Marine vs Bovine Collagen UK: Comparing Types, Doses and Price Per 10g

Collagen is now one of the biggest categories in the UK supplement aisle and one of the least clearly labelled. Powders, sticks, gels, gummies, liquids and capsules, at prices that range from about the same as whey to several times it, with front-of-pack wording that tends to be vague because the rules require it to be. This guide is about the things on the label that genuinely differ.

Start with the rule that shapes the whole category: there are no authorised health claims for collagen in Great Britain. None for skin, none for joints, none for hair or nails. A compliant label therefore describes what is in the tub and stops. That is why so many products lean on the word "beauty" and on pictures rather than sentences. It also means that when a listing does tell you what collagen will do, you are looking at a seller who is not following GB rules.

What you can compare is composition, dose and price. So let us.

What "hydrolysed collagen peptides" means

Collagen in its native form is a large, tough protein — it is the stuff of skin, tendon and bone. Boiled, it becomes gelatine, which sets when cold. Hydrolysed further, it becomes short chains called peptides, which dissolve in cold liquid and do not gel.

That is the practical difference between a collagen supplement and a bag of gelatine: solubility. Almost everything sold as a collagen supplement is hydrolysed. If a powder clumps or sets in a cold drink, it is not properly hydrolysed and you have bought the wrong thing.

Some labels quote an average molecular weight in daltons — typically around 2,000 to 5,000 Da for peptides. It is a legitimate specification and a sign the brand knows its raw material. It is not something to pay a large premium for on its own.

Marine vs bovine: what actually changes

Marine

Made from fish skin and scales. It is predominantly type I collagen, dissolves readily, and is the pescatarian-friendly option. It costs more per gram than bovine, consistently. Some marine powders carry a faint fishy note in water — far less than they used to, but it is why flavoured versions are popular. Obviously unsuitable if you have a fish allergy.

Examples across the range include Applied Nutrition Marine Collagen, Refined Nutrition Ultra Marine Collagen, Sunna Supplements Marine Collagen, KIKI Health Pure Marine Collagen and single-serve options such as Osavi Marine Collagen from wild cod.

Bovine

Made from cattle hide and bone. Typically a mix of types I and III, cheaper per gram, essentially neutral in taste, and the default in most large unflavoured tubs. Applied Nutrition Collagen Peptides and Optimum Nutrition Collagen Peptides are typical.

Undenatured type II

A different product entirely, usually from chicken sternum cartilage and sold at around 40 mg per capsule rather than 10 g per scoop — NOW Foods UC-II is the familiar example. Because it is deliberately not hydrolysed, comparing its milligram dose to a peptide powder's gram dose is meaningless. They are not competing products even though they sit on the same shelf.

The type numbers on the front are mostly decoration

"Types I, II, III, V and X" looks impressive on a tub. In a hydrolysed peptide powder it tells you very little, because hydrolysis breaks the original structure down into short chains. What you are buying is a peptide profile, not intact type III collagen.

The type number is meaningful in exactly two situations: for undenatured type II, where keeping the structure intact is the entire point of the product, and as a rough shorthand for the source (marine skews type I, bovine gives I and III). Otherwise, treat it as packaging.

Serving size: the number that decides value

UK labels typically land somewhere between 2.5 g and 10 g of collagen per serving for peptide powders, and that four-fold range is where most of the price confusion lives.

Read the serving size on the back, not the pack weight on the front. A 250 g tub at 5 g per serving is 50 servings; a 300 g tub at 10 g per serving is 30. The bigger tub can easily be the worse buy.

Then convert to cost per 10 g of collagen, which puts powders, sticks, gels and capsules on the same scale:

price ÷ (grams of collagen per serving × servings per pack) × 10

Run that on a capsule product and the result is usually startling. Capsules are convenient, but reaching a 10 g dose can mean swallowing a lot of them, which is why capsule collagen is best thought of as a low-dose format rather than a compact version of the powder. Sticks and gels such as Applied Nutrition Marine Collagen Gels sit in between: dearer per gram, but genuinely portable.

Why vitamin C keeps turning up next to it

You will see a lot of "collagen & vitamin C" products, such as Bulk Marine Collagen & Vitamin C. There is a straightforward regulatory reason for the pairing.

Collagen has no authorised claim. Vitamin C does — including that vitamin C contributes to normal collagen formation for the normal function of skin, bones, cartilage, gums, teeth and blood vessels. So a product containing a significant amount of vitamin C may legally print a sentence with the word collagen in it, which a pure collagen powder cannot.

That is worth understanding rather than being cynical about. The vitamin C claim is real and authorised; it is simply a claim about vitamin C. If you already take a multivitamin or eat fruit, you may be paying a premium for something you have covered — our multivitamin guide covers that side.

One thing collagen is not

Collagen is a protein, and a 10 g scoop will show up on a nutrition panel as roughly 9 g of protein. But it is an incomplete protein — notably low in tryptophan — so it is a poor substitute for whey, egg or a good plant blend if your aim is hitting a daily protein target. Count it as an extra rather than as part of your protein budget. If protein is the actual goal, our protein powder guide is the more useful page.

A short buying checklist

1. Source: marine, bovine, or undenatured type II — and does that fit your diet and allergies?
2. Hydrolysed peptides, and does it dissolve cold?
3. Grams of collagen per serving, from the back of the pack.
4. Cost per 10 g of collagen across every format you are considering.
5. Flavoured or unflavoured, depending on whether it is going into coffee or water.

Have a look

Powders, sticks, gels, gummies and capsules are together in our Collagen & Beauty range, inside the wider Vitamins & Health section. If you want the shorter version first, our plain-English introduction to collagen is a five-minute read.

A quick note

This article is general information, not medical or nutritional advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle, and should not be used to prevent or treat any illness. Always read the product label, do your own research, and speak to a qualified doctor, pharmacist or registered nutritionist before starting a new supplement — especially if you are pregnant, breastfeeding, under 18, taking medication or managing a health condition.