Uh, tanning while taking thermogenics... I'd say risky (I'm not a big believer in tanning anyway due to the health risks but that's another thread). Make sure you stay EXTREMLY Hydrated! Just to be safe... you don't want to overheat yourself.
lol... glad you're enjoying the Rexin', it is quite fun. Depending on when you like to go to sleep.... Ex: I try to go to be by 10:30/11:00pm ... so I can NOT take any Rexin' after 4:00pm... otherwise I stare at the ceiling til' wee hours of the a.m.