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The concept that nutrition underpins the prevention and management of many horse health problems means research into equine nutrition and metabolism is gaining momentum — improving our capacity for early intervention and reducing the incidence of diseases — leading to a longer, happier, healthier partnership for horses and owners.



Most equine diets are unbalanced for magnesium – and vitamin B and E deficiencies are common in cycling, pregnant and lactating mares, foals, fillies and older horses and ponies, during exercise and in horses on hard feed.

Magnesium requirements are increased in veterinary conditions such as insulin resistance (and laminitis), Cushing’s, equine metabolic syndrome and muscle conditions. Vitamin E supports the immune system, enhancing colostral quality and the response to vaccination.

EzyMAG+ provides clinically recommended levels of magnesium and vitamins E, B1 and B6, supporting muscle, nervous and immune function and protecting against dietary deficiencies.

GUARANTEED ANALYSIS (per kg):  Magnesium 360g, Vitamin E 60000iu, Vitamin B6 (pyridoxine hydrochloride) 50g, B1 (thiamine hydrochloride) 80g, salt (sodium chloride) 100g

This product does NOT contain restricted animal material. APVMA#: Exempt
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Bighead and osteoporosis are a constant risk from high phosphorus, oxalates and phytates in feeds such as cereal and grassy hays, grains, bran and sub-tropical grass (including buffel, panic, kikuyu and setaria) found throughout Australia. Signs include shifting intermittent lameness, reluctance to move forward freely, joint pain, ‘creaky’ joints, stiffness, dental problems and an increased risk of fractures, tendon and ligament injuries.

Maintaining mineral intake throughout a horse’s life helps protect against dietary imbalances and musculoskeletal weakness. Only chelated calcium is protected from oxalates and phytates in the feed.

GUARANTEED ANALYSIS (per kg):  Calcium 302g, Manganese 8880mg, Copper 2010mg, Iodine 34mg, Zinc 810mg, Selenium 15.4mg, Methionine 145g, Salt (NaCl) 151g

This product does NOT contain restricted animal material. APVMA#: Exempt
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Bighead, calcium deficiency and osteoporosis are significant problems for horses on sub-tropical grasses - including buffel, panic, kikuyu and setaria.

Oxalates in these grasses bind calcium - making it unavailable to the horse and increasing the risk of a dietary calcium deficiency. Clinical signs of calcium deficiency, osteoporosis and nutritional secondary hyperparathyroidism include intermittent lameness, stiffness, shortened stride, tendon and ligament weakness, dental problems, weight loss and fractures. Lime and other inorganic forms of calcium supplements are also bound by oxalates – only chelated calcium is safe from oxalates.

GUARANTEED ANALYSIS (per kg):  Calcium 176g, Manganese 1940mg, Copper 1014mg, Iodine 17mg, Zinc 1814mg, Selenium 3.3mg, Methionine 90g, Salt (NaCl) 300g

This product does NOT contain restricted animal material. APVMA#: Exempt
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I have known Dr Stewart for two decades. I have the highest level of respect for her knowledge, integrity and desire to help horses. Her products are of the highest quality.
— Dr Oliver Liyou BVSc (Hons1) MACVSc (Eq Dent)

Bighead and osteoporosis occurs in horses on pasture or stabled, and at any age.

 It can happen on grain, bran and pasture diets — especially buffel, pangola, setaria, kikuyu, green panic and signal grass. These grasses contain oxalates that bind to the calcium in the grass, hard feed and supplements — making the diet calcium deficient and unbalancing the calcium:phosphorus ratio.

The importance of calcium

Calcium is essential for life itself (regulating heartbeat, nerve function, muscle contraction and blood clotting) and blood levels are tightly regulated by parathyroid hormone (PTH). PTH is released when diets are low in calcium — causing calcium to move out of the bones and into the blood, and leading to demineralisation of bones and osteoporosis. Mild cases are difficult to detect, manifesting as vague shifting lameness, shortened stride, soreness at ligament and tendon insertions, joint pain and swelling. In more severe forms, ligament and tendon injuries increase and there may be a watery nasal discharge, poor coat, difficulty chewing, dental pain and swelling of the jaws, maxilla, mandible and nasal bones.

Management and prevention

The dietary calcium deficiency must be corrected. Chelation protects calcium from oxalate attack, is over 95% absorbed into the blood stream and, in the presence of oxalates, is more bioavailable than inorganic forms (lime and dicalcium phosphate). Dr Jennifer Stewart’s Bone Formula® Forte and Calsorb® Forte  contain chelated calcium PLUS essential bone trace minerals that are deficient in Australian soils, pastures, hays and grains.


The need to provide mineral supplements for horses is well recognised. The challenge is to provide minerals which are both highly absorbable and bioavailable. The solution is mineral chelation.

Introducing chelated calcium from Dr Jennifer Stewart
In many grasses, calcium is bound to oxalates. Calcium-oxalate is insoluble in the gut and the calcium is unavailable. Other minerals are also bound to oxalates but are soluble in the gut – releasing the oxalates, which then bind to calcium in hard feed and supplements – making them unavailable. The calcium in the grass, hard feed and supplements cannot be absorbed and pass out in the manure.

To address the problems of calcium-deficient feeds and diets, Dr Jennifer Stewart’s Bone Formula® Forte and Calsorb® Forte  are formulated with organic chelated calcium which is protected from oxalate binding.