In the bodybuilding space, hCG is increasingly used in combination with various AAS cycles.
When exogenous AAS enters a man's body, the natural negative feedback loop causes the body to shut down its own testosterone production by turning off the hypothalamic-pituitary-gonadal axis (HPGA). This can lead to testicular atrophy, etc. hCG is commonly used to maintain and restore testicular size and normal testosterone production during and after a steroid cycle.
High levels of AAS that mimic the body's natural testosterone trigger the hypothalamus to shut down its production of gonadotropin-releasing hormone (GnRH) from the hypothalamus. Without GnRH, the pituitary gland stops releasing luteinizing hormone (LH).LH usually travels from the pituitary through the bloodstream to the testes, where it triggers the production and release of testosterone. Without LH, the testes stop producing testosterone.
In male bodybuilder, hCG helps restore and maintain testosterone production in the testes by mimicking LH and triggering testosterone production and release.

How to prepare and inject your hcg dosage is described in detail below
1. Prepare hCG power, 5000IU as an example, bacteriostatic water, sterilized alcohol, 25 gauge syringe (or 27 gauge syringe)
2. Open the cap of the hCG and antibacterial water to reveal the rubber cork, through which the needle of the syringe is inserted into the bottle.
3. Use alcohol to disinfect the rubber stoppers of hCG powder bottles and antibacterial water bottles
4. Open the cap of the syringe needle and disinfect it with alcohol.
5. Insert the sterilized syringe needle from the rubber stopper into the bacteriolytic water bottle, and draw 2ml bacteriolytic water twice.
A helpful trick is to inject as much air into the bacteriab as you want to pump out, in this case preventing a vacuum in the bacteriab and helping to pump out the solvent faster.
6. Pour the extracted 2ml bacterial-inhibiting water into the hcg power bottle.
We now have 2ml of the formulated solution containing 5000IU hCG, so each 0.1ml solution contains 250iu hCG. If our dose is 500IU per day, 0.2ml of the finished solution should be taken each time.
If a smaller needle needs to be replaced, sterilize it.
7. Remove the poisoned syringe and extract 0.2ml of finished hCG solution. Use alcohol to disinfect the needle and the skin at the injection site. Then, the needle is inserted under the skin and the plunger is slowly pushed to complete the injection.
8. After the injection, put the hCG in the refrigerator for storage.