Strontium
Strontium is a mineral that is not classified as essential for the human body.
Strontium is widely distributed throughout nature. Strontium levels in the soil determine how much strontium will be in the foods grown in particular areas. Areas with strontium-rich soils also tend to have higher levels of strontium in the drinking water.
Osteoporosis Dental cavities
"Strontium is not an essential mineral, so deficiencies are not seen with this mineral."
"No recommended intake levels have been established for strontium, since it is not considered essential for humans. However, preliminary research in humans suggests that 600–1,700 mg of strontium, taken as a supplement in the form of strontium salts, may increase bone mass in the vertebrae of people with osteoporosis."
"No consistent toxicities from strontium supplements have been reported. At the time of writing, there were no well-known drug interactions with strontium."