Sports drinks

[mr brightside]

I like XS energy drinks,
They use be Vitamins as their major source of energy,
They have zero sugar, zero carb, and caffeine levels of a cup of coffee....

Intriguing post, and one that appears to be based on whimsy rather than science. From Wikipedia...

B vitamins are also commonly added to energy drinks, many of which have been marketed with large amounts of B vitamins with claims that this will cause the consumer to "sail through your day without feeling jittery or tense." Nutritionists, such as Case Western University Professor Hope Barkoukis, dismiss these claims: "It's brilliant marketing, but it doesn't have any basis in fact."

Based on Prof Barkoukis' comment, i'd go a long way to avoid drinking one of those prior to a run; and i can't see how an energy drink containing zero carbs could provide any energy whatsoever. Perhaps the Dublin based personal trainer your signature is advertising could shed some light on things?