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.
It takes about 1 week to heal a pulled muscle. You need to make sure that you put ice and heat on it every three to four hours. You can not do anything to your back or it will â¦ turn worse. deep contusion or bruise on the muscle may take â¦ as much as a month to 6 weeks, if it's large and deep enough -- large muscle invovled. If the bone is bruised -- longer. The femur can take a lot of damage without breaking, but that damage would still have to heal.