There are a select few who only find libido when HCG is added to TRT, Nelson Vergel went for years on TRT in isolation and lost libido after many years, tried HCG when younger and didn’t do well on it, then revisited HCG later in life and libido came back online when HCG was added to his TRT protocol.
Something obviously changed as Nelson aged. TRT suppresses LH which can affect other downstream hormones, this LH deprivation over time will see other hormone decline, most don’t notice it right away and others will as they age.
You may need to inject daily or EOD HCG doses to control estrogen.