You are probably recalling this link:
Read the above.
The premise is not shutting down the testes and trying to restart them later.
When you take hCG, you are stimulating the testes. You can take hCG during a cycle to keep the testes from shutting down.
When you take a SERM, the hypothalamus and pituitary are in the game and LH and FSH are released which keeps the testes in the game.
So a cycle can be all low dose SERM then PCT consists of washing out T then slowly tapering the SERM, taking AI throughout and cruising on 0.5mg anastrozole per week.
Or take hCG during a cycle, then towards the end, switch to SERM to get the top of the HPTA active.
I am not advocating doing these things long term. We do have some TRT guys [younger] who to hCG monotherapy which is only good enough if testes are in good shape. And a few doing SERM only. A life time of SERM does not make sense. However, low dose hCG is a human hormone and its is safe.
hCG is hard to get and otherwise can be costly, SERMs are cheap and readily available.
hCG is not a Federal Schedule III drug. SERMs are not Schedule III drugs.
We know from TRT guys that Clomid can make some feel horrible, depressed and whacked libido. Nolvadex does not have those effects. Otherwise the two seem to do the same job and have similar dosing. If Clomid has worked for you, no problem.
Published side effects are for mostly older postmenopausal women, often taking higher doses than you will. The published side effects can be mostly ignored if you do not take high doses. And you will also not be taking chemotherapy drugs or doing radiation therapy that affect published side effects.
However some States have legislation making hCG a Schedule III drug.