This stuff is dangerous.
As an idiot grad student, I thought this was a good idea since I was losing time to exercise and needed more energy. My sister and I did this together and totally regretted it.
For one, you are so jittery that holding a pen the first week is a challenge. The energy boost was there but felt very strange. And after a month on this I started having chest pains! Yeah, a 21 year old woman in good health with chest pains. Not good. So I stopped. My sister had the same issue and ended up at the doctor with a small heart murmur. Which subsided after she stopped use.
No thank you.