Collagen is rich in 18 kinds of amino acids other than tryptophan, cysteine ​​and tyrosine, including 7 kinds of amino acids necessary for human body; collagen also contains two unique amino acids - proline and hydroxyproline , also contains pyroglutamic acid which is rare in general protein and hydroxylysine which hardly exists in other proteins, and the content of alanine and glutamic acid is relatively large, and the nutrition of collagen is very rich

The amino acids of collagen peptides are not only rich in amino acids, high in protein content, and fat-free, which meet people's needs for "low-fat, high-protein" food, collagen peptides can also be directly absorbed in the intestinal tract. With the continuous improvement of people's requirements for food nutrition, foods rich in collagen will be more and more popular, and collagen will also become a good source of nutrition.

Taking collagen peptides orally can make the body more directly and effectively absorb the active ingredients, and quickly supplement the nutrients needed by human tissues; it can help the human body take in sufficient amounts of hydroxyproline and hydroxylysine, and promote the synthesis of collagen in the body , so as to effectively avoid diseases caused by collagen deficiency.

The molecular size of collagen peptides is nano-scale, and the absorption and utilization rate after oral administration is high. It is easy to absorb in the stomach, blood vessels and skin, and reduces the burden of digestion in the gastrointestinal tract. In addition, collagen peptides can accumulate in cartilage after being absorbed and circulated in the human body, which can have a good relief effect on joint diseases

As a new functional food ingredient with high biological safety, marine collagen peptide has the characteristics of easy absorption, and its digestion and absorption rate is almost 100%, which is better than that of unhydrolyzed macromolecular collagen or free amino acids.

In addition, marine collagen peptides also have the characteristics of low antigenicity, hypoallergenicity, high solubility, and high thermal stability. They can be eaten directly as functional foods alone, or compounded with other raw materials to form compound products, such as cereals Protein bars, yogurt and jellies, and more. At present, the forms of marine collagen peptide products on the market show a trend of diversification, and the dosage forms mainly include oral liquid, chewable tablets, powder, granules, soft capsules, etc.

Collagen is the main component of the dermis of human skin, together with a small amount of elastin, it forms a regular collagen fiber network structure, which makes the skin have a certain elasticity and hardness, and transports moisture to the epidermis.

Hydrolyzed collagen can provide high-quality amino acid raw materials for the synthesis of human collagen, especially proline and hydroxyproline, which can promote the synthesis of collagen, timely replenish the lost collagen of human skin, and help maintain collagen in the skin The special network structure, so as to achieve the effect of improving skin moisture and delaying skin aging.

At present, the cosmetic health food developed with collagen as the main raw material conforms to the modern people's concept of pursuing beauty "from the inside out" _[4] .

Collagen peptides can be widely used in liquid dairy products such as neutral milk beverages, acid milk beverages, fresh milk, yogurt, etc., to play the role of anti-whey precipitation and emulsification stability. It can also be added to milk powder, which can not only improve the nutritional value of milk powder, but also enhance the health function of milk powder, strengthen bone development, and improve the body's immunity _[4] .

Collagen peptides can be added to bread, which can prolong the aging time of bread and increase the volume and softness of bread. It can also be added to candy to develop low-calorie candy 

All in all, as a natural protein, collagen peptides not only have various types, are easy to process and modify, are safe and environmentally friendly, but also have good biocompatibility and biodegradability, and have broad application prospects and development space in the food industry. It is believed that with the continuous improvement of people's requirements for quality of life and the deepening of awareness of collagen peptides, the demand for collagen peptides will increase, and the market potential of collagen peptides is huge.