# Hydrolysate or tripeptide? Why molecular size decides with collagen

> It is not the amount of collagen in the powder that matters but the chain length. What peptide research shows about Pro-Hyp and tripeptides - and what EFSA permits.

Collagen is the most abundant protein in the human body - and the least understood item on the supplement shelf. The decisive question is not how much collagen sits in the tub, but at which molecular size. That is exactly where marketing parts ways with biochemistry.

## Hydrolysate and tripeptides: two molecular sizes, two jobs

Native collagen is a giant molecule and practically impassable for the gut. That is why it is enzymatically cleaved. **Collagen hydrolysate** consists of peptide chains with a molecular weight of typically 2,000 to 5,000 daltons. **Collagen tripeptides** are shorter: three amino acids, usually in the Gly-Pro-Hyp pattern. Shorter chains mean less digestive work and faster absorption via peptide transporters such as PepT1.

## How collagen peptides arrive in the blood

Iwai and colleagues demonstrated in 2005 that after drinking gelatin hydrolysate, measurable amounts of hydroxyproline-containing peptides circulate in human blood - above all **Pro-Hyp** and **Hyp-Gly**. These di- and tripeptides are the mechanism research actually debates: they survive digestion intact and, in cell experiments, can influence the activity of fibroblasts, the cells that build new collagen. Yazaki and colleagues showed in 2017 that ingesting collagen tripeptides raises blood levels of these peptides more than hydrolysate alone.

## What EFSA says - and what it does not

This needs plain words: EFSA has authorised no health claim for collagen as such. Collagen may therefore not be advertised with health-related promises. What remains is the factual description: collagen is a natural structural protein and a component of skin, bone, cartilage and connective tissue. Everything beyond that is study evidence - interesting, partly positive, but not recognised as a claim. Anyone telling you otherwise is selling you a story.

## Why "no flavouring" is a functional feature

Flavour-free collagen is not a stripped-down version but a decision with consequences. Without flavouring, sugar or sweeteners the powder stirs into anything: coffee, porridge, soup, smoothie. The ingredient list stays at two entries - for people who avoid sweeteners, the more pragmatic route.

## How WOO® Kollagen Nature is built

**[WOO® Kollagen Nature](/en/shop/woo-collagen-nature-can)** in the tub contains exactly two ingredients: collagen hydrolysate (87%) and collagen tripeptides (13%), both bovine and produced in Switzerland. No sugar, no sweeteners, no flavouring. One 15 g serving delivers 14 g of protein at 54 kcal, zero carbohydrates and zero fat - the tub holds 30 servings.

Use: stir one scoop (15 g) into 200 ml of water and drink. The daily amount of one serving should not be exceeded. The scoop is the advantage of the tub format: you can ramp up gradually if you prefer. Vitamin C is a cofactor of the body's own collagen synthesis - which is why many users combine **WOO® Kollagen Nature** with a vitamin C source. Note: the product contains bovine collagen and is not suitable for vegans or vegetarians.

## Frequently asked questions

**Is collagen tripeptide better than hydrolysate?**
It is shorter and absorbed faster; studies show higher peptide levels in blood. Whether that becomes a clinically relevant difference is open. Combining both fractions covers both kinetics.

**Why 15 g per day?**
Studies work with 2.5 to 15 g daily depending on the endpoint. 15 g sits at the upper end of the investigated range and matches the manufacturer's intended daily serving.

**Can I put collagen in hot coffee?**
Yes. Hydrolysed peptides are heat-stable; coffee temperature no longer changes their chain length in any relevant way.

## Sources

Iwai K et al. (2005), Journal of Agricultural and Food Chemistry - Food-derived collagen peptides in human blood after gelatin hydrolysate ingestion.
Yazaki M et al. (2017), Journal of Agricultural and Food Chemistry - Collagen tripeptide intake increases collagen-derived peptides in blood.
Shigemura Y et al. (2009), Journal of Agricultural and Food Chemistry - Effect of prolyl-hydroxyproline on growth of fibroblasts from mouse skin.
EFSA NDA Panel (2010), EFSA Journal - Scientific opinion on health claims related to collagen hydrolysate.

*WOO® Kollagen Nature - pure collagen produced in Switzerland.*