1. The worst magnesium: Magnesium oxide is the worst yet most common magnesium supplement. It only has a 4% absorption rate. It’s also very expensive! 2. Magnesium sulfate has a 10% absorption rate and a high laxative effect. It may help relax your muscles superficially. 3. Magnesium orotate has a 15% absorption rate. This form of magnesium can penetrate the cells and increase energy. Magnesium orotate also works as an antioxidant and supports DNA. 4. Magnesium taurate has a 20% absorption rate