Rrunn caffeinated electrolyte salt caps are electrolyte capsules with a unique formulation that deliver the full-spectrum of vital electrolytes (sodium, chloride, potassium and magnesium), caffeine for enhanced mental alertness, and vitamin d3 to sustain optimal bone health and immune function during intense endurance activities like ultramarathons, brevets, and triathlons. Rrunn caffeinated electrolyte salt caps are highly bio-available, immediately releasing an instantaneous supply of essential fuelling nutrients.