I don't have the answer because we don't have enough data, hence why I'm not using it as a monotherapy.
We know that RU58841 is 40 times stronger than CB (same affinity for the AR as testosterone, while CB is 1/40 of testosterone).
Some people reports success with RU alone, some don't. So if you use 2 ml of 7.5% of CB, you are using 3 times the dose that's usually being used with RU, while the difference in AR binding is 40 times less than RU.
Just based on plain math you will need way more, yet the first months of CB on trials looked promising. There could be a synergistic effect with CB helping with inflammation, due to its corticosteroid metabolite, but it's pure speculation at the moment.
On top of that, you have the possible AR upregulation both with RU and CB.
So we are still shooting in the dark. You are safer stacking things up as I have always said.
P.S.: Cassiopea is marketing it as an alternative to finasteride, not a complementary treatment, so I'm really curious to see how they will justify that on studies regarding the DHT inhibition.