BetterYou Magnesium Flakes – Relax and Replenish. Soak in the benefits of BetterYou Magnesium Flakes. Made with pure Zechstein magnesium chloride, these flakes dissolve easily in your bath or foot soak, helping to relax muscles and promote better sleep. Simply add 250g to your bath or 150g to a footbath, and enjoy 20 minutes of soothing relaxation. Relax and unwind with BetterYou Magnesium Flakes.