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Fran Rowe

Fran Rowe

Dr. Fran Rowe, DVM, PAS — Equine veterinarian and nutritionist at Mad Barn, specializing in equine nutrition and high-performance support.

Jun 12, 2026

10:18
Is that totally off or is there some sort of ratio of how much is absorbed in the body based on synthetic versus natural sources?
10:27
That's a good question.
10:28
I don't know if I have a number right off the top of my head as far as like you need you know x amount of natural e is equivalent to y amount of synthetic e but generally speaking if the other ladies do have a number off the top of their head they can jump in but but yes in general you're you're absolutely right we we do recognize that there is a a significant difference in the bioavailability of these two different forms of vitamin E.
10:58
And so in general, sure, you will need potentially more synthetic vitamin E to kind of get that equivalent efficacy, I suppose, when you're comparing it to a natural source.
11:13
But we can definitely kind of back up a little bit and talk about the difference between synthetic versus natural because that is it's a big piece of of the vitamin e conversation for sure yeah so yeah so so the nomenclature surrounding vitamin e this will get a little into the nitty-gritty but i think it's good because because there's kind of some different terminology that gets thrown around and i think for you know without it being explained it it gets really confusing.
11:45
So we can kind of start from the beginning, but the nomenclature in terms of when we say natural versus synthetic, it's not just tied to marketing for a supplement or a product.
11:58
It actually comes down to the actual chemistry of the vitamin E.

11 MINS LATER

23:03
What kind of factors, you know, do different horses just as an individual absorb E differently? Are there certain conditions where you say like horses will absolutely need more E than another horse? Or what kind of factors can affect that case by case?

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