This post contains affiliate links- if you click on them, I may be receive a small compensation. However, I only promote and write about products that I have personally used and absolutely love 🙂
Collagen is the most abundant protein in the body and is a key constituent of all connective tissues. Collagen provides the infrastructure of the musculoskeletal system, essential for mobility. The intake of collagen ensures the cohesion, elasticity and regeneration of skin, hair, tendon, cartilage, bones and joints. Collagen is a protein made up of amino acids: glycine, proline, hydroxyproline, and arginine. The composition of collagen is considered unique given its high hydroxyproline content. If you lack the amino acids that combine to form collagen, your body's cells can't produce enough of it. Threonine is an essential amino acid for collagen production. There are many benefits of collagen, such as healthy skin promotion and balanced nutrition for athletic performance.
Collagen Peptides are a natural bioactive ingredient that improves epidermis moisture content and prevents skin aging. Several studies have demonstrated that Collagen Peptides are highly digestible.More than 90% of collagen peptides are digested and quickly absorbed after oral ingestion. In order to be active, Collagen Peptides must have an excellent bioavailability. This has been confirmed in animals and human after oral administration wherein 95% was absorbed within the first 12 hours.
Collagen Peptides supply amino acids that are needed to build new collagen. Collagen Peptides are high in specific amino acids such as Glycine and Proline that are especially needed for the production of new collagen. The Collagen Peptides stimulate certain cells (fibroblasts, osteoblasts) to build new collagen. Supplementation with 30 – 70 grams of collagen peptides per day showed a reduction of risk for injuries on muscle, tendons, and ligaments in athletes.  Collagen supplements are the perfect protein to consume before and after exercise, helping to maintain and restore the protein content of muscle. Collagen Peptides, which consists of 20% glycine and 8% arginine, may help the synthesis of creatine in the body. Creatine has been shown to help improve performance during short periods of exercise, thus helping athletes to increase their body mass and reduce body fat percentage.  Creatine is made of three amino-acids, glycine, arginine, and methionine. Each serving of Vital Proteins Collagen Peptides contains 4.12g of Glycine, 1.68g of Arginine, and 120mg of methionine.
 Cosgrove, M.C., Franco, O.H., Granger, S.P., Murray, P.G. and Mayes, A.E. 2007. Dietary nutrient intakes and skin-aging appearance among middle-aged American women. The American Journal of Clinical Nutrition, 86: 1225-1231.  Asghar, A and Henrickson, R.L. 1982. Chemical, biochemical, functional characteristics of collagen in food system. Advances in food research, 28 :231-372.  Iwai, K., Hasegawa, T., Taguchi, Y., Morimatsu, F., Sato, K., Nakamura, Y., Higashi, A., Kido, Y., Nakabo, Y. and Ohtsuki, K. 2005. Identification of food-derived collagen peptides in human blood after oral ingestion of gelatin hydrolysates. Journal of agricultural and food chemistry, 53: 6531-6536.  Wu, J., Fujioka, M., Sugimoto, K., Mu, G. and Ishimi, Y. 2004. Assessment of effectiveness of oral administration of collagen peptide on bone metabolism in growing and mature rats. Journal of bone and mineral metabolism, 22:47-553.  Oesser, S., Adam, M., Babel, W. and Seifert, J. 1999. Oral administration of 14C labeled gelatin hydrolysate leads to an accumulation of radioactivity in cartilage of mice (C57/BL). Journal of nutrition, 129:1891-1895. Referenced from http://jn.nutrition.org/