Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hi Marcy,
Thank you for writing about your mare and her allergies. You're certainly doing the right thing by giving her antioxidants. The only question would be, are you giving her enough? She should have at least 2500 to 4000 IU of vitamin E per day. But, since you're also giving her selenium, with her vitamin E, I wouldn't recommend increasing your current supplement. Instead, you can add additional vitamin E by itself. E5000 is such a supplement.
Vitamin C is also helpful. But, since she is producing enough of her own, she may already be getting enough extra.
Grapeseed extract is also helpful. But, I would suggest trying Noni Juice. I am currently testing a noni juice extract on my own horses as part of a new product testing program. And, the reason I'm enthusiastic about it is because Noni Juice is a very potent source of several micro-nutrients, as well as antioxidants. So, you may want to add 1/2 cup to each meal.
Allergy testing may also be helpful, since you may be feeding her substances to which she may be allergic.
I hope this is helpful!
Dr. Getty 
Where are you from? Bayfield, CO