My Best Horse

MagOx Elite:

Magnesium 59.4%

Food Grade, Ultra-Pure, Low Iron – packaged for horses!


My Best Horse magnesium oxide is ultra-pure and low in iron, with only about 12 mg of iron per 10 gram serving. This is suitable for supplementing horses which have iron overload.


A white powder, magnesium oxide is readily absorbed in horses. The majority of magnesium in the horse’s body is located in the bones and muscle. It plays a role in electrolyte balance within the body.

As a cofactor, it affects enzyme reactions, such as:

  • Kinase B
  • Hexokinase
  • Creatine kinase
  • ATPase
  • Na+/K+ ATPase


Other areas in which it plays a role:

  • Membrane function
  • Cell adhesion
  • Muscle contraction/relaxation
  • Neurotransmitter release
  • Structural function of the mitochondria

Magnesium plays a role in over 300 different reactions in the body and is commonly used as a calming supplement. However, additional research is needed to determine the validity of this usage, as well as efficacy.


Care should be taken, upon supplementation, to keep the Ca:Mg ratio at about 2:1.

For more information on the role of magnesium in the body, the Clinical Kidney Journal has an excellent review at


Manufactured in Michigan, USA.

MagOx Elite can be fed at the rate of 1-2 tablespoons per day, or as directed by your veterinarian. It is available in a 2 lb size, or the value 5 lb size.

Recommended dosage amounts:

10-20 grams per day.

Density of this product:

Approximately 10 grams per US tablespoon.


This product is not intended to diagnose, treat, cure or prevent any disease.