I don't know for sure but yes, there is certainly a possibility that ultracarbon will prevent your propecia from being fully taken up. The good news is that you don't have to worry about missing one or two days of propecia. It won't make any real difference.
Personally though I wouldn't recommend ultracarbon. Did your doctor tell you to take it? If so then go with his / her advice, not mine. But if it's something you decided to try on your own then you're better off not using it. Do you have food poisoning?