I used castor oil topically and I am definitely a fan. I'm currently doing it orally. The reason I stopped doing it topically is that it made my scalp and hair too greasy, hard to wash out. But I do believe it definitely assisted the wound healing and improved the quality of hair. Just hard to deal with cosmetically. It would probably be great if it could be mixed into some kind of vehicle.
CB is supposed to be similar to RU, albeit weaker, but with less sides. However it's quite expensive. I haven't tried it.
Maybe try fluridil or alfatradiol for an antiandrogen, could try stemoxydine for a growth stimulant. All of those have low side effect profiles.
Are you having sides from finasteride? Sometimes people use it topically and they go away.
I already have a bit of side from finasteride (the usual ones like libido) and probably not responding well due to increase inflammation on the scalp (not sure if it's because of other underlying issues like thyroid problems). Most people say to give finasteride at least 8 to 12 months, but I don't know if I am willing to gamble on that.
I really hope the biestro, keto cream and dermarolling will show slight improvements to my density and hairline.