small possible benefits, uncertain evidence. If you try collagen, give it at least eight to twelve weeks and judge it honestly.

What about joints, hair and nails?

What protects your collagen better than any supplement?

Your body's own collagen production slows with age. You'll often see the figure "about 1% a year from your mid-twenties" quoted online; the general trend is real, but that neat number is less precise than it sounds. What's clearer is that for women, collagen loss speeds up in the years after menopause as oestrogen falls, and that sun exposure accounts for much of the visible difference between skin that ages early and skin that doesn't. Compare the skin on the back of your hand with the inside of your upper arm and you'll see the point.

Several everyday factors speed up collagen breakdown, and addressing them has stronger evidence than any supplement:

1. Sunscreen every day. UV exposure is the main driver of premature skin ageing, breaking down collagen and elastin. In the tropics, broad-spectrum SPF 30 or higher is the single most effective anti-ageing step.
2. Don't smoke. Smoking reduces blood flow to the skin and damages collagen and elastin; it's strongly associated with earlier wrinkling.
3. Use a topical retinoid. Prescription tretinoin has decades of evidence for improving fine lines and texture, and over-the-counter retinol offers a gentler option.
4. Get enough vitamin C. It's essential for building collagen; severe deficiency causes scurvy, which is essentially a failure of collagen formation. Guava, papaya, citrus and leafy greens are excellent sources.
5. Eat enough protein. Your body builds collagen from amino acids like glycine, proline and lysine, found in fish, eggs, tofu, tempeh, chicken and legumes.
6. Protect your sleep. Poor sleep is linked with slower skin barrier recovery and more visible signs of ageing. Our guide on how to sleep better is a good place to start.

How to choose a collagen supplement

• Check the dose. Most skin trials used 2.5–10 g of hydrolysed collagen peptides a day. Gummies and tablets often contain much less than this, which is worth knowing before you set expectations.
• Look for "hydrolysed" or "collagen peptides". This is the form used in most research.
• Know the source. Collagen comes from bovine, porcine, chicken or marine (fish) sources. For Muslim consumers, look for recognised halal certification, such as JAKIM's.
• Be wary of big promises. Visible results in two weeks is not something the research supports.

If you'd like an easy daily ritual, TANO's GLOW effervescent tablets combine collagen peptides with vitamin C, which contributes to normal collagen formation for the normal function of skin, plus hyaluronic acid and glutathione. Check the label for amounts, and treat it as a complement to sunscreen, not a substitute. If glutathione is what caught your eye, we've looked at that evidence separately in our piece on what the science says about glutathione for skin.

This article is general information, not medical advice. Talk to a doctor or pharmacist before starting a supplement, especially if you're pregnant, on medication, managing a condition or have a fish or shellfish allergy.

Frequently asked questions

How long does it take for collagen supplements to work?

Most studies measured changes after 8 to 12 weeks of daily use, so give any collagen supplement at least two to three months. If you notice no difference by then, it's reasonable to stop.

How much collagen should I take a day?

Clinical trials on skin have typically used 2.5 to 10 grams of hydrolysed collagen peptides a day. There's no evidence that much higher doses give better results. Check how much a product actually contains per serving.

Is marine collagen better than bovine collagen?

There's no strong evidence that one source works better than the other for skin. Marine collagen is popular with people who avoid beef or pork, and both come in halal-certified forms. People with fish allergies should avoid marine collagen.

Can I get collagen from food instead?

Bone broth, fish skin and chicken feet contain collagen, but the amount varies widely. Eating enough protein overall, plus vitamin C from fruit and vegetables, gives your body the building blocks it needs to make its own collagen.

Are collagen supplements safe?

Collagen supplements are generally well tolerated, with occasional mild digestive upset reported. Check for allergens such as fish or egg, and speak to a doctor first if you're pregnant, breastfeeding or have kidney disease.

Sources

1. Harvard T.H. Chan School of Public Health: The Nutrition Source — Collagen
2. Cleveland Clinic: Collagen
3. NIH Office of Dietary Supplements: Vitamin C fact sheet
4. American Academy of Dermatology: How to select a sunscreen
5. PubMed: meta-analyses of oral collagen supplementation and skin
6. JAKIM Malaysian halal portal