Go slowly. Start with one cell salt (like an overall one like Jackson's 12 in 1) and see how it goes. Reduce the dose. Take 2 pellets instead of 4. Dissolve dose in water. Stir well in a small amount of water (50 ml) before drinking. Hold liquid in mouth for 15-30 seconds before swallowing. Give enough time for absorption. Wait 15 minutes before and after dissolving in mouth before eating or drinking. Water is fine 5 minutes after or right before taking. Use a pure cell salt brand. If you are sensitive there is a good chance you could react to lactose and the other fillers and additives in other cell salt brands. Jackson's Mineral Salts is proud to be the only Certified Vegan (vegan.org) Schuessler Cell Salt brand in the world.