Cleanmarine Magnesium (60). Cleanmarine Magnesium is highly absorbable 100% pure Magnesium Citrate in capsule form, to support sleep, the nervous system, muscles, blood sugar regulation and bone health.. Magnesium is one of the most popular supplements to take due to its multi-functional role in the body. Magnesium is a micronutrient and the fourth most abundant mineral in the body, with the majority found in the skeleton and the rest in muscle, soft tissue, and blood. Magnesium plays an important role in assisting more than 300 enzymes to carry out various chemical reactions in the body such as building proteins and strong bones, regulating blood sugar, blood pressure, and muscle and nerve fu. Recommended Use. Adults: Take 2 capsules a day with food, can take30mins before bed to help sleep issues, before or after exercise to help reduced cramping and tiredness & fatigue.