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M.A.S.S. Builder (MultiActive Strengthening) For Horses

Pet Size

Don't know your pet's weight?

If you can't get them on the scale, try this super simple method:

  1. Weigh yourself.
  2. Weigh yourself holding your pet.
  3. Subtract the two numbers to get their weight.

Too heavy to hold? Your vet will weigh them if you ask (or may already have it on file if you call).


No Prescription Required

  • Description

    M.A.S.S. Builder is a unique system that combines proven ingredients to boost muscle strength and maintain a healthy appetite in horses. With elevated concentrations of natural rice bran extract, it fosters muscle growth and conditioning, complemented by essential amino acids that optimize weight, feed efficiency, and growth. Additionally, it features fenugreek, a natural appetite enhancer, to bolster the horse's natural endocrine system production and balance.

    Before you buy M.A.S.S. Builder for horses, it is important that you talk to your veterinarian about its effectiveness and potential side effects.


    Administer one scoop of M.A.S.S. Builder per day for horses up to 1,000 pounds. For larger horses, increase the dosage to two scoops per day. Mix the appropriate dosage of this weight gain supplement for horses into their regular feed. Ensure thorough mixing to prevent any residue. It is recommended to use M.A.S.S. Builder continuously, even during periods of rest or reduced activity.


    Every ounce contains 2,000 milligrams of l-lysine, 1,500 milligrams of gamma oryzanol, 1,000 milligrams of threonine, and 20 milligrams of fenugreek.


    Before introducing any new supplement into your horse's diet, consult with your veterinarian.

    Check the ingredient list for any known allergens that your horse may be sensitive to.

    Overuse or misuse of amino acid supplements for horses can have adverse effects on their health.

    If your horse has any underlying health conditions, especially liver or kidney disorders, it's crucial to discuss the use of M.A.S.S. Builder with your veterinarian, as some ingredients may affect these conditions.


    M.A.S.S. Builder is a versatile equine supplement, but it's essential to be aware of potential interactions with other medications or supplements your horse may be taking. Here are some common considerations: Blood Thinners, Anti-Inflammatory Drugs, Probiotics, Diuretics and Immunosuppressants.

    Side Effects

    Some common side effects may include:

    Gastrointestinal Upset

    Allergic Reactions

    Increased Thirst

    Altered Stool

    Increased Energy

    Product Code : 13479

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