you might not "feel" anything at all at that dose. i wouldnt, but i have a high tolerance for all types of stimulants. the feeling of clen, if you fel it, will be a little bit jittery, maybe a bit lightheaded type of head ache, youll get dehyrated if you dont drink some water and that will give you a bad headache, youll get some mild cramps... but thats only if you are sensitive to the effects or you use alot of it.