NOW Effer-Hydrate Effervescent Mixed Berry Tablets provide excellent, balanced support for any active lifestyle. Carefully designed to help the body rehydrate and recover, these tablets are a great option for serious athletes and exercise enthusiasts alike. They include calcium, magnesium, sodium and potassium, four important electrolytes that the body needs to function optimally. The tablets dissolve perfectly in 16 ounces of water and have a delicious berry flavor while containing less than one gram of sugar and zero caffeine.