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The same high potency magnesium chloride as our best-selling magnesium bath flakes, but with elemental sulfur.. Ancient Minerals®magnesium bath flakes ultra, utilize premium distilled OptiMSM®and pure magnesium chloride. Without sufficient MSM sulfur, your body cannot maintain an appropriate level of homeostasis, and OptiMSM®has earned the reputation for the purest, safest, and most consistent MSM in the world.Ideal for children and other sensitive individualsEffective for stress relief and relaxationGreat for soaking muscles and jointsProduct Application and UsageMagnesium bath flakes, or bath salts, are pure magnesium chloride for rapid absorption. Simply dissolve 1-3 cups or more of the magnesium flakes into a warm, but not hot, foot bath or tub bath, and soak for 20 minutes or more. Following the bath, rinse with warm water and pat dry. For foot soaks, dissolve up to 3 cups. For body soaks, dissolve up to 6 cups.Magnesium Bath Flakes Ultra: Approximately 15g elemental magnesium and 3g elemental sulfur (from OptiMSM®) per cup.