Holland & Barrett Magnesium 375mg 30 TabletsnHolland & Barrettu2019s Magnesium tablets contain 375mg of Magnesium to support healthy bones and muscles, as well as helping to reduce tiredness and fatigue. Magnesium is one of the most abundant minerals in your body. It helps with hundreds of processes, including helping enzymes that are responsible for converting food into energy and extracting nutrients.n--Contributes To the Maintenance of Normal Bones and Musclesn--Contributes To the Reduction of Tiredness and Fatiguen--Suitable For Vegetarians and Vegansn Benefits of This Supplementn--Magnesium is important when it comes to strong bones and healthy teeth.