Giving magnesium and boron can benefit headshaking horses, the findings of research suggest. Trigeminal‐mediated headshaking, which used to be called idiopathic headshaking, is caused by a low threshold of firing of the trigeminal nerve in the face. In most cases, the condition is worse during spring and summer, and geldings are over-represented. Various treatments have been tried, including face masks with ultraviolet light protection, nose nets, nutritional supplements, antihistamines, corticosteroids, neuromodulation, and even surgery on the nerve. Results have been variable.

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