Not only is it incredibly safe to take when you are pregnant, but many doctors often encourage taking it to help moms to be deal with the negative side effects of pregnancy such as muscle cramps, and also help protect the health of the baby. Since it is a nutrient that is found in many of the common foods that we eat, lower dosages are always going to be considered safe. Many of the products that we found out there on the market could actually be used by children under the age of 4. For smaller kids, many companies suggest their dosage be between about 50-85 mg.