My doctor always told me inject hcg in the morning a day before and 2 days after test. Hcg mimics lh and make the leyding cell boys pump more test and prevent shut down of Htpa
also prevents the dips in test levels when the test shot is in. (In the morning to prevent estrogen spikes or intertrsticulAr estrogen production and replicate natural test production) my doc always said that hcg is a better anabolic then test ( debatable) his reason is that its not a synthetic if your body produces test naturally with hcg the body respects it own test production more. Less sides.