Beef tendon, trotters, chicken wings, chicken skin, fish skin and cartilage are all rich in collagen. The secret of collagen beauty every time I eat out, someone will point to the trotters and politely say to the lady at the same table, "Girls can become beautiful if they eat more." Because many people know that pig's trotters contain a substance called collagen, and collagen is the hottest new term for beauty nowadays. From cosmetics for external use, to oral capsules, to filling materials for plastic surgery, it can be seen everywhere. What is collagen? What kind of beauty secrets does it have? 1 collagen loses, and collagen appears after aging. Collagen is a kind of polymer protein, which can keep skin firm and elastic. It exists in human skin, bones, teeth, tendons and other parts. On the skin side, it forms a reticular support with elastic fibers, providing solid and powerful support for the dermis. With the increase of age, the content of human collagen will gradually lose, and the skin will lose its elasticity, become thinner and aging. Therefore, it can be said that human skin aging is indeed inextricably linked with the loss of collagen. Indeed, some foods containing colloid, such as beef tendon, pig's trotters, chicken wings, chicken skin, fish skin and cartilage, are rich in collagen, but your skin can't get much benefit from diet. Oral and external use may not beautify the market. Collagen has various oral capsules and oral liquids. Experts believe that oral capsule (oral liquid) is collagen extracted from animal skin by hydrolysis, and it only becomes an amino acid "part" after oral administration. Due to individual differences and actual needs, the animal collagen or amino acids that everyone eats will never be dominated by the subjective wishes of users. Therefore, it is obviously exaggerated to use collagen for skin care, beauty and anti-aging. At the same time, the collagen in protein in daily diet is enough for the actual needs of human body. Healthy people and people with normal diet and nutrition do not need to supplement collagen specifically. Aging is a natural law, and no measure can reverse it. We should realize this. There are also many skin care products about collagen on the market. Adding certain collagen or amino acids to cosmetics can protect the skin and resist aging, but this effect is temporary and will not be converted into its own collagen after long-term use. Injection also has some limitations. The most effective way to "directly supplement" collagen is to inject collagen extracted from calf into dermis like an injection in cosmetic medicine to repair static wrinkles, such as wrinkles around lips and scars and pits formed by collagen with severe inflammation of acne (acne). However, there are some restrictions: 1. The effect is temporary. Collagen injected into the body will not stay in the dermis all the time, but will be slowly consumed and metabolized, so it can only last for about six months to a year, depending on the individual situation, and then it must be injected again. 2. It is expensive. The cost of several thousand yuan per injection is not affordable for every consumer. It may cause a few people to be allergic. Dermatologists advise people with allergies to do allergy tests first to make sure there are no adverse reactions, and then insert needles. At present, the relatively new method is to inject hyaluronic acid, another powerful moisturizing ingredient, instead of collagen, which can avoid allergic problems and is safer. 4 it is better to make up than to prevent. Because of the existing methods of supplementing collagen, the effect is not very good whether it is external rubbing or oral administration. Experts believe that starting from "prevention" is to slow down the loss and degradation of collagen more effectively. The first is sun protection. Dermatology believes that more than 90% of premature skin aging is caused by improper sunlight exposure. Secondly, a balanced diet, especially eating more fruits and vegetables containing antioxidants, such as carrots, tomatoes and grapes, and drinking more red wine and tea, can protect collagen in the skin. Finally, don't forget to avoid eating high-fat food. Foods with high calorie and fat, especially fried foods, are prone to produce free radicals and accelerate aging. If we can eat less of this kind of food, we will reduce the chance of being hurt by free radicals and reduce the risk of dark spots and wrinkles on the skin.

Collagen from pork hands, pigskin, beef tendon, chicken feet, fish and other foods is also called collagen, which is the most abundant and widely distributed protein in human body. Collagen exists in human skin, bones, teeth, tendons and other parts, which is very important for the formation of human skin, blood vessels, bones, teeth and cartilage. Collagen is the main substance of these connective tissues. 70% of the total weight of skin is collagen, almost all cartilage is collagen, and normal bones also contain 80% collagen (in bones, the role of collagen is mainly to use its reticular structure to adhere to calcium, phosphorus, minerals and other components to form bones). Collagen molecules contain a lot of glycine, proline and hydroxyproline, among which hydroxyproline cannot be synthesized by human body itself, and hydroxyproline is an essential substance for human cartilage and connective tissue, so it is very important to supplement collagen for human health. Collagen has five characteristics: 1. Nutrition: Collagen is an essential nutrition for the skin, which can enhance the protein activity of the skin. 2. Repairability: Collagen has a unique repair effect on the skin. 3. Moisture retention: Collagen is composed of triple helix structure, forming a vast space, rich in anionic side chains and a large number of hydrophilic groups. 4. Affinity: Collagen is easy to combine with skin without any rejection. After several weeks of collagen supplement, it gradually combines with collagen cells, fibroblasts, fat cells and capillaries in the body to produce its own collagen. 5. Elasticity: Collagen itself has good elasticity. Because collagen plays the role of scaffold and connection in skin tissue, it plays a very important role in skin elasticity and automatic recovery. Collagen has seven health functions: 1. Make skin smooth, elastic, moist and wrinkle-resistant. The growth, repair and nutrition of skin are inseparable from collagen, and the decrease of collagen content in dermis is an important reason for wrinkles. After people reach the age of 25, the metabolic rate will gradually slow down, the content of collagen will gradually decrease, and wrinkles will quietly surface. Moisturizing: Collagen is rich in hydrophilic natural moisturizing groups, which can combine with protein on the skin surface to replenish the lost collagen, and at the same time, it can conserve skin moisture and make the skin have good hydrophilicity. Anti-wrinkle: Because the molecular structure of collagen is very compatible with human skin collagen, it can be completely absorbed by the skin and filled between the skin matrix layers, thus making the skin plump and wrinkle-free, and at the same time increasing the skin density, generating tension and increasing skin elasticity. Repair: Collagen has a unique repair function, good affinity with surrounding tissues, and has the function of repairing tissues. Give skin elasticity: Collagen can make skin soft, plump and elastic, lubricate cuticle, stimulate skin microcirculation, promote skin metabolism, make skin smooth and shiny, and reduce wrinkles. 2. Breast enhancement. Breast is mainly composed of connective tissue and adipose tissue. The size of breast depends on the number of mammary tissue and adipose tissue, while a tall and plump breast depends largely on the support of connective tissue. Collagen interweaves the main components of connective tissue and polysaccharide protein into a network structure, which produces a certain mechanical strength, and is the material basis for supporting the curve of human body and reflecting the tall and straight posture. In addition, collagen can also increase skin elasticity and promote skin smoothness. 3. Strengthen bones. The growth and development of bones began in the embryonic stage, peaked at the age of 30, and then decreased at the rate of 0.5- 1% per year. Bone growth and bone loss are in dynamic balance. The older you get, the more you lose, and the greater the possibility of osteoporosis. If the bone lacks collagen, it is difficult to fix calcium, resulting in calcium loss and decreased bone density. In order to make bones strong, in addition to supplementing calcium and vitamin D, you must also take in enough collagen. 4. Joint health. Because collagen is the main component of cartilage tissue in joints, it is responsible for building the framework of cartilage tissue and shaping it. Therefore, supplementing proper amount of collagen can maintain the automatic generation mechanism of human cartilage tissue, protect joints from wear and destruction, and also prevent osteoarthritis caused by various reasons. Athletes and fitness enthusiasts often have to bear excessive load, which leads to knee pain and joint injury of many athletes. Most elderly people suffer from knee joint diseases. Collagen supplementation can improve joint pain and degenerative arthritis. 5. Hair is shiny. 6. Improve human immunity. 7. Ability to promote wound healing.