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Vitamin E is comprised of a group of compounds that include both tocopherols and tocotrienols. It is a potent antioxidant, preventing free radical damage to the body that is critical for your horse's health. Vitamin E is the exception to the concept that natural-source and synthetic vitamins are equivalent. The only form of alpha-tocopherol (Vitamin E) found in nature is the d-alpha-tocopherol known as RRR-alpha-tocopherol. Synthetic Vitamin E, also known as dl-alpha-tocopherol (or all-rac-), is produced from petrochemicals, resulting in a mixture containing equal amounts of eight stereoisomers. Only 12.5% of stereoisomers produced are identical to the d-alpha-tocopherol (or RRR-) found naturally in food. The mg to IU conversion factor for Stable Masters Choice©natural-source Vitamin E products is 1.36 IU per 1 mg (1mg d-alpha-tocopheryl acetate = 1.36 IU Vitamin E). Stable Masters Choice©Vitamin E is a concentrated form of natural-source d-alpha-tocopheryl acetate derived from edible vegetable oils. This unique product is produced by spray-drying d-alpha-tocopheryl acetate with a water-soluble excipient. This stable powder from vitamin E is particularly useful when a water-dispersible product is desired.


Horses are herbivores, which means they only eat plants to get energy and nutrients. They have evolved over the past 45 to 55 million years grazing, and their major source of nutrients is good-quality forage from hay or pasture. Vitamin E is a vital organic compound, which, when provided in the proper amounts, play a major role in the health of the horse. Horses that are in training, work, performing, travel, breeding or the physical and mental discomfort of a periodically empty stomach, lead to the formation of free radicals -volatile, destructive molecules that can potentially damage every tissue in your horse's body. Treatment of severe disorders such as equine motor neuron disease (EMND) or Equine Protozoal Myeloencephalitis (EPM) necessitates high dosages of vitamin E. Vitamin E will offer a level of protection against disease and disorders through its antioxidant activity –the ability to neutralize free radicals. Horses do not synthesis Vitamin E therefore they can only get the daily amount by grazing for a very long period up to 12 to 14 hours a day. Fresh grass contains approximately 110 IUs of vitamin E per kg of dry matter. If your 1100 lb (500 kg) horse spends all day on a healthy field of grass, a generalized level of consumption would be 22 lbs (10 kg) of dry matter each day. That equates to 1100 IUs of vitamin E. However, keep in mind that even if your horse is fortunate enough to have access to fresh grass at all times, the vitamin E content can vary with the grass’ maturity, the season, and amount of rainfall. Once fresh grass is cut, dried, and stored to make hay, it loses virtually all of its vitamin E content, making supplementation a necessity. Adding a commercially fortified feed will offer some vitamin E to your horse’s diet-the average feed contains 150 IU or less per pound. Therefore to obtain the same 1100 IUs as from healthy pasture, you would need to feed more than 7 pounds of feed per day –an amount too high for most horses. This is why supplementing them with Stable Masters Choice©natural vitamin E is essential for their well-being.


Use as directed by your nutritionist or local, attending veterinarian.

1 scoop (1.5 g) = 1,000 IU of Vitamin E. Mix in feed.

Maintenance: 1-2 scoops per day

Intense training: 3-5 scoops per day

Pregnant/lactating mares: 3 scoops per day

Foals: 3 scoops per day

Stallions: 3 scoops per day

Neurological challenges and other health issues: Consult your attending veterinarian.


The product should be preserved in tightly closed containers to protect from light, heat and air. Recommended storage temperature: 4-32°C (39-90° F). When stored unopened in original packing and under recommended storage conditions, the shelf life is 48 months from the date of manufacture.

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