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 individuals Effective for stress relief and relaxation Great for soaking muscles and joints Ingredients: Genuine Zechstein magnesium chloride flakes (and trace minerals), methylsulfonylmethane (MSM). Magnesium Bath Flakes Ultra: Approximately 15g elemental magnesium and 3g elemental sulfur (from OptiMSM) per cup. Product Application and Usage: Magnesium 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 minutemore. 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. Why choose Ancient Minerals Ultra with OptiMSM? MSM or methylsulfonylmethane is an organic sulfur compound known for a multitude of benefits. It is an important nutrient for joint mobility, muscle recovery, healthy skin, healthy aging, and immune system support. MSM also maximizes the benefits of exercise and fitness. Sulfur supports healthy skin, hair, and nails, whilst is also encourages detoxification and glutathione production contributing to optimal health. With a slightly lower magnesium concentration and the skin-soothing properties of sulfur, Ancient Minerals Ultra products are well-suited for those with sensitive skin.