Hydrolysed marine collagen: what it means on the label, and what people who actually took it say

Updated on 12 November 2026 with 4 studies published between 2018 and 2024, and 3,711 reviews from people who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen, written between October 2018 and September 2026.

Before going further with marine collagen, one person stopped to ask in their review what the Low DA on the pack actually means. Others came to it with thinning hair, nails that kept breaking, aching joints, or skin that had lost its plumpness. Here’s what hydrolysed marine collagen means on the label, and what it was like for the people who took it.

We went through every review of British Supplements’ Clean Genuine Hydrolyzed Marine Collagen. That’s 3,711 reviews, written between October 2018 and September 2026 by people in the UK. Skin comes up most, then hair, then nails, then joints, and a few wrote about their bones.

If marine collagen itself is new to you, start with what marine collagen is and where it comes from.

Here’s what the 3,711 reviews talk about:

What they wrote about	Reviews
Skin	1,100
Hair	1,058
Nails	838
Joints	600
Bones	78
No side effects	41
A side effect	28
Taking it with vitamin C	5

What is hydrolysed collagen?

Hydrolysed collagen is collagen broken into much smaller pieces, according to the Frontiers in Nutrition trial published in August 2024, whose fish collagen was made by breaking gelatin down with enzymes. Three people who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen wrote about the forms they’d had it in, from powder in coffee to capsules.

Think of whole collagen as a long rope. Hydrolysing it cuts the rope into short bits. Here’s what two of the three wrote:

What does hydrolyzed collagen mean?

Hydrolyzed collagen means collagen that’s been cut into small pieces before you take it, according to the Frontiers in Nutrition trial, which describes its fish collagen as gelatin broken down with enzymes. Hydrolyzed collagen meaning and hydrolysed collagen meaning are the same thing, spelt the US way and the UK way.

What does the research say about hydrolysed collagen?

The research gave hydrolysed collagen made by breaking fish collagen down with enzymes. That’s according to the Frontiers in Nutrition trial (August 2024), which calls it a collagen hydrolysate, and the Nutrients trial (June 2018), whose fish collagen hydrolysate was made the same way.

Collagen hydrolysate is the papers’ word for hydrolysed collagen, and the name people search alongside it. Both trials gave hydrolyzed collagen supplements, not whole collagen. The Nutrients trial also notes that collagen can make up more than 70% of the dry weight of the skin’s deeper layer.

What are collagen peptides?

Collagen peptides are the small pieces collagen is broken into, and the Low DA 1,000-2,000 on British Supplements’ pack is their size in Daltons. A Dalton is a unit for weighing molecules, so 1,000 to 2,000 Daltons is how heavy each piece is, according to the pack. Jen M. asked about it, and 3 more wrote about the size of the pieces or what’s in each capsule.

Here’s what Jen M. wrote:

Hydrolysed collagen vs collagen peptides is one thing under two names on a label: collagen broken into small pieces. Marine collagen peptides are those pieces made from fish.

Is collagen a peptide?

No, collagen on its own isn’t a peptide. Whole collagen is a protein, and peptides are the small pieces it’s broken into, like the 1,000 to 2,000 Dalton pieces on British Supplements’ pack.

What does the research say about collagen peptides?

The fish collagen peptides in the research were about 2,000 Daltons on average. That’s according to the Frontiers in Nutrition trial (August 2024), which gave fish collagen peptides. The molecular weight of hydrolyzed collagen peptides depends on how far the collagen was broken down, according to that trial, which calls the pieces it tracked in the blood bioactive peptides.

Can your body absorb collagen?

Yes, your body can absorb collagen, according to a trial published in Frontiers in Nutrition in August 2024, which found collagen pieces in the blood of 6 adults within hours of one drink. Nobody who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen wrote about it either way.

What does the research say about absorbing collagen?

Absorbing collagen from one drink of fish collagen raised hydroxyproline, a collagen building block, to about 7 times its starting level in the blood. That’s according to the Frontiers in Nutrition trial (August 2024), run in 6 healthy adults and paid for by the company that makes the collagen it tested.

The 3 women and 3 men had the drink in water after an overnight fast, and gave blood at 1, 2, 3, 4 and 6 hours. Short collagen pieces, two or three building blocks long, turned up in their blood too. Whether you can absorb collagen orally, by mouth, is what that trial measured.

Hydrolysed collagen molecules aren’t too big to be absorbed, according to its authors, who write that the pieces get broken down further in the gut. Pig and cow collagen gave about the same amount of hydroxyproline as the fish, so the trial found no best absorbed collagen among the three.

Do you need vitamin C to absorb collagen?

No, you don’t need vitamin C to absorb collagen, according to the one trial that measured it: the Frontiers in Nutrition trial (August 2024) gave its collagen in plain water and still found collagen pieces in the blood. Taking it with vitamin C anyway is what 5 people who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen did, Magda G. among them. Here’s what three of the five wrote:

What does the research say about collagen and vitamin C?

The research on collagen and vitamin C gave vitamin C to everyone in one trial and to nobody in the other. That’s according to the Nutrients trial (June 2018), which put the same vitamin C in its collagen and placebo drinks, and the Frontiers in Nutrition trial, the one that measured absorption, which gave its collagen in plain water.

So neither tested whether you should take vitamin C with collagen. As for whether you can take collagen and vitamin C together, Magda G., Vivien M. and Maureen S. all take the two at once, and so do two more.

What is hydrolysed marine collagen good for?

Hydrolysed marine collagen was good for their skin, hair, nails, joints and bones, according to the people who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen. The ones who saw no difference were 28 for hair, 25 for skin, 15 for nails, 14 for joints and 1 for bones. Here’s what it did for them:

• Plumper skin, hair that stopped falling out and nails that stopped breaking, according to someone who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen, two and a half months in.
• The early signs of ageing faded, according to another, whose husband says they’re glowing.
• Nails got a lot better in the first week, according to a third.
• Relief in aching joints on the very first day, according to a fourth, who’d only bought it for hair loss.

Each has a page of its own: collagen for skin, collagen for hair, collagen for nails and collagen for joints. Here’s one person for each of the four:

What does the research say about what collagen peptides do?

Collagen peptides raised skin hydration more than a placebo across 18 trials, and elasticity across 19. That’s according to a review of 26 trials and 1,721 people from Taipei Medical University, published in Nutrients in April 2023. So in that review, collagen peptides benefits meant skin.

Is hydrolysed collagen safe?

Whether hydrolysed collagen is safe for you to take depends on what your GP or a pharmacist says. Forty-one people who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen wrote that they had no side effects, and 28 wrote about one.

Collagen peptides side effects are what those 28 wrote about, so we’ve counted them but left their names off. Here’s what three of the 41 wrote about hydrolyzed collagen side effects:

If you have a kidney condition, the Nutrients trial (June 2018) found that both kidney markers, creatinine and blood urea nitrogen, stayed in the normal range over 12 weeks. That’s what it checked on whether hydrolyzed collagen is safe for kidneys, and it left out anyone whose kidney tests were already abnormal.

Nobody who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen wrote about their kidneys. So anyone with a kidney condition should ask a pharmacist or GP before taking marine collagen.

Marine collagen is made from fish, and in British Supplements’ Clean Genuine Hydrolyzed Marine Collagen that fish is Pangasius. Two people who took it wrote about an allergic reaction, one of them allergic to one kind of fish.

The Nutrients trial left out anyone with a history of allergies. Whether you can be allergic to marine collagen is something those 2 wrote about from their own reactions, so anyone with a fish or shellfish allergy should ask a pharmacist or GP first.

If you’re going through the menopause, 131 women who’d already been through it took collagen peptides or a placebo for a whole year, and nobody had a side effect. That’s according to a trial published in Nutrients in January 2018.

None of the 149 people who wrote about the menopause in their reviews of British Supplements’ Clean Genuine Hydrolyzed Marine Collagen wrote about a side effect. What they wrote is on the page about collagen for menopause.

If you have IBS, Crohn’s or another gut condition, the Nutrients trial found no side effects in 12 weeks, and the Frontiers in Nutrition trial none after one drink. On collagen and IBS, three people who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen wrote about their gut, Lynda G. among them, and here’s what the other two wrote:

One more person with a gut condition wrote about the capsule’s other ingredients, so we’ve counted them but left their names off.

If you’re over 60, the Nutrients trial took women aged 40 to 60, and the Frontiers in Nutrition trial adults aged 19 to 50. Here’s what two people over 60 wrote:

Nobody in this group wrote about a side effect.

What does the research say about safety?

The trials found no side effects at all. That’s according to the Nutrients trial (June 2018), where blood tests, urine tests and blood pressure also stayed in the normal range over 12 weeks, and the Frontiers in Nutrition trial, where none of the 6 adults had one after a single drink.

Ask your GP or a pharmacist about what to avoid while taking marine collagen if you:

• take any medication or other supplements alongside it
• are pregnant or breastfeeding
• have a kidney or liver condition

Anyone with a fish allergy should not take it.

The pack adds three lines of its own: not to be taken by under 18s, do not exceed the recommended daily dosage, and keep out of reach of children.

What is the best hydrolysed marine collagen?

The best hydrolysed marine collagen is the one with reviews from people who actually took it and wrote what changed. That’s people with names and dates, not what’s printed on the pack. Here’s what three of the 3,711 who took British Supplements’ Clean Genuine Hydrolyzed Marine Collagen wrote:

FAQ

What is marine collagen hydrolysate?

Marine collagen hydrolysate is another name for hydrolysed marine collagen, according to the Nutrients trial (June 2018), which calls its fish collagen a collagen hydrolysate made with enzymes. What’s in British Supplements’ Clean Genuine Hydrolyzed Marine Collagen is “Collagen and thats it of course,” according to the product page.

Is hydrolysed marine collagen type 1 collagen?

Yes, hydrolysed marine collagen is type 1 collagen in British Supplements’ Clean Genuine Hydrolyzed Marine Collagen, according to the product page, which lists “Type 1”. The Nutrients trial (June 2018) also describes its fish collagen as type I collagen, taken from fish skin.