Overview Swisse Nutra+ Advanced Mag Night contains magnesium, passion flower, and California poppy to maintain muscle health and reduce mild muscle cramps and spasms, and support healthy sleep while relieving restlessness and sleeplessness.Swisse Nutra+ Advanced Mag Night is a high-potency night formula that maintains muscle health and supports refreshing sleep. Scientifically formulated with two forms of magnesium, it maintains healthy muscle function, and reduces muscle cramps and mild muscle spasms when dietary intake is inadequate. It also contains California poppy, which is traditionally used in Western herbal medicine to support healthy sleep patterns and reduce restlessness.