1 Collagen is most commonly found within the body in the skin, bones and connective tissues. 2  The word collagen is derived from the Greek kolla, meaning glue. 3  Collagen gives the skin its strength and structure, and also plays a role in the replacement of dead skin cells. Collagen is most commonly found within the body in the skin, bones and connective tissues. 2  The word collagen is derived from the Greek kolla, meaning glue. 3  Collagen gives the skin its strength and structure, and also plays a role in the replacement of dead skin cells.
Healing time depends on the severity of the strain. Mild muscle strains usually heal within two weeks. Moderate muscle strains may take six to eight weeks to heal. Prevention of Recurring Back Strain. Many people who experience recurring back pain have weak core muscles - the muscles that support the back.
Grade 1 Strain: This is a mild strain. Only part of the muscle fibers have been damaged. Healing occurs in roughly two weeks. Grade 2 Strain: This is a moderate strain. There is more with more damage to muscle fibers than grade 1, but the muscle is not completely ruptured. Healing occurs within three to six weeks.Grade 3 Strain: This is a complete rupture of the muscle, which is far more serious of an injury than a grade 1 or 2. The healing period can take up to three months.rade 2 Strain: This is a moderate strain. There is more with more damage to muscle fibers than grade 1, but the muscle is not completely ruptured. Healing occurs within three to six weeks. Grade 3 Strain: This is a complete rupture of the muscle, which is far more serious of an injury than a grade 1 or 2.