For what purpose? Healing, or just to look buff?
Ha! Healing of course and maybe anti-aging. I am in my mid-thirties and an avid runner. I notice the knees and feet are beginning to hurt a lot more. As with the joints. Recovery is longer as well. I know it is probably normal for my age but I want to stave it off as long as possible.
The HGH products readily available in health food stores are a waste of money. If you are serious about reaching a healthy old age, find a doctor who understands HGH therapy. (You may wish to contact the American College for the Advancement of Medicine at 800-532-3688 for a referral.) You will have to take a shot of HGH, similar to an insulin injection, four days a week. Once you have stabilized, they can teach you how to give yourself the shot.
What I can tell you is to stop running! I used to run and now have both knees totally replaced.
No more running allowed I speed walk, bike, and do plenty of cardio and weights.
The running also ruined my back that will be my next operation.
I could go on and go on almost eternally speaking about the human growth hormone but I think this website is a good resume and good source of information that might prove to be helpful for you.
No doctor will give you HGH just to stay youthful unless they'll dealing on the black market. Taking HGH regularly is probably harmful, and I wouldn't do it. but it's your call. The natural products may or may not work, but they certainly won't jack it up as much as injecting the real stuff. I used to sell homeopathic HGH, don't know anyone who got a whole lot out of it. People did like the EAS HGH precursors, but it's very expensive and those were all body builders, who are nuts. They'll take anything. As for running, whether it bothers you or not depends on you and your shoes (or lack of them), your ethnicity, how limber you are, how fast you run, how far you run, how often you run. Nobody should do just one exercise. And as we age, there will be more injuries and more pain, it's there to tell us we're hurting ourselves. Masking it doesn't help. The best thing is to vary your exercise, eat well, rest well, stretch a lot, and if your knees are beginning to hurt, you're either running incorrectly, using shoes that don't suit you, or running just isn't the best thing, which of course it isn't unless you're running on bare feet on dirt or grass and not overeating protein which makes us rather large and puts more pressure on the knees. I'm with gym on this, running isn't the healthiest exercise, but I do it. But every exercise I've done hard has come to bite me now that I'm older -- weight lifting, kung fu, basketball, and running. Got pains from all of them. Of course, the worst is from the drunk driver that used the car I was in for a brake; that's the only thing that permanently damaged me.