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April 29, 2014


Lysine is commonly lacking in a horse’s diet.

by DePaolo Equine Concepts

What is L-Lysine?

L-Lysine is an amino acid. Amino acids are the building block of protein. L-Lysine is important in metabolism, a healthy nervous system and proper immune function. A well functioning immune system can prevent disease and boost overall health.

Amino Acids are the “building blocks” of proteins

Protein forms the skin and hair coat, builds muscle and strengthens bones and ligaments. To help assimilate protein a horse needs a proper balance of amino acids in their system. Amino acids are obtained through food but unfortunately most grass and grain are low in amino acids, Lysine in particular.

Which horses are most affected by Lysine deficiencies?

Really all horses are affected by Lysine deficiencies unless they are being properly supplemented. Lactating mares, growing foals, breeding stallions and performance horses under high stress are most likely suffering from a Lysine deficiency. They may not reach optimum growth or recover as quickly from injury as well as having a compromised immune system, which leads them to be more susceptible to disease and sickness.

L-Lysine and Equine Rhinopneumonitis (EHV-1 & EHV-4)

One of the most common diseases of the modern day horse is a disease called Equine Rhinopneumonitis (EHV-1 & EHV-4), which is caused by a herpes virus. Rhino is the inflammation of the respiratory tract somewhere between the nose and the lungs. Horses are typically infected at a young age (between 2-4 years), usually during their first respiratory tract infection.

Since Rhino is caused by a herpes virus, it lives in the horses body and cannot be cured.  Outbreaks may also occur during times of high stress to the immune system (i.e. training, hauling, shows, other disease/infections, ulcers etc.). Supplementing the immune system with Lysine can be very beneficial to optimal health and performance.

How much L-Lysine should my horse have?

The National Research Council estimates that the daily Lysine needs of mature 1,100 pound horses range from 29 grams for horses doing light work to 46 grams for mature horses in intense work. Grains and grasses are considered inadequate sources of Lysine. DePaolo Equine Concept’s L-Lysine is a pure way to supplement correctly for Lysine deficiencies in horses.

2 Comments Post a comment
  1. carol Young
    Jan 24 2015

    What supplement would I feed with enough L Lysine

    • We sell granulated L-Lysine in our online store or if you are looking for a complete vitamin & mineral supplement our Essential has more Lysine than any other on the market but it still is not enough for some horses under a lot of stress. You can purchase both at


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