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Last shipping in 2021 will be on 21st December. Please order your supplies soon to avoid running out in the busy period before and after the festive holidays. Click here for full details.

To Support a Healthy Hindgut and Maintain a Healthy Immune System for Horses.

L-LYSINE – Essential Amino Acid. Build topline muscle and boost immunity.



L-lysine (Monohydrochloride). An essential amino acid.

Equine feed supplement for improved protein availability, muscle health, immune support, hoof & skin health and performance.

Lysine is an essential amino acid most often deficient in the diets of horses. Lysine is found in a wide variety of tissues, hormones, and cells throughout the body. Myosin and other muscle proteins contain large amounts of lysine. Proteins that require lysine include the collagens and elastins that make up bone matrix, tendons, skin, and articular cartilage.  Keratin protein in hoof and hair also requires lysine. Inadequate intake of protein or required amino acids by horses may lead to reduced feed intake, body tissue loss, poor coat, and  hoof growth. It can also contribute to decreased growth and development in young animals.

Using  Progressive Earth L-lysine at times of stress is key to calcium absorption, boosting the immune system and supporting the body’s production of hormones, enzymes and antibodies.

L-lysine is commonly considered a useful nutritional supplement for Herpes virus outbreaks in people. A common disease of the modern day horse is Equine Rhinopneumonitis (EHV-1 and EHV-4), which is caused by a Herpes Virus. Rhino is the inflammation of the respiratory tract caused by the Herpes virus that lives in the horses body and can not be cured. Highly stressful situations such as training, travelling, shows, other diseases or infections and ulcers for example, can cause an outbreak to occur.

Supplementing the immune system with L-lysine can be very beneficial to optimal health and performance.


  • Improve protein availability.
  • Balance a lysine deficiency in forage/diet.
  • To build topline/muscle mass, aid collagen formation and tissue repair.
  • For horses lacking stamina.
  • Improve hoof growth and quality.
  • Horses with Equine Rhinopneumonitis (EHV-1 and EHV-4).
  • Boost the immune system, support a healthy nervous system and promote overall health.

Pack size and availability: Progressive Earth Ltd  L-lysine equine feed supplement is available in resealable grip seal pouches which contain either 1 Kg, 2 Kg or 4 Kg of product.

Multiple purchase options are available.

6 reviews for L-LYSINE – Essential Amino Acid. Build topline muscle and boost immunity.

  1. Helen L.

    Excellent service and great product

  2. Shona Gough

    Good quality supplements excellent delivery

  3. Ella Livingstone

    Good price, seems high quality

  4. Dianne

    Always a prompt service. Highly recommended

  5. Carol

    Excellent thank you

  6. Ella Livingstone

    Good price and seems great quality

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