Magnesium Flakes, Better You (250g). BetterYou Magnesium Flakes can be added to your bath to help soothe tired and aching muscles for the ultimate relaxation.. Pure Zechstein Inside® Magnesium Flakes. Promotes natural relaxation. Soothes aching and tired muscles. Suitable for baths and footbaths. Effective magnesium absorption. Fully recyclable packaging