Date published: 2026-7-29

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Lysine for Horses – UltraCruz®

by Santa Cruz Animal Health
4.9(56)
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Horse supplement containing lysine to regulate protein levels especially for horses with a grass-based diet
    • Essential amino acid supplement to support growth and development
    • Helps promote healthy hair, hooves, and muscle development
    • Ideal for weaned foals, broodmares, performance horses, and horses with a grass-based diet
    • Provides Lysine as an easy to use pellet; also available in 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 in-stock items ordered before 3:00 PM Central Time Monday-Friday.
    • DISCOUNT: Bulk orders of UltraCruz® Animal Health products totaling $500 or more receive a 5% discount.
Catalog #DescriptionPriceQtyAutoshipCARTFAVORITES
sc-516460
10 lb, pellet, 80 day supply
$22.95Autoship: $21.80
sc-516461
25 lb, pellet, 200 day supply
$47.95Autoship: $45.55
sc-363252
4 lb, powder, 360 day supply
$39.95Autoship: $37.95
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UltraCruz® Equine Lysine Supplement for Horses

  • Essential amino acid
  • Can help improve protein availability
  • Can promote healthy growth and development
  • May help support muscle mass

UltraCruz® Equine Lysine Supplement for Horses is a formula that helps to improve the quality and availability of protein in the diet, so it can be utilized more efficiently, and is recommended for equine diets low in alfalfa, clover and soy. Utilization of protein in the diet is one of the keys to efficient growth and muscle development. This amino acid supplement for horses provides pure Lysine as an easy to use, palatable pellet.

Lysine for Horses - CD Diamond Foal

Lysine is an essential amino acid found in a wide variety of tissues, hormones, and cells throughout the body. Proteins that require Lysine include the collagens and elastins that make up bone matrix, tendons, skin, and articular cartilage. Keratin protein in hooves and hair also requires lysine. As an essential amino acid often lacking from an equine diet, Lysine supplementation has been shown to support healthy growth.

References:

  1. Growth of thoroughbreds fed a low-protein supplement fortified with lysine and threonine.  |  Staniar, WB., et al. 2001. J Anim Sci. 79: 2143-51. PMID: 11518223
  2. Amino acid supplementation improves muscle mass in aged and young horses.  |  Graham-Thiers, PM. and Kronfeld, DS. 2005. J Anim Sci. 83: 2783-8. PMID: 16282616
  3. Characterization of L-lysine transport across equine and porcine jejunal and colonic brush border membrane.  |  Woodward, AD., et al. 2012. J Anim Sci. 90: 853-62. PMID: 22064742
  4. Lysine supplementation of diets for yearling horses.  |  Ott, EA., et al. 1981. J Anim Sci. 53: 1496-503. PMID: 6804430
  5. Influence of Protein Level and Quality on the Growth and Development of Yearling Foals  |  E. A. Ott, R. L. Asquith, J. P. Feaster, F. G. Martin. 1979. Journal of Animal Science. Vol. 49, Issue 3: 620-628.
  6. Influence of quality of dietary protein supplement and anabolic steroids on muscular and skeletal growth of foals  |  M. T. Saastamoinen and E. Koskinen. 1993. Animal Science. Vol 56, Issue 1: 135-144.
  7. Protein, amino acid and energy requirements of weanling foals and yearlings  |  Markku Saastamoinen. 1996. Agncultural Research Centr. Vol 12, Issue 3: 297-302.
  8. Growth of Thoroughbreds fed Different Levels of Protein and Supplemented with Lysine and Threonine  |  Staniar, William Burton. 1998. Virginia Tech, Masters Thesis.
  9. Protein status of exercising Arabian horses fed diets containing 14% or 7.5% crude protein fortified with lysine and threonine  |  P.M. Graham-Thiers, D.S. Kronfeld, K.A.Kline, D.J. Sklan, P.A.Harris. 2000. Journal of Equine Veterinary Science. Vol 20, issue 8: 516-521.
  10. Influence of Energy and Protein Content of the Concentrate and Restricting Concentrate Intake on Growth and Development of Weanling Horses  |  E.A.Ott, PASJ.Kivipelto. 2002. The Professional Animal Scientist. Vol 18, Issue 4: 302-311.

Pellet vs. Powder Supplement Formulations

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

Lysine 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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