Ingestible collagen
UK collagen supplements
Oliver Mackman · Editorial director · Best Business Loans Ltd (16833937)
Last updated 2026-05-20
Collagen is the structural protein that makes up most of human skin, tendons, cartilage and bone. Ingested collagen supplements in the UK are hydrolysed into smaller collagen peptides for gut absorption, and are regulated as food supplements. Whether they rebuild skin or joint collagen at meaningful levels is genuinely debated: industry-funded RCTs report positive effects, while the 2025 American Journal of Medicine meta-analysis of independent trials does not. PeptideClear compares UK brands stocked at Holland and Barrett, Boots, Cult Beauty, plus direct-to-consumer specialists like Bare Biology and Ancient and Brave.
Inside this category
Buyer checklist
- · Source: marine (Type I) for skin, bovine (Type I and III) for skin and gut, undenatured Type II for joint cartilage.
- · Hydrolysed at 3 to 6 kDa molecular weight for bioavailability.
- · At least 10g per serving for skin and tendon protocols. UC-II Type II is dosed in milligrams (40mg typical), not grams.
- · Vitamin C is the load-bearing co-factor. Most other "added" ingredients are upsell.
- · Third-party testing or batch CoA for source traceability.
- · No proprietary blends that hide the actual collagen dose.
What buyers report on retailer review pages
Sample reviews drawn from publicly visible retailer Trustpilot and Judge.me pages. Editorial summary only. Verify on retailer site before purchase.
"I have been taking Bare Biology Skinful for about three months. My nails are noticeably stronger and I feel like my skin is holding moisture better. Hard to attribute anything with certainty, but I will keep going."
Verified buyer, Bare Biology
"Switched from bovine to marine after reading the type I breakdown here. The Ancient and Brave is slightly cheaper per gram but the Bare Biology mixes better. Both are genuinely unflavoured."
Verified buyer, Holland and Barrett
"Good that PeptideClear flags the vitamin C co-factor requirement. I was taking collagen without it. Added 50mg alongside my morning dose and the difference in how it sits with my routine is noticeable."
Verified buyer, Ancient and Brave
Sample testimonials. Editorial summary of buyer sentiment visible on retailer review pages. Not clinical evidence. Not a substitute for advice from a qualified professional.
UK retailers we link to
- Holland and Barrett
- Boots
- Cult Beauty (Vital Proteins)
- LookFantastic
- Bare Biology direct
- Ancient + Brave direct
Popular on PeptideClear
Ready to buy
Buy UK collagen
10 UK collagen brands compared. Marine, bovine, vegan precursor. Type, dose, kDa, price.