topical hair loss

I think I'm going to give this a try: Hair Restore Ultra Scalp Solution - 60 mL Dropper Bottle of Minoxidil / Azelaic Acid / Finasteride / Ketoconazole 5/12.5/0.1/2% I'd like to get the finasteride component down to .05 or .025..... What is a good vehicle to mix with this... I was thinking of...