http://news.bbc.co.uk/2/hi/health/8493042.stm
an extremely cheap way to increase testosterone levels is by taking vitamin D tablets
dont over consumer 10,000ui is the maximum a body should have at any time

thats my 5 cents

i advise to takw ZMA tablets. Zinc Magnesium Aspartate. Its a nightime mineral supplement that increases testosterone by 30 percent. You take it right before bed. Only cons aboutt taking it is you get acne. But thats a sign of increased test. levels

testosterone isn't going to help you get taller...

http://www.ftmguide.org/myths.html#3
it will if you are still in the stages of growth but not if you've finished puberty. so get your facts right

"How does puberty start? Puberty starts in your brain. Your brain sends a message to your testicles (balls) that it is time for your body to change. Your testicles make a special chemical or hormone called testosterone. Testosterone makes you grow taller and change shape and causes your testicles to make sperm. Sperm comes out of your body in a sticky, white liquid called semen (C-men). During sex, sperm shoots out of the penis. It can join with a woman's egg to make a baby form."
-http://www.drugs.com/cg/puberty-in-boys.html

so yes testosterone will help you grow taller if you are stil going through puberty