These elixir tablets from Camelbak feature: Blend of electrolytes, vitamins and minerals to help maintain body fluid balance while keeping you on the go. Self-dissolving effervescent tablets designed for use w/hydration reservoirs. One tablet per liter of water. Sugar-free formula leaves no residue. Makes cleaning your reservoir easy. Tablets are stored in 4.25 x 1.25 in. plastic tube - easily fits into a backpack or jacket pocket. Vitamin C 86 mg, calcium 36 mg, magnesium 18 mg, manganese 1.4 mg. Made in USA.