Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
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All the best,
Dr. Getty
Hi Gina,
Actually they both have a similar amount of magnesium. The CarbX has 6,000 mg per ounce serving; the DCarb Balance has 2665 mg per 2 ounce serving and it is recommended that you feed 4 ounces per day.
The choice really would depend on whether or not you're already feeding a vitamin/mineral supplement. If you are, then go with the CarbX since it is not a vitamin/mineral supplement, but rather offers mineral, antioxidant and herbal support for insulin resistance.
If you are not, then go with the D Carb Balance. You can also add Carb X to D Carb Balance since more magnesium is usually appropriate for the IR horse and the herbs are also helpful in lowering circulating insulin levels.
All the best,
Dr. Getty 
Author of Feed Your Horse Like A Horse
Where are you from? Bayfield, CO