Skin & beauty

Do collagen products actually improve your skin?

By Lena Filatova · 14 June 2026 · 5 min read

🇺🇦 Читати українською

Collagen is the scaffold that keeps skin firm and elastic — and from your mid-twenties you make a little less of it each year. Here's what the evidence actually supports, and what's mostly marketing.

Collagen is the most abundant protein in the body. It forms the structural scaffold that gives skin its firmness, elasticity and plumpness. From the mid-twenties, the body produces roughly 1% less each year. In perimenopause and beyond, that decline accelerates — falling oestrogen removes one of collagen's key production signals, which is why skin often changes noticeably around that time.

The skincare industry has built a large market around this biology. Whether any specific product can meaningfully slow or reverse that decline depends on how it works — and not all of them do.

Why collagen creams can't rebuild skin

The collagen molecule is large — around 300,000 daltons. Research into skin permeability has established that the skin's outer barrier only allows molecules smaller than 500 daltons ↗ to pass through. A collagen cream or serum cannot deliver collagen into the dermis; the physics don't allow it.

What a collagen cream can do is function as a moisturiser. It reduces water loss from the skin's surface, which temporarily plumps fine lines and improves texture. That's useful — but it's the same mechanism as any good humectant or barrier cream. Nothing wrong with them; they are just not doing what the marketing often implies.

If you want to support collagen synthesis in the dermis, the topical ingredients with the strongest evidence are retinoids (derivatives of vitamin A) and vitamin C. A 2025 systematic review and meta-analysis of clinical trials on tretinoin ↗ confirmed that retinoids measurably increase collagen production and improve photodamaged skin — they remain the most evidence-backed topical ingredient for skin ageing. Vitamin C supports the hydroxylase enzymes that form and stabilise collagen — it is a cofactor, not a source, but without enough of it the process stalls.

What the evidence says about collagen supplements

Oral supplements are a more interesting — and more complicated — story. Hydrolysed collagen peptides, the form found in most powders and capsules, are broken into fragments small enough to be absorbed in the gut. There is reasonable evidence that some of those fragments reach the skin and stimulate fibroblasts, the cells responsible for producing collagen and elastin.

A 2024 meta-analysis covering 26 randomised controlled trials and 1,721 participants ↗ found consistent improvements in skin hydration and elasticity with hydrolysed collagen supplementation. The original landmark trial by Proksch et al. ↗ — 69 women, 8 weeks, 2.5–5g daily — showed statistically significant improvements in skin elasticity, and its findings have held up across subsequent research.

There is, however, an important caveat. A 2025 meta-analysis in the American Journal of Medicine ↗ examined 23 trials and found that when studies were separated by funding source, industry-funded trials consistently showed significant benefits — while independently-funded trials showed no effect. This doesn't mean the supplements don't work, but it does mean the evidence base deserves more scrutiny than the marketing suggests.

The most honest summary: the effects are plausible, the supplements appear safe, and some trials show real improvements. But the evidence is not as solid as it is often presented, and the question of who funded the research matters more here than in most areas.

The foundations that matter more

Before spending on supplements, it is worth checking whether the building blocks are in place. Collagen synthesis depends on specific nutrients, and a shortfall in any of them limits what the body can produce.

Vitamin C ↗ is the most critical. The enzymes that form and stabilise collagen cannot work without it — made vivid by the fact that scurvy causes skin breakdown and wound-healing failure. You don't need megadoses; the UK Reference Nutrient Intake is 40mg per day. Good sources include bell peppers, kiwi, citrus fruit and broccoli. A 2024 randomised trial found that combining collagen with vitamin C ↗ improved dermis density and skin texture more than placebo — suggesting the two work better together than either alone.

Zinc supports collagen-producing enzymes and wound repair. Mild deficiency is common, particularly in women eating a predominantly plant-based diet. Rich sources include meat, pumpkin seeds, legumes and wholegrains.

Copper is required for lysyl oxidase, the enzyme that cross-links collagen fibres to give skin its structural strength. Nuts, seeds, shellfish and liver are the richest sources.

Protein is what collagen is made from. The body cannot build it without adequate amino acids — and women in midlife often eat less protein than they need, particularly when reducing overall calories.

A note for perimenopause

Oestrogen plays a direct role in collagen production. A 2025 narrative review in the Journal of Cosmetic Dermatology ↗ — drawing on five decades of research — confirmed that skin collagen content falls at roughly 1–2% per year in the early postmenopausal period, that skin thickness and barrier function decline alongside it, and that this is driven by falling oestrogen rather than age alone. The same review found evidence that HRT can partially restore collagen content, elasticity and hydration in postmenopausal women.

The evidence for HRT's skin benefits is growing, but it remains secondary to the better-established benefits for vasomotor symptoms and bone protection. If you are in or approaching perimenopause and noticing significant changes in skin firmness or texture, it is worth raising the question of hormonal health with your GP or a menopause specialist alongside any conversation about skincare.

What the research says

The information on this website is educational and is not medical advice. Please consult your doctor if you have any doubts or further questions.