Get relief from muscle cramps when your dietary intake is inadequate, with Blackmores Bio Magnesium. These high dose tablets reduce muscle cramps, tension and stiffness. Formulated with quality ingredients, it delivers a high dose (301.5 mg) of magnesium to support your heart and nervous system health. It also includes two forms of magnesium and extra nutrients, including vitamins B6 and D3. If you need relief from muscle cramps, tension and stiffness, adults should take 1 tablet , once a day. Reduces muscle cramps, tension & stiffness when dietary intake is inadequate. Supports bone health Supports heart health Supports muscle health Supports muscle function Supports nervous system health. Supports general health and wellbeing.