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This blend is often preferred by athletes who take the supplement with the goal of enhancing their performance

Most patients rate discomfort at 1 to 3 on a 10-point scale, comparable to a pinprick or light burning sensation

Maturitas 58:174181

I wont put any specific recommendations for caffeine here because there are plenty, just be sure to use it wisely if you are going to use it at all

[Link] These results indicate that ALCAR increases synaptic neurotransmission in the brain and consequently improves learning capacity in aging rats. Hoffman, JR, et al, The effects of acute and prolonged CRAM supplementation on reaction time and subjective measures of focus and alertness in healthy college students. in Journal of the International Society of Sports Nutrition , Volume 7, issue 39, December 2010