HCG is DRAMATIC in bringing back natural test production.
However BE SURE to cycle it, so your body wont shut down natural HCG production.
Clomid is very effective too, and perhaps cheaper/safer.
You need bac water to be able to store it, otherwise you have to use it all right away if you use the solution it comes with. Get some bac water bro, and yes store it in the fridge. HCG + nolva works awesome!
HCG will inhibit your natural test! the point of HCG is to use it for the duration of a cycle to keep your nuts in producing order. Then once the last of the cycle has cleared your system, you stop HCG and start clomid to bring up the natural test.
in essense:
-HCG throughout the cycle keeps the nuts ready to produce
-Drop HCG and add clomid to make them start producing