I haven't noticed any problems with using my normal deodorant, etc. I'm not sure about sunscreen, however -- the couple of days I used it, I seemed to stall. But I was also walking around in the sun all day, excercising, so that might have been it, too.
And btw, I don't know if there's a thread about losses for men. This is my second round -- the first was 32 days. I lost 24 pounds, exactly -- which was terrific. But it wasn't that 1 pound + a day that the women are so jealous of. This round, I've lost 10.2 pounds in the first 15 days. Again, terrific, but it's about 2/3rds of a pound a day. Either I'm atypical or not.