What Is Hydrolysed Collagen?

Hydrolysed collagen — also called collagen peptides or collagen hydrolysate — is collagen that has been broken down into smaller fragments through a process called hydrolysis. The result is short chains of amino acids with a molecular weight of around 2,000–5,000 Daltons, compared to intact collagen's molecular weight of up to 300,000 Daltons.

In practical terms: whole collagen is a very large, complex protein that your gut struggles to absorb efficiently. Hydrolysed collagen has been pre-digested into smaller, more soluble fragments that pass through the intestinal wall and enter the bloodstream as intact peptides — not just free amino acids.

A 2019 study using isotope-labelled collagen tracked specific dipeptides (particularly hydroxyproline-proline) through the body after consumption. They appeared in the bloodstream within 30 minutes and were detected in skin tissue up to 14 days later — confirming that collagen peptides are absorbed and delivered to target tissues intact.

Hydrolysis is a chemical reaction that uses water molecules to break chemical bonds. In collagen production, this is achieved enzymatically — specific proteolytic enzymes cleave the triple-helix structure of collagen into consistently sized peptide fragments.

Quality matters significantly here. The degree of hydrolysis (measured by average molecular weight of the resulting peptides) affects both solubility and bioavailability. Too large and absorption is poor; too small and the biologically active peptide sequences that stimulate tissue synthesis may not survive intact.

Premium hydrolysed collagen uses carefully controlled enzymatic hydrolysis that yields peptides in the 2,000–5,000 Da range — small enough for efficient absorption, large enough to preserve the hydroxyproline-containing sequences that research identifies as biologically active.

These three terms are often confused, but they refer to structurally distinct products with different bioavailability and applications.

Native (whole) collagen is the intact protein as found in animal tissue. It is insoluble in water, has very low oral bioavailability, and is largely broken down before absorption into generic amino acids. Gelatin is partially processed collagen — denatured by heat and acid, which breaks the triple helix but does not fully cleave the chains. Gelatin dissolves in hot water, gels when cooled, and has moderate bioavailability. Hydrolysed collagen is fully enzymatically broken down into short, soluble peptides — the most bioavailable form, which dissolves in both hot and cold water without gelling.

Since virtually all human clinical trials use hydrolysed collagen, the evidence base for collagen supplementation is specifically evidence for collagen peptides. A 2014 RCT in Skin Pharmacology and Physiology (women aged 35–55, 8 weeks, 2.5–5g daily) found statistically significant improvements in skin elasticity versus placebo, with effects persisting four weeks after stopping.

For joints: a 24-week study of 147 athletes found significant reductions in joint pain during activity with 10g of collagen hydrolysate daily. Researchers noted that collagen peptides appeared to accumulate in cartilage and stimulate chondrocytes to produce additional collagen locally.

A 2021 systematic review in the Journal of Drugs in Dermatology pooled 19 randomised controlled trials and concluded that collagen peptide supplementation consistently improved skin elasticity, hydration, and wrinkle appearance — rating the overall evidence as "promising" with a favourable safety profile.

Effective doses in research range from 2.5g to 15g daily. Skin studies typically use 2.5–5g. Joint and bone studies use 8–10g. There is no evidence of significant added benefit beyond ~15g daily for most outcomes.

Collagen Greens provides 4g of hydrolysed bovine collagen per serving — a dose that sits squarely within the range demonstrated effective for skin outcomes, and contributes meaningfully toward the higher doses studied for joint health.

Vitamin C is a critical cofactor: without adequate vitamin C, your body cannot properly hydroxylate the proline and lysine residues needed to form stable collagen triple helices. This is why combining collagen peptides with a nutrient-rich greens powder — which contributes to your overall micronutrient intake — is a logical combination.

Not all hydrolysed collagen supplements are equal. Source transparency matters: know whether you are getting bovine, marine, or poultry collagen, and which collagen types are present. Type I and III bovine collagen is the most extensively studied for skin and connective tissue outcomes.

Molecular weight is a quality indicator. Premium products specify their average peptide molecular weight (typically 2,000–5,000 Da). Products that omit this may contain partially hydrolysed collagen with variable and potentially lower bioavailability.

Finally, consider what the collagen is combined with. A supplement pairing collagen peptides with antioxidants, greens, and synergistic ingredients offers greater overall nutritional value than collagen in isolation.