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Limestone Flour should be used if your horse needs calcium adding into his everyday diet. It may be that he has certain bone growth problems, or just a general calcium deficiency, either way, Calcium is an essential part of the diet, because of the huge amount of benefits it has. Not only does it help bones stay strong and healthy, but it is also great for keeping muscles, such as the heart, contracting correctly. This supplement is also really useful for lactating mares with foals, who need a little extra support with their milk production. Limestone Flour from NAF is basically pure calcium, because of the fact that it contains only ground up limestone, with nothing else added. However NAF do recommend that Limestone flour should not be given to youngstock, as excess calcium in their system can lead to developmental abnormalities.