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What are the benefits of marine collagen?

7 min read time

Written by: Aaliyah Nelson

Medically reviewed by: Aaliyah Nelson

Published 06/10/2026 Updated 06/10/2026

Key takeaways

What it is: Hydrolysed fish collagen, broken into small peptides that are absorbed quickly.
Best-researched benefit: Skin hydration and elasticity, with results possible after about 8 to 12 weeks of consistent use.
Promising, but early: Bone health in postmenopausal women, knee osteoarthritis and sleep. Evidence for hair, nails, gut and heart is limited.
Use it sensibly: It's a supplement, not a replacement for whole foods

Collagen is one of the body’s most abundant proteins, making up around 30% of total protein, and it provides structure and elasticity to the skin, joints, tendons, ligaments, muscles, and more.

Marine collagen supplements have become popular for skin, joint and general wellness, and researchers are still studying whether they offer statistically significant benefits.

What is marine collagen?

Marine collagen is hydrolysed collagen derived from fish scales, bones and skin. The fish parts are cleaned and refined, then broken down by a process called enzymatic hydrolysis.

This splits the long collagen chains into much smaller molecules known as peptides. Because the peptides are so small, they can be absorbed more quickly, without being fully broken down into amino acids during digestion.

Marine collagen is mostly type 1 collagen, which is found throughout the body, including the joints, skin, nail beds and muscle fibres.

From our 20s or 30s, collagen production falls by around 1% a year. External factors can speed this up, including UV exposure, smoking, alcohol, hormonal changes such as menopause, and a diet high in processed and refined sugars.

“But can’t I get collagen from my food?” You can, but dietary collagen is too large to be absorbed as-is, so your body breaks it down into amino acids first. The supposed advantage of marine collagen is that it is already in the form of small peptides, which can be absorbed quickly.

What does marine collagen do?

Marine collagen may stimulate fibroblasts, the cells that make collagen and elastin. This doesn’t mean you’ll see an immediate skin boost; results require long-term and consistent use.

Collagen supplements can’t be targeted to a particular area; your body decides where it uses the amino acids and peptides, whether that is the skin, muscles, or joints.

Some research suggests marine collagen may improve skin hydration and elasticity. Marine collagen is also often paired with vitamin C, which acts as a cofactor for the enzymes that help bind collagen fibres together. Vitamin C is also an antioxidant that helps reduce oxidative stress and protect fibroblasts from damage.

Marine collagen benefits

Potential benefits include improved skin hydration and elasticity, joint repair and better muscle recovery.

Skin

Although the evidence on the benefits of collagen supplementation and its impact on skin hydration and condition is mixed, peptides may act as biological signals that prompt more protein production.

This can support the production of fibronectin, elastin and hyaluronic acid. Hyaluronic acid is a humectant, meaning it attracts water, which contributes to skin hydration. Based on current studies, you could notice results as early as 90 days of continuous use.

Hair

Hair is made of a different protein, keratin, not collagen; many other factors, such as hormonal changes and nutritional deficiencies, influence hair growth and quality. Some studies have shown improvements in hair condition after collagen supplementation.

Nails

Nails, like hair, are made of keratin. Unlike hair, though, the nail bed underneath is living tissue that supports nail growth. One study reported an 80% improvement four weeks after treatment ended, with nails also improving in appearance.

Joints & bone health

Collagen supplementation may help when collagen is depleted, or joints are affected by wear and tear or hormonal changes. In one study of postmenopausal women, participants showed 4.2% higher bone mineral density in the spine and 7.7% in the femoral neck after 12 months of collagen supplements.

A study also suggested that collagen improved joint function and pain scores in people with knee osteoarthritis.

Gut health & digestion

Collagen contains amino acids the body uses to build the gut lining, which may offer some benefit.

Muscle recovery & performance

Collagen supplements can help with muscle recovery and repair because of their amino acid structure. But collagen is an incomplete protein source, so use collagen supplements as part of a balanced diet.

Sleep & relaxation

Glycine, a major component of collagen, has been tested for its sleep benefits. In one study, participants reported improved focus and less daytime fatigue, along with fewer sleep disturbances at night.

If you’re considering collagen supplements for sleep, 15g before bed is a typical dose.

Heart & metabolic health

Collagen supplements may offer potential benefits for heart and metabolic health.

Specifically, it can support the circulatory system, as blood vessels need elasticity to withstand blood pressure.

Weight loss

For weight loss, collagen is a protein that can make you feel full throughout the day. But collagen is an incomplete source of amino acids, so use it as part of a balanced diet and not as a replacement for whole foods.

Marine collagen through perimenopause & menopause

Hormonal changes during perimenopause and menopause may make collagen worth considering. Oestrogen production falls during menopause, which affects bone mass and muscle density. Collagen supplementation may help support these areas.

Conclusion

Marine collagen offers benefits, most notably for skin hydration and elasticity. There are also promising signs for bone health in postmenopausal women, joint function in knee osteoarthritis, and sleep.

It also supports muscle recovery, and as a protein it may help you feel fuller for longer. It is an incomplete protein, though, so it should sit alongside a balanced diet rather than replace whole foods.

FAQs

What does marine collagen do?

Marine collagen is hydrolysed into small peptides that may support skin hydration and elasticity, as well as joint, bone and muscle health. People most commonly take it for its skin benefits. The peptides may encourage the body to produce more collagen and other proteins. Most research focuses on the skin, but findings are mixed on whether the benefits are statistically significant.

How long does marine collagen take to work?

Most studies report results after about 8 to 12 weeks of consistent daily use, and some after around 90 days, although this varies from person to person.

Is marine collagen better than bovine collagen?

Whether one is better than the other depends on you. Marine collagen is primarily type 1 collagen, whereas bovine collagen is a combination of type 1 and type 3. Both are among the most abundant collagen types in the body, so rather than comparing the two, decide what is right for you. For example, if you follow a pescatarian diet or have dietary restrictions based on culture or belief, that can help you decide which suits you best.

The two may also differ in size: marine collagen peptides are typically smaller, which allows quicker absorption. They may also differ in price, so choose whichever works best for you.

How much marine collagen should I take a day?

Follow the directions on the product. Typical doses are 5 to 10 grams a day.

Is marine collagen safe? Are there side effects?

Marine collagen is typically well tolerated, but some people may experience side effects such as digestive discomfort. Check the label for allergens, especially if you have a fish allergy, as marine collagen may cause allergic reactions in some people.

How we reviewed this article:

The Role of Fibroblasts in Skin Homeostasis and Repair. (2024) PubMed Central. [Accessed 5 October 2026]
Effects of collagen-based supplements on skin’s hydration and elasticity: a systematic review and meta-analysis. (2023) PubMed. [Accessed 5 October 2026]
Efficacy of Vitamin C Supplementation on Collagen Synthesis and Oxidative Stress After Musculoskeletal Injuries: A Systematic Review. (2025) PubMed Central. [Accessed 5 October 2026]

Current version
6th Oct 2026 Medically reviewed by: Aaliyah Nelson, BSc (Hons) Nutritionist
6th Oct 2026 Written by: Aaliyah Nelson, BSc (Hons) Nutritionist

Medically reviewed by:

Aaliyah Nelson BSc (Hons) Nutritionist

I am a nutritionist with an interest in helping people feel comfortable and healthy.

Last reviewed: 6th Oct 2026

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What are the benefits of marine collagen?

Key takeaways

What is marine collagen?

What does marine collagen do?

Marine collagen benefits

Skin