Which parameters can be customised: molecular weight, source or grade?

Beyond Biopharma | Collagen Peptide FAQ

Short answer: Collagen peptide can be tailored on several axes: the molecular weight range set by the degree of hydrolysis, the raw material source and any blend of sources, the level of deodorisation and decolourisation, the particle size and whether the powder is agglomerated, and the packaging format. Each choice trades off against solubility, taste, clarity and cost, so customisation is usually a matter of balance rather than a single ideal setting.

Molecular weight range and degree of hydrolysis

The most common point of customisation is the molecular weight profile. Collagen is hydrolysed with enzymes and heat, and how far the reaction is taken determines the size of the resulting peptides. A lighter hydrolysis leaves a broader distribution with a higher average molecular weight; a deeper hydrolysis shifts it toward short peptides and free amino acids. The profile drives several practical properties at once: shorter peptides generally dissolve faster and give clearer solutions, while some reported bioactivity is linked to short sequences such as proline-hydroxyproline dipeptides and tripeptides. Molecular weight is normally specified as a distribution - for example a percentage below a given cut-off - and measured by size exclusion chromatography. Because the same average can hide different distributions, look at the full curve and the stated method, not only an average figure.

Raw material source and blends

• Bovine - hide or bone, the most widely used source, with a neutral taste profile and good cost efficiency.
• Marine or fish - skin and scales from species such as cod, tilapia or salmon, often chosen for lighter colour and a marine sourcing story.
• Porcine - available in some markets but excluded from halal and kosher certification.
• Blends - mixtures of bovine and marine material, or blends with other proteins, used to balance cost, taste and positioning.
• Type selection - Type I and Type III rich material from skin and bone, or Type II material from cartilage.

Source choice is also a labelling decision, because the species must be declared in most markets and fish material carries allergen labelling obligations. Blending two sources can look attractive commercially, but it makes traceability and allergen control more demanding, so the blend has to be defined precisely and tested consistently.

Taste, odour and colour

Collagen hydrolysates carry a characteristic protein note, and marine material is often perceived as having a stronger fishy note than bovine material. Processing options include charcoal treatment, filtration, ion exchange and controlled drying, which reduce colour and volatile odour compounds, and how far these steps are applied is a genuine customisation axis. More aggressive treatment adds cost and can shift the peptide distribution, so a heavily deodorised grade is not automatically better. For a flavoured beverage or a gummy, taste and colour matter a great deal; for an opaque capsule or tablet they matter much less.

Particle size, agglomeration and packaging

Powders can be milled to different particle size distributions and agglomerated into coarser, more porous granules. These choices change how the powder behaves on a production line rather than what it does in the body: fine powder dissolves quickly but generates dust and can bridge in hoppers, while agglomerated granules flow more freely and produce fewer lumps in water. For packaging, the usual formats are food-grade liners inside fibre drums, foil-laminate bags and larger bulk containers, sometimes packed under nitrogen to limit oxidation and moisture pickup. The right choice follows from the powder's hygroscopicity and the storage conditions at the destination, since moisture uptake is the main route to caking.

What customisation cannot change

Every parameter above is negotiated inside the limits of the process and the raw material, and some things cannot be engineered away. No collagen peptide is a complete protein, because it is low in tryptophan and lacks the full essential amino acid pattern. No collagen peptide can be made vegan, because the starting material is animal tissue. And no adjustment of molecular weight turns a food protein into a medicine, so claim wording still has to fit the rules of the target market. It is worth agreeing in writing which properties are fixed, which are adjustable, and which test methods will confirm them, because that specification becomes the reference for later batch releases.

Related reading

For more detail, see how batch-to-batch consistency is controlled, non-GMO status and allergen control and vegan collagen alternatives.