The central ingredient in most energy shots is caffeine, the same stimulant found in coffee or tea.
5-Hour contains vitamin levels sometimes hundreds of times higher than the recommended RDA, according to a 2010 test by ConsumerLab.com.
Vitamin based energy shots have variable benefits dependent on the additional ingredients.
[citation needed] The idea of energy shots started decades ago in Japan, where small “tonics” became very popular among consumers, served highly concentrated and without carbonation.
[6] Although originally marketed in the US, energy shots are also becoming popular in other parts of the world, such as Europe,[7][8][9][10] The products are aimed at customers who seek high efficacy with little liquid intake, and include truck drivers and students.