FRS products, put the powder in my water bottle and tastes good even when water gets warm. Also doesn't cause the increased heart rate, effect is noticable in performance, not in increased heart rate, check it out.
I would suggest to all to beware of drinks and gels especially to watch out for the sugar content. Sugar causes metabolic crash, and there is an epidemic of cavities in athletes using high sugar content drinks, bars and gels, even those who never had a cavity in their life. The acid content is also a problem as it dissolves the enamel off your teeth, not a good thing.
Ok, I'll get of my Dentist soap box, but if you had seen what I have in this area you would understand.
DrB (DDS)