Abstract: Aqueous caffeine solutions containing a co-solubilizing agent selected from niacinamide, nicotinic acid and mixtures thereof present at a level up to the maximum concentration soluble in water and in a weight ratio to caffeine less than 1.50:1, wherein the caffeine is present up to the maximum level between about 2 and about 20 percent by weight that is water-soluble in combination with the co-solubilizing agent and the solution is buffered to a pH less than about 6. Methods for preparing the aqueous caffeine solutions of the present invention are also disclosed.