Strontium is a naturally occurring mineral present in water and food. Trace amounts of strontium are found in the human skeleton. Strontium has an affinity for bone and is taken up at the bone matrix crystal surface. The influence of strontium on bone metabolism has been researched since the 1950's. Recent studies show that strontium positively affects bone metabolism to support healthy bones. Strontium citrate supplies strontium that is safe and suitable for consumption as a dietary supplement. This form strontium is entirely different from the radioactive strontium-90 formed by nuclear fission. Supplement Facts Serving Size 1 Cap Servings Per Container 60 Amount Per Serving Strontium From Strontium Citratenbsp 340mg Other Ingredients Modified Cellulose Vegetable Capsule, Cellulose, Magnesium Stearate Vegetable Source. Directions: Take two capsules daily with or without food. Take at least the daily RDI of calcium. Do not take this product at the same time a calcium supplement is take