Unfortunately the manufacturers of Flash Power have not disclosed the levels of caffeine in their product.
Flash Power Energy drink (and Flash Power Light) contains as "much caffeine in 1 can as does a cup of coffee".
This could mean anything from 40-100mg caffeine.
Flash Power is free of sodium.
DISCONTINUED It appears this product is no longer available.
Ingredients in Flash Power
Water, sugar, glucose, citric acid, taurine, glucoronalctone, caffeine, inositol, caramel coloring, artificial flavor, niacin, panthothenic acid, riboflavin, vitamins B6 & B12.
Sugar content: 29 grams (per 8.4 ounces).Compare sugar levels of other drinks