Ever get a tingling sensation while getting your sweat on? The ingredients to your drink may be why.

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Sources:

http://www.livescience.com/53095-do-preworkout-supplements-work.html
https://www.ninds.nih.gov/Disorders/All-Disorders/Paresthesia-Information-Page
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3374095/pdf/726_2011_Article_1200.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4501114/pdf/12970_2015_Article_90.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3491570/pdf/nihms416104.pdf
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.520.4471&rep=rep1&type=pdf
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.287.7624&rep=rep1&type=pdf