Muscle Strain

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Healing Muscles and Joints
http://www.alive.com/articles/view/17182/healing_muscles_and_joints

Healthy Muscles Matter
http://www.niams.nih.gov/Health_Info/Kids/healthy_muscles.asp

Sprains and Strains
http://www.truestarhealth.com/Notes/1276004.html
Adequate amounts of calories and protein are required for the body to repair damaged connective tissue.
(other info about vitamins for repair)

Supplements to Repair Torn Muscle
http://www.livestrong.com/article/427953-supplements-to-repair-torn-muscle/
There are numerous nutritional supplements that may be appropriate in repairing your torn muscles. According to the University of Maryland Medical Center, both herbal and non-herbal nutritional supplements have historically been used in treating muscle tears, including glucosamine and chondroitin sulfate, bromelain, vitamin C, zinc, white willow bark, turmeric, and horse chestnut.
Vitamin C, also known as ascorbic acid, may be one of the most helpful supplements in treating your torn muscle.

Sprains and strains
https://umm.edu/health/medical/altmed/condition/sprains-and-strains
Vitamin C (250 - 500 mg two times a day) and beta-carotene (50,000 IU per day for 5 days)
Bromelain (250 mg twice a day) -- This enzyme that comes from pineapple reduces inflammation and helps reduce swelling.
Zinc (15 - 30 mg per day)
Glucosamine and chondroitin
glucosamine, 1,500 per day; chondroitin, 800 - 1,200 mg per day, divided in two to four doses. They are often combined in one supplement.