Date published: 2025-9-16

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Selenium Supplement for Horses – UltraCruz®

by Santa Cruz Animal Health
5.0(84)
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Selenium supplement for horses to help maintain selenium-supported normal body function and provide antioxidant support
    • Ideal for performance horses in rigorous activity or living in Selenium deficient areas
    • Contains organic Selenium, an important antioxidant and trace mineral that may help reduce the negative effects of oxidative stress
    • Provides Selenium as an easy to use pellet, or pure powder form
    • Developed and manufactured in the USA with globally-sourced ingredients by Santa Cruz Animal Health
    • Highly recommended by others, see testimonials in tab below
    • Same day shipping on orders received before 3:30 PM Central Time Monday-Friday.
    • DISCOUNT: Bulk orders of UltraCruz® Animal Health products totaling $500 or more receive a 5% discount.
Catalog #DescriptionPriceQtyAutoshipCARTFAVORITES
sc-516463
10 lb, Pellets, 80 day supply
$16.95Autoship: $16.10
sc-516464
25 lb, Pellets, 200 day supply
$34.95Autoship: $33.20
sc-363248
1 lb, powder, 377 day supply
$29.95Autoship: $28.45
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UltraCruz® Equine Selenium Supplement for Horses

  • Important antioxidant and trace mineral
  • Can help protect against free radical damage
  • Helps provide muscle and joint support
  • Aids normal metabolic function
  • Can promote reproductive health

UltraCruz® Equine Selenium Supplement for Horses is an equine dietary supplement that provides organic Selenium, an important antioxidant and trace mineral for horses that helps provide the body with nerve, muscle and joint support. In addition to helping to reduce oxidative stress, Selenium supports breeding performance and normal metabolic function. Performance horses participating in rigorous activity can benefit from additional antioxidant supplementation. This palatable powder formula may be especially beneficial for horses living in Selenium deficient regions.

Selenium Supplement for Horses - 3 horses in a field on San Juan Ranch

What is an antioxidant?

Antioxidants such as Vitamin C, Vitamin E and Selenium are substances that neutralize free radicals to support healthy tissues and organs on a cellular level. Antioxidant support is recommended for horses subject to rigorous exercise and may help to reduce the negative effects of oxidative stress.

What is a free radical?

Free radicals are highly reactive chemicals with the potential to cause damage to cells. Free radicals can be produced naturally by the body during times of heavy exercise.

For a comprehensive antioxidant formula, we suggest UltraCruz® Equine Selenium Supplement for Horses.



Selenium Deficiency Map

Selenium Supplement for Horses - Selenium deficiency map



While some parts of the country have high levels of Selenium in their soil and plants, Selenium deficiency has been reported in 46 states. Therefore, most horses require supplementation. Selenium Yeast, the organic form of the mineral, is better absorbed than inorganic Selenium Selenate or Selenite.

Grazing animals in areas with low Selenium levels in the soil are at risk of Selenium deficiency. Selenium deficiency can result in dysfunction of skeletal or cardiac muscles, cystic ovaries, retained fetal membranes, anoestrus, infertility, abortions or stillbirths. Levels of Selenium in a pasture vary throughout the year with lowest levels occurring in the spring and summer. UltraCruz® Equine Selenium Supplement for Horses helps to maintain healthy levels year round.

References:

  1. EFFECT OF SELENIUM SOURCE ON SELENIUM DIGESTIBILITY AND RETENTION IN EXERCISED THOROUGHBREDS  |  J.D. Pagan, P. Karnezos, M.A.P. Kennedy, T. Currier, and K.E. Hoekstra. 1999. Kentucky Equine Research, Inc. 135-140.
  2. Metabolic and hematological profiles in mature horses supplemented with different selenium sources and doses  |  L. Calamari, F. Abeni, G. Bertin. 2010. Journal of Animal Science. Vol 88, Issue 2: 650-659.
  3. Effect of nutritional antioxidant supplementation on systemic and pulmonary antioxidant status, airway inflammation and lung function in heaves-affected horses  |  N. KIRSCHVINK, L. FIÉVEZ, V. BOUGNET, T. ART, G. DEGAND, N. SMITH, D. MARLIN, C. ROBERTS, P. HARRIS, P. LEKEUX. 2010. Equine Veterinary Journal BEVA. Vol 34, Issue 7: 705-712.
  4. Antioxidant supplementation and pulmonary function at rest and exercise  |  C. M. DEATON, D. J. MARLIN, C. A. ROBERTS, N. SMITH, P. A. HARRIS, F. J. KELLY, R. C. SCHROTER. 2010. Equine Veterinary Journal BEVA. Vol 34, S34: 58-65.
  5. Measures of antioxidant status of the horse in response to selenium depletion and repletion  |  M. Brummer, S. Hayes, K. A. Dawson, L. M. Lawrence. 2013. Journal of Animal Science. Volume 91, Issue 5: 2158–2168.
  6. Dietary selenium and prolonged exercise alter gene expression and activity of antioxidant enzymes in equine skeletal muscle  |  S. H. White, S. E. Johnson, J. M. Bobel, L. K. Warren. 2016. Journal of Animal Science. Vol 94, Issue 7: 2867-2878.
  7. Submaximal exercise training, more than dietary selenium supplementation, improves antioxidant status and ameliorates exercise-induced oxidative damage to skeletal muscle in young equine athletes  |  S. H. White, L. K. Warren. 2017. Journal of Animal Science. Vol 95, Issue 2: 657-670.
  8. Influence of Dietary Selenium on the Oxidative Stress in Horses  |  Erick Bahena Culhuac, Mona M. M. Y. Elghandour, Moyosore J. Adegbeye, Alberto Barbabosa-Pliego & Abdelfattah Z. M. Salem. 2022. Biological Trace Element Research.

Pellet vs. Powder Supplement Formulations

UltraCruz® Supplements are now available in pelletized formulations. By using pellets, rather than powder, we have been able to:

Selenium Supplement for Horses - Piles of Equine Supplement pellets
  • Ensure stability of active ingredients
  • Maximize product freshness
  • Reduce waste

All San Juan Ranch performance and breeding horses use UltraCruz® Equine pelletized products.

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Is your selenium supplement organic?

Asked by: Melanie
We use organically chelated selenium yeast in our Ultra Equine Selenium Supplement for Horses. Thank you, SCAH Team
Answered by: Mandy
Date published: 2023-11-16

How much seleniomethionine is in a scoop of your selenium for horses? Thank you

Asked by: MJSpears
The ingredient for this product is as follows: Pellet: Selenium (min): 42 ppm Ingredients: Dehydrated Alfalfa Meal, Ground Flax Seed, Rice Bran, Soybean oil, Selenium, Lignin Sulfonate. Powder: Selenium: 2,000 ppm Inactive Ingredients: None. Thank you, SCAH
Answered by: Mandy
Date published: 2023-09-28

I can't find where you list the amount of selenium in your product

Asked by: Carol
Hello! Active Ingredients (Pellet): Per recommended daily dosage (2 scoops; 56 g): Selenium: 2.4 mg
Answered by: SCAH Rep
Date published: 2020-04-08

How many mg of selenium per scoop in the pellets?

Asked by: Sandra
Hello! There would be 1.2 mg of selenium per scoop. We recommend giving 2 scoops a day so that the total daily dosage is 2.4 mg.
Answered by: SCAH Rep
Date published: 2022-11-18

How much of the powder gives 2 mg se yeast?

Asked by: Joyce
Hello! 2 scoops give about 2.4mg of Selenium. 1 2/3 scoop would give about 2.0 mg.
Answered by: SCAH Rep
Date published: 2019-12-17

is this organic?? My vet says that if not they do not absorb??

Asked by: Ivygirl
So what is organically chelated selenium in this??
Answered by: ivygirl
Date published: 2018-08-21

Hi, I lost my scoop. What teaspoon measurement would give 5 mg of selenium? Thank you

Asked by: Laura
Hello there! 5 mg will convert to .001 teaspoons. If you'd like, we can also send you another scoop! Please contact customer services at [email protected] if you'd like another scoop!
Answered by: SCAH Rep
Date published: 2022-09-29

Selenium isn't well absorbed without Vitamin E...is there a reason it isn't in this product?

Asked by: Kingery007
Hi, thank you for the question! This supplement is pure Selenium because in many cases a horse may already be getting enough Vitamin E in their regular diet. If you are looking for a supplement that includes both Vitamin E and Selenium, please see UltraCruz Equine Antioxidant Formula or UltraCruz Equine Liqui-Sel.
Answered by: SCAH Rep
Date published: 2017-09-01
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Rated 5 out of 5 by from Great serviceIt's hard for me to review the actual product since I'm not the one eating it, but I can comment on the great service! The selenium powder shipped the same day I ordered it and was here within a few days, which is saying a lot during these times. A couple other companies I ordered things from took weeks to arrive. There were also two free samples of other products in the package as well. Nice surprise! The selenium powder has a very fine texture and a strong smell, but I feed such a small amount of it and it's mixed with several other mineral powders and pellets so I'm not sure if my horse even notices it.
Date published: 2020-07-17
Rated 5 out of 5 by from Simple, reasonably priced & horses eat itI live in an area with low levels of selenium in our soils so my horses need a Se supplement. The horses eat it just fine mixed in with their other supplements, several of which are also UltraCruz products. I feed the pellets so can’t speak to the powder but I like that the pellets provide 1.2 mg of Se per scoop so I can easily adjust depending on what else the horses are getting. Some of my horses need more, some need less. Overall, I am happy with this product and really like that it doesn’t have any added iron, which seems almost impossible to find in horse supplements. I live in an area with high levels of iron in the soil so I never want to add any extra iron to their diet.
Date published: 2022-12-30
Rated 5 out of 5 by from Great priceJust ordered the pelleted selenium yeast to use in conjunction with the UltraCruz natural vitamin E. The price is totally affordable and makes it easy to feed with the vitamin E at the levels I need. I don't usually like feeding 2 in 1 supplements so I love that buying both is fast, easy and affordable. Also love the pellet vs powder option. I usually buy powder because I feel that it is more easily absorbed but I chose the pellets for the selenium yeast because I have a couple of picky eaters.
Date published: 2018-01-19
Rated 5 out of 5 by from Great product!My older dressage horse has been on the UltraCruz supplements for about 6 months now, and I have seen great results! In combination with quality hay and grain, this supplement helps to complete his diet. I so appreciate the ability to buy a single ingredient, as he does not need other additives! Love this!
Date published: 2018-12-13
Rated 5 out of 5 by from Pelleted formulation is so easy to feed!This Selenium pelleted formula is just what I needed for my Warmblood gelding, who leaves behind any powdered supplements! He has a high need for Selenium and Vitamin E so I have to make sure he gets both of these daily. And you cant beat the great pricing on this Selenium product!
Date published: 2019-02-16
Rated 5 out of 5 by from It really works and my horse eats it up!I was struggling to get my horse's selenium levels up to the normal range. My vet suggested that I try feeding selenium yeast for best results. I bought two previous brands and I could not get him to eat it. I bought the ultra cruz selenium pellets and he eats themright up. And the best news is that we just had blood test done and he is finally in the normal range. I plan to keep him on this product for the rest of his life.
Date published: 2020-03-17
Rated 4 out of 5 by from Good and cost efficientI live in a low selenium region and have had issues with my horse being deficient. Even though I've been supplementing ever since, when I had him (and another horse that I later purchased) tested, they were both low. Most selenium supplements also come with added vitamin e, but since my first horse is already supplemented with high doses of liquide vitamin e and since he and my new are on grass almost 24/7 during the summer paying for a Vit E + Selenium supplement didn't make sense. This supplement fits the bill! It's only selenium and the amount needed is tiny. It's a very cost efficient way to get them what they need. I haven't tested their blood levels yet, so I can't speak to that at this time. Only con is the consistency of the powder is not the best and the smell is slightly disagreeable. But both my TBs have been eating it without issues and you can't beat the price!
Date published: 2019-07-29
Rated 5 out of 5 by from Quality supplementI have been feeding my OTTB the selenium pellet in combination with Vit E and C for a specific health issue. His overall health has greatly improved as has his health problem! I will continue to use UltraCruz supplements for my horse and highly recommend them to others. Please note! Do not overfeed Selenium as it can be toxic. Always follow feed instructions. Call vet immediately if toxicity is suspected
Date published: 2024-03-18
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Selenium Supplement for Horses – UltraCruz is rated 5.0 out of 5 by 85.
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