I agree, 20 grams would probably prevent gyno, but it is a bit excessive.
Do you mean milligrams?
He should stay away from nolva if using deca anyway.
Edited..thx bro...
yes i agree, 20mg may be excessive....i find 10 does the trick if my nips get sensitive and I wouldnt recomend nolva with a nandrolone...didnt see he was using deca...good update