Date published: 2025-10-21
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Horse Antioxidant Formula product group 383566
UltraCruz® Equine Antioxidant Formula supports equine health with a powerful blend of antioxidants. Designed to protect horses from oxidative stress and support well-being.
UltraCruz® Equine Antioxidant Formula supports equine health with a powerful blend of antioxidants. Designed to protect horses from oxidative stress and support well-being.

Horse Antioxidant Supplement – UltraCruz®

by Santa Cruz Animal Health
4.9(22)
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Horse supplement containing antioxidants to help regulate free radicals and promote cell health
    • Contains Selenium, Vitamin C, and Natural Vitamin E
    • Includes ingredients to help provide antioxidants which help remove damaging free radicals and decrease oxidative damage
    • Intended for performance and working horses
    • Can be beneficial for horses turned out on pastures
    • Easy to use pelleted product, which helps reduce waste associated with supplements in 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-516450
4 lb, pellet, 32 day supply
$39.95Autoship: $37.95
sc-516451
10 lb, pellet, 80 day supply
$94.95Autoship: $90.20
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US: Free shipping within the contiguous US on orders over $75. Alaska and Hawaii, please contact Customer Care for shipping fees.
Outside of US: Shipping fee $20 USD. Free shipping on orders over $100 USD.

UltraCruz® Equine Antioxidant Supplement for Horses

  • Contains Selenium, Vitamin C & Vitamin E
  • Helps scavenge free radicals
  • Supports cellular health
  • Helps decrease the negative effects of oxidative stress

UltraCruz® Equine Antioxidant Supplement for Horses is a potent Selenium, Vitamin C and Vitamin E powder formulation that supports healthy tissues and organs. Competition horses have a high energy demand in order to perform their events, and their muscle cells require a large amount of antioxidants.

Selenium and Vitamin E are key antioxidants that work well together to help regulate free radicals produced during exercise. While Selenium is active within the cell, Vitamin E (d-alpha-Tocopherol Acetate), acts within the cell membrane. Selenium also supports a healthy immune system while providing the horse with necessary muscle and joint support. Vitamin E, a fat-soluble vitamin, has been implicated as a cofactor in glucose production and supports a healthy immune system.

Horse Antioxidant Supplement - Teddy Robinson Riding Shiners Diamond Girl

Vitamin C is an antioxidant that works with Vitamin E to protect the tissues of the body, especially those of the respiratory system. Vitamin C also supports production of connective tissues like tendons and ligaments as well as skin, hooves, bones and teeth.

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.

References:

  1. Antioxidant supplementation and pulmonary function at rest and exercise.  |  Deaton, CM., et al. 2002. Equine Vet J Suppl. 58-65. PMID: 12405660
  2. Effect of nutritional antioxidant supplementation on systemic and pulmonary antioxidant status, airway inflammation and lung function in heaves-affected horses.  |  Kirschvink, N., et al. 2002. Equine Vet J. 34: 705-12. PMID: 12455842
  3. Antioxidant supplementation and subsequent oxidative stress of horses during an 80-km endurance race.  |  Williams, CA., et al. 2004. J Anim Sci. 82: 588-94. PMID: 14974559
  4. Antioxidant supplementation in horses affected by recurrent airway obstruction.  |  Deaton, CM., et al. 2004. J Nutr. 134: 2065S-2067S. PMID: 15284404
  5. Oral vitamin E supplementation on oxidative stress, vitamin and antioxidant status in intensely exercised horses.  |  Williams, CA. and Carlucci, SA. 2006. Equine Vet J Suppl. 617-21. PMID: 17402493
  6. The oxidant/antioxidant equilibrium in horses.  |  Kirschvink, N., et al. 2008. Vet J. 177: 178-91. PMID: 17897849
  7. Comparison of an Antioxidant Source and Antioxidant Plus BCAA on Athletic Performance and Post Exercise Recovery of Horses.  |  Kent, E., et al. 2023. J Equine Vet Sci. 121: 104200. PMID: 36577471
  8. Oral administration of ascorbic acid to horses  |  D. H. SNOW, S. P. GASH, J. CORNELIUS. 1987. Equine Vetreinary Journal BEVA. Vol 19, Issue 6: 520-523.
  9. Nutritional Management of the equine athlete  |  Rymond J Geor. 2008. Equine Exercise Physiology. 301-314.
  10. Vitamin C in equine nutrition.  |  Mirowski, A. 2016. Życie Weterynaryjne. Vol 91, No 4: 246-247.

Pellet vs. Powder Supplement Formulations

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

Horse Antioxidant Supplement - 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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Can you please tell me exactly how many mg of selenium is contained in a 56g serving of this supplement? I’ve seen conflicting numbers between your site and others that sell you product. Thank you. 

Asked by: mltodd
Thank you for inquiring with Santa Cruz Animal Health. 3ppm of Selenium is approximately 0.186mg of Selenium in a 56 g of finished product (2 scoops).
Answered by: SCAH Rep
Date published: 2023-04-24

Is this natural or synthetic vitamin e in this supplement?

Asked by: Dante621
Hello! The Vitamin E in this supplement is natural
Answered by: SCAH Rep
Date published: 2022-01-25

How much vitamin e is in each serving?

Asked by: Lindzz1122
Hello! The Vitamin E (min) is 3000 IU per daily serving (which would be 2 scoops).
Answered by: SCAH Rep
Date published: 2025-04-06

How much of the pellets per 1000 lb horse do I feed a day 

Asked by: debm
Hi, thanks for the question. The feeding directions for the pellets are as follows: Dosage and Administration: Administer 1 level scoop (28 g) twice daily. Servings based on an average horse weight of 1,000 lbs.
Answered by: SCAHRep
Date published: 2025-04-06

Can you feed two scoops at one feeding instead of one in morning and one in evening?

Asked by: Peppy
Hi there! In order to get the best results we recommend using twice a day. However, you can use once a day if that is what you prefer.
Answered by: SCAH Rep
Date published: 2019-05-07

What type of selenium do you use in the Ultracruz equine antioxidant formula?

Asked by: Cyndi
Hello, thanks for the great question. The selenium in this formula is provided as Selenium Yeast.
Answered by: SCAH Rep
Date published: 2017-09-29
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Rated 5 out of 5 by from Wow!My vet suggested that I put my Filly on this antioxidant due to her new life off the track and spending lots of time in the pasture. I had some blood work done on her and it showed that she could use a little extra care in this department so I went for it. I have to say in a very short amount of time I have noticed a huge difference. She finally shared her coat and her overall demeanor seems far more Healthy and energetic. She is responding very well to the supplement and I see no reason not to keep her on it, but to continue the process thriving horses equals happy owners.
Date published: 2025-06-30
Rated 5 out of 5 by from My Horses Love it!I was looking for a good antioxidant supplement to support my horses immune system. Most of them have too much artificial flavorings and sweeteners in it. Ultra Cruz Equine Antioxidant Formula was perfect. It does not have anything unnecessary in it and my horses love the taste. They have not been on it long enough yet, but it does seem to be helping them. One of my horses had an infection in his foot and since starting him on it, the infection has improved.
Date published: 2020-07-19
Rated 5 out of 5 by from Picky Eater ApprovedMy horse is a very picky eater and he's had no issue eating this supplement. I like that it is in a pelleted form rather than powder because the powder often sinks to the bottom of the feed bucket and doesn't get eaten. I've been feeding separate vitamin E and vitamin C supplements for years, so I was happy to find a supplement that combined the two.
Date published: 2022-09-13
Rated 5 out of 5 by from Antioxidant FormulaI got this for my jumper gelding who has a million allergies so we had to completely re-do his diet. He’s been on this for a couple months now and he looks and feels amazing. He’s somewhat picky and gobbles this up with no issues. Highly recommend this to everyone. I also love how it has quite a bit of Vit. E in it! Cannot go wrong here!
Date published: 2022-07-25
Rated 5 out of 5 by from Antioxidants are the thing!In dairy cattle nutrition we use antioxidants to preserve feed stuffs and bind free radicals during Times of stress. For our horses in training using an antioxidant to keep them on their game is essential! This blend is inexpensive for the value it provides and gives us piece of mind.
Date published: 2017-12-12
Rated 5 out of 5 by from outstanding productMy horse has trouble every winter when he is off grass and on hay. He also refuses to eat if anything is mixed with his grain. He has been on this product for a month. The pelleted formula mixes without his notice and he is making remarkable improvements!
Date published: 2018-03-21
Rated 5 out of 5 by from My vet wanted me to put my horse on a vitaminMy vet wanted me to put my horse on a vitamin E and Selenium supplement, but everything I found was so expensive. So happy I found Santa Cruz's Equine Antioxidant formula. Gives me exactly what I need at a great price point.
Date published: 2015-04-30
Rated 5 out of 5 by from Great productWas looking for a pelletised product my horses would eat. I dont like powders as it settles to the bottom of the feeder. I mix it with their feed and they are it with no issues.
Date published: 2020-10-28
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Horse Antioxidant Supplement – UltraCruz is rated 4.9 out of 5 by 23.
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