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Being tired or drained is simply not fun, especially if you want your brain working at its highest performance level.
That's why caffeine is consumed by millions worldwide. It's an efficient natural stimulant that is well tolerated by many people, and Caffeine can definitely give you a nice edge on your energy levels. Numerous studies have shown that Caffeine supplements increase energy and concentration. 
But it's not the type of energy and concentration you want for productivity.
On its own, Caffeine is not a great cognitive enhancer. Users often experience a jittery or anxious mental state followed by a crash, especially in people that have built up a tolerance. Drinking a sugary coffee or energy drink doesn't provide the type of energy and concentration you need to get things done. That's why we include L-theanine (L-tay ah neen) in SMART CAFFEINE™. It's a naturally occurring amino acid with benefits that include mental relaxation, reduced stress, improved working memory, enhanced learning, and perhaps most importantly, increased alpha brain wave activity. 
Independently, Caffeine and L-Theanine have somewhat polar effects on the mind and body. However when the two are combined the effects do not simply negate one another. Instead they work together very synergistically, allowing the user to fully benefit from the positive aspects of both compounds without the negative side effects. The energy and motivation from the Caffeine is harnessed and smoothed over with L-theanine.
This Natural Stack provides a clear and focused energy feeling, rather than the short-lived stimulant rush of Caffeine by itself.
Many scientific studies have shown that SMART CAFFEINE's ingredients, Caffeine and L-theanine, have the following benefits when taken together; increased focus and alertness , improved cognitive function , enhanced short-term memory retention , more ability to ignore distractions , no overstimulation .