Night Cramps Forte – Leg Cramps At Night The exact cause of muscle cramps is unknown. However, risk factors such as certain medications and low levels of minerals, such as electrolytes have been cited as a cause of leg cramps. Crampeze offers a wide range of muscular cramp relief products that fit in with your lifestyle and preferences. Crampeze products provide Magnesium supplementation and contain Viburnum opulus (Cramp bark), which is traditionally used in western herbal medicine to help relieve muscle cramps and mild muscle spasms & twitches. Crampeze can be taken every day and easily fits into your routine. Live your life cramp free from today.