Cal-XTRA is formulated as a critical supplement for horses grazing in regions with oxalate-containing grasses, commonly in Queensland, The Northern Territory and parts of New South Wales and Victoria.

Tropical and sub-tropical grass, particularly setaria, para, buffel, teff, pangola, kikuya, couch grass and green panic, contain oxalates which bind up and reduce the absorption of calcium, resulting in calcium deficiency which can lead to bone weakness.

Cal-XTRA is a concentrated source of bone minerals, especially calcium, to ensure extra supply and help prevent bone demineralisation that would otherwise lead to lameness, osteoporosis and Big Head.

Horses on high grain diets also benefit from the calcium and other nutrients supplied by Cal-XTRA to help bone strength and soundness during moderate to intense training.