No Good Evidence Oral Collagen Reverses Skin Ageing, Dermatologist Says

Roughly 5.3 million people in the UK — one in ten adults, by YouGov's count — have tried collagen supplements. A leading Harley Street dermatologist says the science behind that habit doesn't hold up.

Dr Anjali Mahto, consultant medical and cosmetic dermatologist and author of the best-selling book The Skincare Bible, delivered the warning on Which?'s Healthy Living Podcast, in an episode titled "The Science Behind Collagen Supplements (Does It Work?)". She was joined by Shefalee Loth, a nutritionist who leads research for Which?'s health and wellbeing team after more than 20 years with the NHS, the London School of Hygiene and Tropical Medicine and the World Cancer Research Fund.

"There is no good evidence that taking an oral collagen supplement for your skin is going to reverse the ageing process or slow down the ageing process or thicken up the collagen in the skin," Dr Mahto said.

Why the market grew anyway

Collagen is the most abundant protein in the body, at roughly 25% to 30% of all protein. It works as biological scaffolding for skin, bones, tendons, ligaments, cartilage and blood vessels. Production starts declining in our twenties — a fact marketers repeat often.

Demand has been fuelled by social media, wellness culture and the "beauty-from-within" movement. The wider backdrop is substantial: around 42% of UK adults take at least one dietary supplement regularly, according to the most recent data.

The takeaway: popularity and evidence are moving at very different speeds.

What the trial data actually shows

The picture isn't entirely empty. Clinical reviews suggest eight to 12 weeks of daily hydrolysed collagen peptides may support skin elasticity, hydration and joint mobility. But evidence for reducing deep wrinkles, thickening hair or speeding nail growth remains limited.

Dr Mahto outlined three reasons for her scepticism:

• The majority of existing studies are funded by the supplement industry itself.
• The body doesn't instinctively route consumed collagen to the skin — more than 30 distinct collagen types are distributed throughout the body.
• Buyers of expensive supplements tend to already eat well and use quality skincare, making it hard to isolate the supplement's effect.

A protein-rich, nutritious diet is a more effective approach, she advises. The one genuine edge: if someone has a protein deficiency, a collagen supplement may act as a basic protein source. Both experts urge patients to consult a doctor before taking any over-the-counter supplement, especially alongside prescribed medication.

In plain words: save the money unless a deficiency says otherwise.

What the experts recommend instead

Both guests backed a simple, evidence-led routine: cleansing, sunscreen every morning, and vitamin A at night. Pricey products don't guarantee better results, they stressed.

Sunscreen is the priority. Daily SPF 30–50 is, in their words, the most crucial anti-ageing product available — it protects the skin barrier and prevents collagen damage in the first place.

On retinoids, they were specific. Vitamin A supports skin cell turnover but must be introduced gradually, once or twice weekly, to avoid irritation. UK regulations cap over-the-counter retinoid concentrations at 0.3%.

Menopause, LED masks and the honest gaps

Hormonal shifts during menopause — particularly falling oestrogen — can trigger dryness, sensitivity and even adult acne, the pair explained. Routines often need revising to include more hydrating actives such as hyaluronic acid and ceramides.

LED masks drew a measured verdict. Trials have noted modest improvements in wrinkle reduction, but long-term clinical evidence remains limited.

The through-line of the episode is consistency over hype: daily SPF, gradual retinoid use and a decent diet beat any powder or gummy on the current evidence, and stronger independent research will be needed before oral collagen earns a place in that line-up.