Kneipp Draining 20 Effervescent Tablets, Pineapple Flavor. This dietary supplement is formulated with magnesium, calcium, vitamins C and E, and nettle leaves to help those suffering from fluid retention. Magnesium: Helps electrolyte balance. Calcium and vitamin C: Contribute to normal energy-yielding metabolism. Nettle: Promotes circulatory well-being and has a positive effect on blood circulation. How to use: Take one tablet dissolved in a glass of water twice a day.