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L-Proline (not to be confused with Prolene) is a nonessential amino acid that is used in the production of collagen in the human body. L-Proline amino acid makes up about 15% of collagen in the body. Collagen is the most abundant protein in the human body. It makes up about 30% of our total protein and 70% of our connective tissue. Our bodies produce collagen but it decreases as we age. Collagen helps to maintain skin elasticity, bone strength, joint health and muscle mass. Taking L-Proline works to support the skin and fortify the joints as well as contribute to the heart and cardiovascular system.* In addition, proline supplements may also supports gut and the digestive system.* In addition to collagen production, L-Proline is a non-essential amino acid that helps to build protein. Proline is most commonly used for muscle soreness due to exercise.