Doctor's Best® Strontium Bone Maker (340 mg) is a nutritional supplement that provides the body with strontium, a naturally-occurring mineral found in water as well as foods, to maintain strong and healthy bones. Traces of strontium are normally found in the human skeleton as strontium has a strong similarity to bone and is absorbed by the bone matrix crystal surface. The effect of strontium on bone has been studied since 1950s, and research has shown that strontium influences bone metabolism positively by encouraging bone development and diminishing bone desorption to produce a regulated bone intensity.