My most productive supplement stack was a Blueprint run with Kre-Anabolyn/Adaptogen N. In The Blueprint, I spoke to the possibility it was due to the L-dopa as found in KA potentiating the androgenic horsepower of Adaptogen N. It appears there is evidence this may be the case, per the following "interactions" listed for L-dopa in at least one database on the plant:
Interactions:
May potentiate androgenic medications.
May potentiate insulin and antidiabetic medications.
Will potentiate levodopa medications.
Interesting too, the part about "may potentiate insulin and antidiabetic medications". Those would be 4-hydroxy-isoleucine and Rhaponticum Carthamoides, both of which are found in the formula and have significant glucose disposal actions.