Animal Essentials' Calcium is a natural calcified red seaweed.  It contains a wide variety of essential nutrients, including calcium, magnesium, boron and zinc.  It is harvested from the seabed off the coast of Iceland.  Each batch is cleaned, heat processed and tested for purity by an analytical laboratory.  It is certified clean and is highly digestile and environmentally sustainable.  
 
Typical Mineral Analysis – Per Teaspoon
 Calcium ........................................ 1000 mg
 Magnesium ..................................... 100 mg
 Phosphorus ...................................... 24 mg 
 Sulfur ................................................ 14 mg
 Potassium .......................................... 3 mg
 Boron .............................................. 75 mcg
 Zinc ................................................. 66 mcg
 Iodine .............................................. 60 mcg
 Selenium ........................................... 3 mcg