In 6 weeks she reportedly lost 25 lbs. of fat and gained 5 lbs. of muscle. She also felt she had a quicker recovery.
A number of amino acids have been shown to induce HGH release.
Actually, the standard test to provoke the pituitary to release growth hormone is an intravenous injection of 15 grams to 30 grams of arginine.
Sandy Shaw outlined a self experiment to speed healing of her broken foot in the book, Life Extension: A Practical Scientific Approach.
Shaw naturally stimulated the release of HGH by taking 10 grams of arginine each day on an empty stomach. About 45 minutes to an hour after taking the arginine, she performed 3 minutes of bench presses.
After rotator cuff repair you could consume this same level of arginine (10 grams) and perform a different set of exercises to induce the growth hormone release and quicker surgery recovery. Perform leg exercises such as leg presses or even deep knee bends.
About 1 hour after taking 10 grams of arginine, perform 3 to 5 minutes of leg exercise. If you did keep knee bends, try holding onto something for balance then lower yourself for a count of 5 and then raising back up for a count of 5. Do 10 of these as a set. That set will take about 1 minute 45 seconds. Rest 2 minutes and repeat.
Repeat this exercise or a different leg exercise in 2 to 3 days. This is actually a version of exercising that bodybuilders use to gain muscle mass - See The New High Intensity Workout for in depth exercise review.