I work in an automotive supplier's machine shop, so I have to stay attentive all night and these pills did not let me down.
I've taken other caffeine pills in the past and found that while they work, I would often crash from them or would get massive heartburn. These Kaizen pills do not have the burn and I have yet to crash after their use. I find the "come down" easy and steady, leading me into a peaceful sleep, come morning. Great product, well priced and easily available all over the county.