HCG is best suited for REDUCING the negative of ending a steriod cycle. Quoting Dr Mauro Di Pasguale in his book " Drug use and Deterction in Amateur Sporting": ...although HCG does stimulate endogeneous testosteron production, it does not help in re-establishing the normal hypothalamic/pirutary testicaular axis...
Meaning, that its only stimulates the testicle but does not re-start them. After prolonged roid usage, the hypothalamus & pituitary are in refractory state due to the the supression on the gonad cycle.
Nonetheless, some believe that it has a decent place at the end a cycle. The athlete; however, should consider taking CLOMID, NOLVADEX, CLEMBUTEROL, PROVIRON and EPHEDRINE along with HCG in a propert manner/program
Side effects are almost identical to TESTO, nonetheless with higher aromatiztion.. some people that dont have severe acne while using any test-o, develop HUGE pimples in facial area with HCG...
A very popular tecnique used by some to minimize the negative side effects and lost of QUALITY MUSCLE (not liquid muscle) at the end of a cycle is to taper of with PRIMOBOLAN DEPOT (last 4 weeks) and then take all the post cycle pharmaceauticals.
As for dose, it all depends.. there are many opinions on the matter. It depends on the athlete weight, type of cycle and physique. Asuming that a 200 lb, 12% body FAT, 5.8', athlete ended his cycle with a low androgenic\high anabolic steriod (PRimo Depot), 5000 i.U every five days for no longer than three (3) weeks. Some believe that continous use of HCG (for longer than four weeks, could permanently repress the body's own production of gonadotropind. Better safe than sorry.
For more information, is recomended to acquire any/most of the various anabolic references quides\reviews available.