Kneipp Draining 20 Effervescent Tablets Pineapple Flavor. It is a food supplement formulated with magnesium, calcium, vitamin C and E and nettle leaves that helps those people who suffer from fluid retention. Magnesium: Helps electrolyte balance. Calcium and vitamin C: They contribute to a normal energy metabolism. Nettle: Promotes circulatory well-being and favorably influences blood circulation. How to use: take 2 times a day one tablet dissolved in a glass of water.