Strontium is a naturally occurring trace element that is chemically similar to calcium. However, because of their few differences (e.g., size), strontium and calcium aren’t biologically equivalent, and they can compete for absorption and utilization in the body.[1]
A typical diet contains 2–4 mg of strontium per day, mostly from plant-based (grain and vegetable) sources.[2][3] However, estimates have ranged from 1.4–5.7 mg per day, too.[4] The amount of strontium in a given food source varies by the amount of strontium in the soil, which may explain the variability in intake estimates.[2][3]