i am 15 and need to gain a bit of height i am 5'5 and want to grow about to 5'11 i have done alot of research on hgh and how to stimulate it it is pretty simple amino acids are a great way i will be taking 500mg l-lysine,1g l-arginine and 500mg orthinine straight before a high intensity sprint for 20 mins and then a multivitamin supplement and then straight to bed if you are still uder 21 and want to grow taller i suggest this to you i will use the best products on the market these are the products i will use arginine/orthinine supplement http://www.biovea.net/product_detail.asp?PID=96 lysine supplement http://www.active-health.co.uk/acatalog/L_Lysine_capsules.html multivitamin supplement http://www.bio-synergy.co.uk/store/product.php?productid=16160&cat=&page=1 these are very high quality stuff i know i am still 15 but i will only use it for 2- 3 months so i should not be really bad any suggestions or comments