Magnesium bath flakes, sometimes called magnesium bath salts, are a highly concentrated form of magnesium supplementation, designed to be added to a bath or footbath. Soaking in a magnesium-rich bath helps promote relaxation and soothe tired and aching muscles. Allowing full body exposure to a concentrated solution of magnesium chloride. A gentle and effective method of supplementation. Help recharge and recover after exercise with a sports supplement soothing magnesium flakes bath.