The basic ingredients for testosterone are zinc, vitamin D, cholesterol, with selenium and magnesium being present as well. Research suggests that an amino acid called N acetyl cystein can be beneficial to increasing glutathione in the testes which makes for healthier teste function and increased testosterone. Sleep is critical. Excess alchohol or body fat do not compliment testosterone production Exercise in proper amounts has been shown over and over to raise T. Moderate amounts of porn and or masturbation are probably fine, but porn induced erectile dysfunction is real. Erectile dysfunction is not fun, it's crushing. Erectile dysfunction can be caused by many things aside from low T. Man up and see your doctor if all else fails. Garlic and vitamin C together have been helpful for me, for what it's worth.
Unfortunately, that situation is still rare, so you need to be ready to bring your own info to the table. Even under the care of an endocrinologist or urologist, specialists who are up-to-date with the most efficient treatment methods, you are your own best advocate, and the more knowledgeable you are, the better. Cluelessly smiling and nodding (as your doctor describes why your current treatment doesn't warrant the inclusion of HCG, even though know you're having issues HCG could directly address) means you end up receiving inadequate care... and it's your own fault.
Health problems. Lots of things that can go wrong here but I wont bother to go into too much detail because you have heard it all before. These problems are very dosage dependent and drug dependent. Enlargement of the heart is probably the biggest problem. Although enlarging your heart sounds like a good thing, its very, very bad and is what leads to heart attacks in young bodybuilders. Damaging your kidneys and liver is another relatively common problem as the body works overtime to filter out stuff that it doesnt want. Then there is the problem with natural testosterone production being shut down.