Magnesium can be used to support bone health, energy metabolism, neurotransmission and muscle contraction (including the heart muscle). SUITABLE FOR VEGETARIANS & VEGANS.. Take one caplet daily, preferably with a meal.Do not exceed stated dose. The Cardio Vascular Health range at Holland and Barrett consist of a selection of supplements which can help keep your heart healthy. The Cardio Vascular Health range includes supplements such as Coenzyme Q10, Folic Acid, Magnesium and Flaxseed Oil.