well, if you had no particular reaction to 50mg then just take 100mg instead. everyone is different, and i say your own intuition trumps my advice any time, but every indication so far just says go for it. i have had people have trouble with 50mg and they(amazingly) took my advice to bump it to 100and the problems went away. the problem is always the detox - the bad halogens and the mercury. 100mg protects from the bad stuff redepositing and it heads out the door in the urine. salt pushes are highly recommended, even without difficulties. youll see your urine darken and know the bromide is saying:
400mcg of selenomethionine the first year and then you can back off to 200mcg. brazil nuts arent enough, but keep eatin them.