Fish collagen – bioavailability, sources and use in daily supplementation

What exactly is fish collagen and why has it become such a popular choice in supplementation? Find out how it differs from bovine collagen, what the research says about its bioavailability, and how to use it correctly.

Collagen is the most abundant protein in the human body – it accounts for around one-third of total protein mass. It forms the structural framework of the skin, bones, tendons, ligaments, cartilage and blood vessels. As we age, the body’s natural rate of collagen synthesis declines, leading to visible changes in the skin’s appearance and slow-moving processes within connective tissues. It is precisely this natural mechanism that explains the growing popularity of supplements containing collagen – particularly fish collagen. It is worth noting, however, that collagen as a supplement ingredient does not have any health claims approved by the European Food Safety Authority. The scientific data are promising, but we interpret them with caution.

What is fish collagen and where does it come from?

Fish collagen is a protein obtained mainly from the skin, scales and bones of marine fish. During the production process, the raw material undergoes hydrolysis – that is, the enzymatic breakdown of long protein chains into shorter peptides. This produces what are known as collagen peptides (hydrolysed collagen), which are much more soluble in water and easier for the digestive tract to absorb than native collagen.

From a chemical perspective, fish collagen is primarily type I collagen – the same type that predominates in human skin, bones and tendons. Its amino acid profile, which is similar to that of human collagen, combined with the smaller size of the peptide molecules produced by hydrolysis, is one of the main reasons why fish collagen is often chosen as one of the better-tolerated sources of collagen in supplementation.

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Fish collagen vs beef collagen – key differences

The most commonly compared sources of collagen in supplements are fish (marine) collagen and beef collagen. Both provide the amino acids characteristic of collagen – glycine, proline and hydroxyproline – but differ in their collagen type profile.

Fish collagen mainly contains type I, whilst bovine collagen is a mixture of types I and III. In terms of particle size following hydrolysis, fish collagen peptides are generally slightly smaller, which, according to research, may result in better absorption. Fish collagen also has the advantage of coming from a source that is not usually part of a typical daily diet – so it is easy to supplement in the form of a dietary supplement.

What research says about collagen and the skin, hair and joints

Research into hydrolysed collagen supplementation focuses mainly on three areas: the condition of the skin, hair and nails, and joint comfort. Some clinical trials suggest that regular supplementation with collagen peptides may have a beneficial effect on skin parameters such as hydration and elasticity, as well as on joint comfort in people with age-related or exercise-related complaints.

These studies vary in terms of methodology, dosage and duration; therefore, their results should be interpreted with caution. However, the most significant limitation from a European perspective is that collagen does not have any approved health claims in the EFSA register – this means that no specific benefits may be attributed to this ingredient in marketing communications. Those interested in supporting joint comfort will also find information in the article on Boswellia serrata.

Vitamin C as a co-factor in collagen synthesis

This is the only area of collagen metabolism where an authorised health claim applies. Vitamin C contributes to the normal formation of collagen – and this claim specifically refers to collagen in relation to the normal condition of bones, cartilage, gums, skin, teeth and blood vessels.

The mechanism is well described biochemically. Vitamin C is an essential cofactor for two enzymes – proline and lysine hydroxylases – which are responsible for stabilising the collagen triple helix. Without an adequate supply of vitamin C, the synthesis of properly structured collagen in the body is impaired. This is why many people who take collagen supplements choose to take vitamin C at the same time – there is a physiological rationale for this. You can find out more about this vitamin in the article on ascorbic acid.

Fish collagen dosage – how much per day and for how long

In clinical trials on collagen peptides, doses ranging from 2.5 to 15 g per day were used, with the most common doses being around 5–10 g. Manufacturers usually recommend 5–10 g per day, taken as a single dose or in two portions. The powder form allows for flexible dosing – from a scoop to a full spoonful, depending on your needs.

Fish collagen powder can be dissolved in water, tea, juice, a smoothie or your morning coffee – it is virtually tasteless or has a very subtle flavour. Some people mix it with a drink containing vitamin C, which allows both ingredients to be consumed at the same time. Collagen supplementation is a long-term process – it is usually recommended to take it regularly for at least 8–12 weeks before any noticeable changes can be expected.

[tip: Fish collagen combines well with vitamin C, which contributes to normal collagen formation. It can be dissolved in water with lemon juice or mixed with a serving of a drink containing vitamin C.]

Who might benefit from fish collagen

Fish collagen is a supplement primarily aimed at adults who wish to supplement their daily diet with an easily absorbed source of collagen peptides. It may be an interesting choice for middle-aged people (when natural collagen synthesis slows down), for physically active people who put strain on their musculoskeletal system, and for those who care about the condition of their skin and hair.

[note: Vitaler’s fish collagen is pure hydrolysed collagen powder – free from artificial flavourings, sweeteners and preservatives. The convenient powder form allows for flexible dosing and mixing with your favourite drinks.]

Safety, allergies and contraindications

Fish collagen is well tolerated by most adults. The most significant contraindication is a fish allergy – people allergic to fish proteins should not take fish collagen supplements, despite the hydrolysis process. In such cases, bovine collagen is an alternative.

Collagen supplementation is not recommended for pregnant or breastfeeding women without consulting a doctor, nor for children. People taking long-term medication should speak to their doctor before introducing a new supplement into their daily routine. You’ll find a wider selection of health-supporting supplements in the Specialist and Vitamins categories.

[Warning: People with an allergy to fish or seafood should not take fish collagen supplements. Despite the hydrolysis process, trace amounts of allergenic proteins may remain in the product.]

Summary: Fish collagen is a hydrolysed protein derived mainly from the skin and scales of marine fish, providing type I collagen peptides with good solubility and bioavailability. Research into its supplementation focuses on skin and hair condition and joint comfort, although collagen does not have any approved EU health claims. Combining it with vitamin C is physiologically justified – vitamin C is the only ingredient in this group to have an approved claim regarding its contribution to normal collagen formation. A typical dose is 5–10 g per day, taken regularly for at least 8–12 weeks.