Marine collagen peptides vs hydrolyzed collagen — what's the difference?

Reviewed by

Scarlett Gray APD

Accredited Practising Dietitian (APD200526) · BNutrDiet Hons · Sports Dietitian

Instagram LinkedIn Redefining Nutrition

Reviewed 21 August 2026

You'll see collagen supplements labeled variously as "collagen peptides," "hydrolyzed collagen," "marine collagen peptides," or "hydrolyzed marine collagen" — and it's fair to wonder if these are meaningfully different products or just marketing language. This article walks through what the terms actually mean, how the process behind them works, and what to look for when choosing a supplement.

Getting the terminology straight

Think of it this way:

• Native collagen — the intact structural protein found in connective tissues and raw animal sources. Because of its large, complex triple-helical structure, it is digested into smaller peptides and amino acids rather than being absorbed intact
• Hydrolyzed collagen — collagen that has already been partially broken down into smaller peptides, making it more readily digestible and absorbable
• Collagen peptides — short chains of amino acids produced by the enzymatic hydrolysis of collagen, resulting in smaller peptides that are more readily digested and absorbed
• Marine collagen peptides — collagen peptides specifically sourced from fish skin
• Bovine or porcine collagen peptides — collagen peptides from cattle or pigs, typically from hides and bones

What is collagen, exactly?

Collagen is a fundamental structural protein found throughout the body — the most abundant protein in the human body, in fact. It provides structure, strength, and resilience to:

• Skin
• Bones
• Tendons
• Ligaments
• Cartilage
• Muscle connective tissue
• Blood vessel walls

There are at least 28 known types of collagen in the human body, but a few are much more abundant than others:

• Type I — the most abundant type. Found in skin, bones, tendons and ligaments. Type I is the dominant collagen type in human skin
• Type II — the primary collagen in cartilage. Most relevant when the conversation is about joint health and connective tissue
• Type III — works alongside Type I in skin, blood vessels and internal organs. Associated with softer, more flexible tissue structures

Marine collagen is predominantly Type I — the type most relevant for skin, bone, tendon and ligament outcomes.

From around age 25, natural collagen production begins to decline at roughly 1-1.5% per year. Over time this contributes to the visible and functional changes we associate with aging — fine lines and less skin firmness, stiffer joints, changes in hair and nails, and eventually reduced bone density. Read more in our guide on why collagen becomes essential after 25.

Why hydrolysis matters

Enzymatic hydrolysis breaks collagen into smaller peptides that are more readily absorbed. This allows the peptides to cross the intestinal wall and enter the bloodstream, where they can reach target tissues and support collagen synthesis in skin, cartilage and connective tissue.

In practical terms: intact collagen (like the kind in bone broth or in raw animal sources) isn't as efficiently absorbed as hydrolyzed collagen. Quality collagen supplements use controlled enzymatic hydrolysis to produce consistent, well-absorbed peptides.

What the evidence supports

Skin — strongest evidence area

Clinical research on hydrolyzed collagen peptides consistently shows improvements in skin elasticity, hydration, and the appearance of fine lines with daily supplementation of around 10g over 8-12 weeks. A 2024 review published in the Journal of Cosmetic Dermatology and a systematic review and meta-analysis in the Indian Journal of Dermatology, Venereology and Leprology both support these outcomes.

Both marine and bovine collagen is hydrolyzed — broken down into smaller peptides so the body can absorb it through the digestive tract. Marine collagen has more evidence for skin outcomes specifically, which is why many skin-focused supplements use marine sources.

Joints — emerging evidence

Emerging evidence supports collagen for joint comfort and function over 12+ weeks, particularly when paired with movement or an exercise program. A 2021 systematic review by Khatri and colleagues in Amino Acids collated evidence on collagen peptide supplementation and joint outcomes, finding potential benefits particularly when combined with rehabilitative exercise. Studies use doses in the 5-15g range per day. What's supported: potential improvements in joint comfort and function. What's less established: strong claims about "protecting cartilage from degradation" or "reducing inflammation" — these framings go beyond what the evidence reliably shows.

Bone density — emerging evidence

Emerging evidence, particularly in postmenopausal women, alongside adequate vitamin D and calcium. Bone is roughly 30% organic matrix + 70% inorganic mineral, and collagen makes up about 90% of the organic matrix. During and after menopause, bone density loss is primarily driven by falling estrogen leading to increased bone resorption — not solely by collagen decline. Collagen supplementation fits as one supportive habit alongside the fundamentals (vitamin D, calcium, weight-bearing exercise, and medical care as needed). Read more in our guide on collagen and menopause.

Hair and nail condition — emerging evidence

Emerging evidence for both. Nail changes are often one of the earlier things people notice with consistent supplementation.

Connective tissue recovery — developing area

What to look for in a quality collagen supplement

Whichever term is on the label, these are the quality signals that actually matter:

• Hydrolyzed peptides — the label should specifically say "hydrolyzed collagen" or "collagen peptides." Intact collagen isn't as well absorbed
• Transparent sourcing — you should be able to see exactly where the collagen comes from (specific fisheries, farming practices, or animal sources)
• Independent third-party testing — certifications like Informed Choice, NSF Certified for Sport, or USP Verified. Especially important for marine collagen because heavy metals can accumulate in fish
• Research-supported dose — around 10g per day is the clinical standard for skin outcomes. Many capsule supplements contain 500-2,500mg per serving, well below research doses
• Minimal unnecessary additives — added sugars, artificial colors, and long lists of "proprietary blends" without individual dose disclosure are red flags
• Beneficial supporting nutrients — vitamin C is used by the body in collagen synthesis, so its inclusion makes biological sense

A word on Kollo

Kollo Premium Liquid Marine Collagen delivers 10,000mg of Naticol® marine collagen peptides per daily sachet — hydrolyzed for absorption, sourced from fish skin as byproducts of the fishing industry (Friend of the Sea and Marine Stewardship Council dual-certified), and delivered in a pre-measured liquid format. Alongside vitamin C (used by the body in collagen synthesis), a B vitamin complex (B1, B5, B6, B12) that supports normal energy metabolism, and l-lysine (an essential amino acid). Every batch is Informed Choice certified — independently tested for over 250 prohibited and potentially harmful substances. Not suitable for anyone with a fish allergy.

Frequently Asked Questions

Kollo Health was co-founded by Jenni Falconer — TV presenter, Smooth Radio breakfast host, ten-time London Marathon runner and host of the RunPod podcast. Read her story and why she created Kollo.