What is Collagen Peptide?

Difference between Collagen Peptide and Gelatin

A chart comparing collagen, saltine, and collagen peptide.

“Collagen” is a general term that encompasses collagen, gelatin, and collagen peptide, distinguished by differences in molecular weight and physical properties. Collagen peptide is a low-molecular-weight, soluble protein obtained by enzymatically hydrolyzing gelatin. Unlike gelatin, a collagen peptide solution does not harden, even when dissolved in water and cooled.

Amino Acid Composition

The structural characteristics of collagen include a repeating Glycine (Gly) –X-Y sequence (where X and Y can be any amino acid) and a high content of Proline (Pro) and Hydroxyproline (Hyp). About one-third of the amino acids in collagen are glycine, with proline and hydroxyproline each making up about 10%. Hydroxyproline is an amino acid found exclusively in collagen.

Collagen Peptide Production Flow

After the pretreatment of raw materials, the hot water extract of collagen is hydrolyzed through an enzymatic process to adjust to the desired molecular weight. Subsequently, collagen peptide is purified and processed into powder form through filtering, an ion exchange process, sterilization, and drying.


Collagen peptide is primarily composed of protein (collagen) and contains minimal ash and lipid.

Energy347 kcal
Water11.3 g
Protein87.6 g
Lipid0.3 g
Carbohydrates0 g
Ash0.8 g
Sodium260 mg
Dietary fiber0 g
Per 100g of edible portion.

The data above refers to the Standard Tables of Food Composition in Japan 2020 (8th edition, gelatin).

The Types of Collagen

There are various types of collagen, depending on the animal species and organs, with 28 types currently identified. The type of collagen found in nippi peptide® is type 1, which is the most abundant in the body, predominantly found in the skin, bones, tendons, fish scales, and most connective tissues.