The 6 Best Vitamin E Supplements for Horses of 2026

Sixty-four days is an unusually specific claim to print on a bucket, and it's the useful one: it tells you how long four pounds lasts at the label rate instead of leaving you to work it out. That's a sensible trial window, long enough to judge a change in condition and short enough that you aren't committed to a year of something that isn't working.

The formula itself is straightforward. Each ounce carries a guaranteed minimum of 1,000 IU of vitamin E and roughly a milligram of selenium, and the powder sits on a yeast culture base that's there for palatability and digestion as much as for nutrition. It mixes into grain without clumping, and the horses we fed it to treated it as part of the meal.

We like this as the practical entry point to a combined formula. It does the same two jobs as the premium selenium products here for noticeably less money, and the yeast base means you aren't negotiating with the bucket every morning, which in our experience is the difference between a supplement that gets fed and one that sits in the tack room.

The caveat is selenium itself, and it isn't small. A combined formula assumes it's the horse's only source, so add up what's in the ration balancer, the hay, and anything else in the feed room before committing. If selenium is already covered, buy a plain vitamin E instead and dose it freely.

Elevate Se is our top pick with selenium added: the same natural vitamin E base, plus organic selenium yeast. For a horse that needs both, that's the whole pitch, and it's a good one.

We think the selenium source is what separates it from the cheaper combinations. Organic selenium yeast is a different ingredient from the selenium salts used in some rations, and this formula was put together for performance horses, breeding stock, and horses with no pasture access, three groups most likely to come up short on forage alone.

In the bucket it behaves like the rest of the Elevate line: unflavored powder, no fuss, and even our pickier eaters finished their grain. That sounds like a small thing until you've thrown away a tub of something a horse refused.

One limit worth knowing is that the ratio is fixed, so you can't push the vitamin E higher for a hard-training horse without pushing selenium up with it. If you need more E than the label allows, plain Elevate plus a selenium source your vet doses separately is the better setup.

Some horses eat around a powder no matter how patiently you mix it, which is exactly what we watched happen with a few of ours before switching to pellets. Farnam's Vita-Min E & Selenium goes into the bucket as small alfalfa-flavored pellets rather than a dusting, so a horse that sorts has far less to sort, and that one difference is why it belongs here even though its numbers look familiar.

Familiar is the right word. Each half-ounce serving carries a minimum of 625 IU of vitamin E, which is 1,250 IU per ounce once you do the conversion, and the three-pound tub is built as a 96-day supply. Serving sizes printed in half ounces make a pellet look weaker than it is; ounce for ounce it holds its own against the powders here.

What we appreciated in practice: pellets don't coat the bucket, they sit in it, so there's no gray film to scrub and no argument about whether the horse got the dose. The alfalfa flavor does the rest by reading as feed rather than as medication.

Twenty pounds is less a supplement than a commitment. At the label rate this tub is meant to cover 640 days for one horse, nearly two years, and that only sounds excessive until you're the one ordering for a whole field.

Numbers first: 625 IU of vitamin E and 1 mg of selenium per half-ounce serving, fed as crumbles rather than powder or pellets. Crumbles sit between the two textures, coarse enough that they don't sift through the grain and soft enough that a horse doesn't have to work at them.

We like it for the barns, plural. One scoop, one tub, and a field covered without a reorder every other month is what a boarding or breeding operation actually needs, and the crumble texture is forgiving of the horses that pick through their feed.

For a single horse the arithmetic doesn't work the same way. That's two years of feeding from one open tub, and the smaller formats here finish in a season or a quarter. Buy this one when there are several mouths in the bucket line.

Twelve hundred fifty IU of vitamin E per ounce, a 2.5-pound tub, and the lowest price of anything here: AniMed is what you buy when the goal is getting vitamin E into a horse economically. It's a plain powder with nothing else in it, so it stacks with whatever else is already in the ration without doubling up on selenium.

What the label doesn't spell out is whether that vitamin E is natural or synthetic. For a horse on a long-term, high-dose protocol, the source is worth confirming before you commit; for a herd on a maintenance ration, the IU per ounce is what you're buying, and this powder delivers it without a premium.

In the bucket it behaves like any plain powder: it mixes into feed, and the horses we fed it to ate without hesitation. Two and a half pounds sits between the small tubs and the bulk buckets here, a sensible middle for a couple of horses.