Eucommia

Might be worth a shot.

“Remarkably, combination of DHT and the E. ulmoides extract in the presence of the AR led to increases in AR-mediated reporter gene expression ranging from 112% to 204%, even at saturating levels of DHT (figure 8). This potentiating effect was a tripartite synergism between the AR protein, its cognate steroidal ligand and E. ulmoides’s extract. This is highly unusual as normally, androgen-mediated AR transcriptional capacity, akin to all ligand-dependent steroid receptors, plateaus at saturating doses of its cognate ligand. A similar synergistic effect was observed when E. ulmoides extract was tested in combination with estradiol in the presence of the estrogen receptor (ER) α (figure 9).”

biomedcentral.com/1472-6882/7/3/