Monosodium Phosphate

Monosodium Phosphate is a supplemental source of phosphorus. Some equine diets, especially those based on alfalfa, are high in calcium but relatively low in phosphorus. This imbalance can interfere with bone development, energy metabolism, and mineral utilization. Supplementing with Monosodium Phosphate helps restore the proper calcium-to-phosphorus ratio without adding excess dietary iron, making it a better option than other phosphorus sources like monocalcium phosphate.

Phosphorus is critical for skeletal development, energy production, and cell membrane integrity. Alongside calcium, it forms strong bones and teeth and is required to produce ATP, the molecule that fuels muscle contraction. Horses that do not receive enough phosphorus may experience reduced growth, poor performance, or skeletal abnormalities.

The best sources are highly bioavailable and low in contaminants like heavy metals or excess iron. When balancing a diet to improve dietary rations, Monosodium Phosphate is preferred over monocalcium phosphate because it provides phosphorus with minimal calcium and iron. Forages and grains naturally contribute phosphorus, but additional supplementation is often needed when feeding calcium-rich diets such as alfalfa hay.

Calcium-to-phosphorus ratios for horses can range between 1.2:1 and 4:1. Adult horses can tolerate higher ratios, although the ideal ratio in growing horses is often considered to be between 1.5:1 to 2:1. The diet should always contain more calcium than phosphorus, but not in extreme excess. Growing horses, broodmares, and performance horses may have slightly higher phosphorus needs, so maintaining proper balance is especially important in these groups.

Possible signs of low phosphorus intake include weak or soft bones, reduced growth rates, poor skeletal development in young horses, muscle weakness, stiffness, or poor performance. Because these issues can mimic other nutritional deficiencies, it’s best to confirm through a full diet analysis.

Both are used to provide phosphorus. Monocalcium phosphate also supplies a calcium source, so if you’re adding phosphorus to adjust the Ca:P ratio it’s usually easier to do so with monosodium phosphate, which doesn’t add extra calcium.

Yes. When fed at the recommended rate, Monosodium Phosphate is safe for broodmares. Phosphorus is essential for fetal growth and milk production, but it must be balanced with calcium to prevent skeletal issues in foals. Always review the full ration with a nutritionist to before adding phosphorous to the diet of a growing horse levels.

Yes. Monosodium Phosphate contains only phosphorus and sodium and does not add sugar, starch, or fillers. It can be used safely in horses with insulin resistance (IR), PPID, EMS, or laminitis when part of a properly balanced diet.

Yes. There are no known interactions between Monosodium Phosphate and common equine medications. If your horse has a specific medical condition, consult your veterinarian before making dietary changes.

This supplement comes as a fine powder that can be top-dressed on feed or mixed into soaked hay cubes, beet pulp, or grains. Because it is a concentrated mineral source, consult a nutritionist to determine the correct feeding rate for your horse’s diet.

Mad Barn’s Monosodium Phosphate is a powdered supplement. Each container comes with a scoop for easy measuring. One scoop provides approximately 30 grams of powder. For accuracy, it is best to weigh the supplement on a scale to match your horse’s diet plan.

Yes, like all natural mineral products, this supplement contains very small amounts of iron. However, it is significantly lower in iron compared to monocalcium phosphate, making it the preferred option when you want to add phosphorus without contributing excess iron to the diet.

Yes. This product contains no prohibited substances and is competition-legal for horses across all disciplines. Regulations can change, so always confirm with your sport’s governing body.

Monosodium Phosphate has a guaranteed shelf life of two years from the date of manufacture, which is printed on the packaging. Store in a cool, dry, temperature-controlled environment with the container tightly sealed to prevent clumping and moisture absorption.