cycle between pre workout supplements?

[Ryan]

i am currently taking jack3d and after a week i am on 2 scoops so i am going to try xpand next. what i am wondering is is there any reason i should take a few week break or anything after i am done taking jack3d before i start xpand. i am not wondering about supplement effectiveness just health reasons such as liver or kidney health, because pre workout supplements do put stress on your body. i have maybe 2 weeks left with jack3d. any answer is well thanked