Calcium oxide is a natural form of calcium. Calcium pantothenate is a high potency, synthetic source of vitamin B5. Calcium phosphate is a calcium salt found in or derived from bones or bone meal. Chloride or Chlorine is an essential mineral, usually found in compound form with sodium or potassium. Choline is a B vitamin found in eggs, liver and soy.
Choline chloride is a high potency, synthetic source of choline.
Cobalt is a trace element, an essential mineral and integral part of vitamin B12. Copper is a trace element, an essential mineral that can be toxic in excess. Copper carbonate is a natural form of copper. Copper gluconate is a synthetic form of copper. Copper sulfate is a synthetic form of copper.