Collagen for Hair Growth: Does It Actually Work?
Collagen for hair growth is one of the most searched topics in the supplement space, and one of the most misunderstood. Hair is made from keratin, not collagen, which leads many people to dismiss collagen supplements as irrelevant for hair. The real relationship is more nuanced, and this guide covers it honestly: what the evidence shows for hair, what it shows (and doesn't) for eyelashes, and what to realistically expect.
Does collagen help hair grow?
Hair follicles sit within the dermis, the collagen-rich layer of skin, anchored in a structure called the dermal papilla. Age-related collagen decline affects this supporting tissue as it does skin everywhere else. Marine collagen peptides are rich in glycine, proline and hydroxyproline, and keratin synthesis draws on this amino acid pool; when peptides are digested, those amino acids become available. That is the honest mechanism: not collagen converting into hair, but raw material supply, particularly relevant if your diet is low in protein.
The closest relevant clinical evidence is a randomised, double-blind, placebo-controlled trial of low-molecular-weight collagen peptides in adults with damaged scalp hair, which reported improvements in hair shine, strength, thickness and density versus placebo. That is encouraging and it is a real trial, but it is one study in one hair condition, so the site-wide framing stands: the hair evidence is emerging, and we won't call it more than that.
What the research shows, honestly labelled
| Outcome | Evidence | Typical timeframe |
|---|---|---|
| Hair strength, shine, thickness and density | Emerging: one placebo-controlled trial in damaged scalp hair | Months, following the hair growth cycle |
| Reduced shedding | Commonly reported by users; not established in collagen trials | 3 to 6 months to judge fairly |
| Scalp skin quality | Extrapolated from the well-established general skin research | 8 to 12 weeks |
| Faster growth rate | Not established | - |
What about eyelashes?
Search for collagen and eyelashes and you'll find plenty of confident promises. Here's the more honest starting point: there are no clinical studies looking specifically at collagen supplementation and eyelash growth. Like scalp hair, lashes are primarily keratin, and collagen's relevance is the same indirect one, amino acids that may serve as keratin substrates plus the collagen-rich skin around the follicles. That is a genuine biological connection, but a connection, not a proven outcome. The scalp-hair trial above studied scalp hair, and one trial in a different hair type doesn't transfer automatically. There is also currently insufficient evidence that oral collagen protects lash follicles from oxidative damage, whatever lash marketing implies, and no good trials establishing lash timeframes at all.
Lash characteristics change with normal ageing, but the link between age-related collagen decline and lash thinning has not been demonstrated, and sudden or significant lash loss has other possible causes (thyroid conditions, skin conditions around the eyelid, some treatments) worth raising with a GP rather than supplementing past.
What genuinely protects the lashes you have is mechanical, because lashes are damaged by handling far more often than by nutrition:
- Avoid rubbing, pulling or excessively handling your eyelashes
- Remove eye makeup gently to reduce mechanical stress and breakage
If thinning lashes bother you cosmetically, conditioning lash serums can help the appearance of existing lashes, and a pharmacist or GP can advise on options for significant loss. One customer experience we can share honestly, as an experience rather than a promise:
Individual experiences vary, and anecdotes aren't evidence in the scientific sense, but they're part of the honest picture too.
What to look for in a collagen supplement for hair
- Hydrolysed peptides, stated in grams per serving. There is no established minimum dose for hair; the verified hair trial used low-molecular-weight peptides, and the general research range is 2.5 to 10g
- A named, studied ingredient such as Naticol®, rather than unnamed "marine collagen"
- Vitamin C in the formula, which contributes to normal collagen formation and supports iron absorption
- Independent testing: Informed Choice certification means every batch is tested for over 250 prohibited and potentially harmful substances
- A format you'll take daily for months, because hair outcomes follow the growth cycle and consistency decides everything
Each daily sachet of Kollo Premium Liquid Marine Collagen delivers 10,000mg of Naticol® peptides, at the top of the researched range, with vitamin C, B vitamins (B12 contributes to the reduction of tiredness and fatigue) and l-lysine, Informed Choice certified. The evidence-supported case for taking it is skin elasticity and hydration over 8 to 12 weeks, with hair strength commonly reported and the trial evidence above emerging; any lash benefit sits in the possible-but-unproven column, and we'd rather you buy knowing that.
More from Kollo: does collagen shampoo work? [CONFIRM SLUG], complete guide to liquid marine collagen, complete guide to collagen powder, complete guide to menopause supplements, and complete guide to electrolytes.
Kollo Health was co-founded by Jenni Falconer - TV presenter, Smooth Radio breakfast host, ten-time London Marathon runner and host of the RunPod podcast. Read her story and why she created Kollo.
