Collagen hydrolysate, collagen peptide and gelatin: what is the difference?

Beyond Biopharma | Collagen Peptide FAQ

Short answer: Collagen hydrolysate and collagen peptide generally describe the same ingredient: collagen that has been broken down by hydrolysis into short chains that dissolve in cold water and do not gel. Gelatin is the partly hydrolysed form that keeps long enough chains to set a thermoreversible gel, melting when heated and setting again on cooling. The three names therefore describe one raw material at different degrees of hydrolysis, not three different substances.

One raw material, three names

All three ingredients begin with collagen extracted from animal connective tissue, most often bovine hide and bone, porcine skin, or fish skin and scales. What separates them is how far the hydrolysis is taken. Enzymatic or thermal treatment breaks the triple helix and cuts the long protein chains into shorter fragments. Stop early and the material still behaves like gelatin. Continue the hydrolysis and the chains become short enough that the material is fully soluble in cold water and loses all gelling power, which is what the trade calls collagen hydrolysate or collagen peptide. Because hydrolysate and peptide describe the same end point, the two words are used interchangeably, and the choice of one over the other in a document is a matter of habit rather than of chemistry.

What hydrolysis changes

• Chain length - the average molecular weight falls from hundreds of thousands of daltons in native collagen to a few thousand daltons or less in a collagen peptide.
• Solubility - gelatin needs hot water and sets on cooling; a collagen peptide dissolves in cold water at useful concentrations.
• Gelling power - gelatin forms a thermoreversible gel; a collagen peptide forms no gel at all and adds almost no viscosity.
• Clarity - a well processed collagen peptide gives a clear solution, which is why it suits drinks and clear liquid formats.
• Taste and odour - further hydrolysis and purification generally reduce the characteristic gelatin note, though the sensory profile still depends on raw material and process.

Gelatin: the partly hydrolysed form

Gelatin sits between native collagen and a fully hydrolysed peptide. Its production is gentler: the collagen is pretreated with acid or alkali and then extracted with hot water, which breaks the structure enough to make the protein soluble but leaves a fraction of long chains and helical segments intact. Those remaining segments re-form a network on cooling, trapping water and producing the elastic, thermoreversible gel that defines gelatin. Gel strength is measured as Bloom value, and the melt and set behaviour means a gelatin gel melts at roughly 35 degrees C, close to body temperature, which is at the heart of its use in confectionery, desserts and pharmaceutical capsules. Gelatin is also described as partially hydrolysed collagen for exactly this reason.

Why the names get mixed up in labelling and trade

Regulatory and labelling language adds to the confusion. On a cosmetic ingredient list the ingredient appears as Hydrolyzed Collagen regardless of how short the chains are, and in some markets the same material is declared on a food or supplement label as hydrolysed collagen, collagen hydrolysate or collagen peptides. Ingredient suppliers may also use peptide language for marketing while their specification is written as hydrolysed collagen, and the reverse happens just as often. The practical rule is to ignore the name in the headline and read the specification: molecular weight distribution, solubility, gelling behaviour and protein content tell you which material you are being offered.

Choosing between them

Choose by function rather than by name. If the product needs to set, hold a shape or suspend particles, gelatin is the functional choice and its Bloom value is the specification that matters. If the product needs a protein that dissolves quickly and stays out of the way of texture, flavour and clarity, a collagen peptide is the usual answer. If a formula needs both - a gummy that sets and also carries a protein claim - the two are combined, with the gelatin doing the structuring and the peptide contributing the protein. In every case, the specification and the certificate of analysis for the actual lot are the documents that settle what the material will do.

Related reading

For more detail, see what a collagen peptide COA reports, using collagen peptides in gummies and confectionery and the applications collagen peptides are used in.