To seriously look at increasing HGH release (instead of getting it through injections), there are some ways to do that naturally. "Sprint 8" is an exercise protocol (with some other lifestyle changes + nutritional guidelines around the time of the exercise) which needs to be done only 2 or 3 x per week.
You can read about it in a book by Phil Campbell, "Ready, Set, Go," (which is about other things than just Sprint 8--it's a total approach to exercise) but can easily find info on it on the web:
Peak Fitness Exercise Benefits | Phil Campbell Interview
Mercola has another post online which speaks to his results and benefits:
Peak 8 Exercises Increase Your "Fitness Hormone" Levels
The big thing about this protocol is much higher growth hormone release. As Mercola states, the benefits of growth hormone release (which naturally drop off as we age) are several, but all are anti-aging:
Decrease in body fat
Improved muscle tone
Firmer skin and reduces wrinkles
Increase in energy and sexual desire
Improved athletic speed and performance
Ability to achieve your fitness goals much faster
The protocol can be summarized as 20 minutes exercise divided as follows: 2 minutes easy, then 30 second "sprint," then 1:30 recovery, another 30 second sprint, etc. done 8 times, which gives you 20 minutes. The sprints (which can be done on lots of equipment or with running actual sprints--I find the recumbent bike easier on my back and easier to control the difficulty level, since as I get fitter I can just increase how hard it is to pedal) are supposed to build in intensity, with the last 3-4 being very intense--I think Campbell described it as, "after 15 seconds you should feel like you can't go on at that level, but then just hang on for the last 15 seconds."
Campbell's instructions about nutrition around the Sprint 8 workout itself are simple: a little carb beforehand + two grams of glutamine (a very cheap amino acid); then no sugars for two hours afterward, but at least 25 grams of protein--which I take in a protein shake.
I'd check it out and give it a try (depending on your level of fitness, it might take some time to build up to a Sprint 8 workout--I was out of shape, so spent a couple months building up fitness on my recumbent Exercycle and walking every morning before starting the sprints).
Haven't been doing the sprints that long, but it seems to have a positive effect. I've been changing other things lifestyle-wise as well and have dropped a bit over 20 pounds since mid-August, but have a long ways to go still to be where I'd like to be.