How collagen could help your hair
Marine collagen is often talked about as a supplement for hair — and it's a fair area to ask about. Hair changes are common through the years (thinning, slower growth, more shedding, changes in texture), and it's natural to look at nutrition and supplements as part of the picture. This article looks honestly at what the evidence supports, what it doesn't, and where hair concerns are better addressed by seeing your GP.
Why hair changes over time
Hair follicles are embedded in a collagen-rich part of the skin called the dermis. From around the age of 25, the body's natural collagen production begins to decline at roughly 1% per year — and this decline accelerates around menopause as oestrogen (which supports collagen production) falls. As collagen in the dermis reduces, the structural support around hair follicles can weaken, contributing to finer, slower-growing hair with increased breakage.
Beyond collagen, hair is also affected by:
- Hormones — thyroid function, oestrogen (particularly during pregnancy, postpartum and menopause), androgens
- Nutrition — iron, protein, zinc, biotin, and adequate overall calorie intake
- Health conditions — anaemia, thyroid disorders, PCOS, autoimmune conditions
- Stress and illness — telogen effluvium (a temporary shift in the hair growth cycle) commonly follows physical or emotional stress
- Medications — including some blood pressure treatments, anticoagulants, chemotherapy
- Styling and heat damage — a genuine, underrated factor
All of which is to say: hair changes have many causes, and marine collagen supplementation is one piece of a bigger picture, not a fix-all.
What the evidence shows on collagen and hair
The core mechanism is straightforward. When you take hydrolysed marine collagen, it's broken down during digestion into amino acids and small peptides which are absorbed and used across many tissues in the body. Collagen peptides provide the amino acid building blocks — particularly glycine, proline and hydroxyproline — that the body uses in the production of the many proteins it needs, including keratin (the primary structural protein in hair).
Some published research suggests marine collagen supplementation may support hair thickness, shedding and general condition. Kollo customers often report improvements in hair condition within 8-12 weeks of consistent daily use. That said, the evidence base for hair is smaller and less developed than the evidence for skin, so we'd frame collagen as one supportive daily habit — not a hair transformation product.
Marine collagen through different life stages
In your 20s and 30s
Hair is often at its strongest here, but early collagen decline has already begun. Daily marine collagen can be part of a preventative approach alongside good general nutrition, gentle styling and sun protection.
In your 40s and beyond
The pre- and post-menopause years bring the sharpest collagen changes and often the most noticeable hair changes for many women. This is where marine collagen makes particular sense as part of a broader menopause wellness routine. Our menopause supplements with HRT guide covers how supplements fit alongside medical treatment, and our guide to collagen during menopause covers the broader picture of what collagen can and can't help with at this stage.
Postpartum hair shedding
Many women experience noticeable hair shedding around 3-4 months after giving birth — a normal but distressing form of telogen effluvium driven by hormonal changes. Hair typically returns to normal over 6-12 months. If postpartum shedding is significantly affecting you, speak to your GP or health visitor.
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Premium Liquid Marine Collagen
10,000mg of clinically studied marine collagen daily — for visibly smoother, firmer, more hydrated skin in as little as 28 days.
Shop Liquid Collagen →What actually supports hair (beyond collagen)
Since hair depends on many factors, the things that reliably help are the foundations rather than any one supplement:
- Adequate protein intake — hair is protein; low overall protein intake can affect hair quality
- Iron — one of the most common deficiencies linked to hair thinning, particularly in women. Get your ferritin checked if you're concerned
- Zinc — supports normal hair maintenance (authorised EU health claim)
- Biotin — contributes to the maintenance of normal hair (authorised EU health claim), though the effect in non-deficient people is limited. See our biotin and collagen guide — and note the important lab test interference issue with high-dose biotin
- Vitamin D — deficiency is associated with hair loss in some studies
- Gentle care — avoiding excessive heat, tight styling, harsh chemical treatments
- Stress management — chronic stress can trigger telogen effluvium; sleep, movement and stress management genuinely matter
- Sun protection — UV damages both skin and hair; a hat matters
A word on Kollo Premium Liquid Marine Collagen
Kollo delivers 10,000mg of Naticol® marine collagen peptides per daily sachet, alongside vitamin C, a B vitamin complex (B1, B5, B6, B12) and l-lysine. Every batch is Informed Choice certified — independently tested for over 250 prohibited and potentially harmful substances. Not suitable for anyone with a fish allergy.
We'll be honest about how we position Kollo: it's a well-formulated daily supplement with strong evidence for skin and emerging evidence for hair, joints, bones and nails. It isn't a hair loss treatment, and if you have significant hair loss it's worth seeing your GP before starting any supplement so any underlying cause can be identified and treated.
Frequently Asked Questions
Can collagen help with hair loss?
Marine collagen supplementation may support hair condition — many people report reduced shedding and improved feel over 8-12 weeks of consistent daily use. It is not a treatment for medical causes of hair loss (like iron deficiency, thyroid dysfunction, PCOS, alopecia areata or androgenetic alopecia). If you have significant or unexplained hair loss, please see your GP — treating an underlying cause will help far more than any supplement.
Does collagen reduce grey hair?
No. Greying is primarily genetic and related to melanocyte function, and there is no evidence that oral collagen supplementation affects greying. Any product marketed on that basis is overclaiming.
How long does it take to see hair results from collagen?
Most people who notice hair changes from consistent marine collagen supplementation report them over 8-12 weeks. Consistency matters more than timing — pick a routine you can stick with daily.
How much collagen should I take for hair?
The clinical research on skin outcomes consistently uses around 10g (10,000mg) of hydrolysed marine collagen peptides per day. Emerging hair research uses similar doses. Kollo Premium Liquid Marine Collagen delivers 10,000mg per daily sachet.
Should I take biotin as well as collagen for hair?
Biotin has an authorised EU health claim for contributing to the maintenance of normal hair. Many people take both. One thing to know: high-dose biotin can interfere with common lab tests (thyroid function, cardiac troponin, hormone assays) — always tell your GP and lab technician if you take biotin before blood work. See our biotin and collagen guide for more.
More honest guides on collagen and specific health situations: biotin and collagen together, menopause supplements with HRT, collagen during menopause, collagen and warfarin, and collagen and weight management.
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.
