Vitamin D is important both in its own right and as helping the absorption of calcium. Anticonvulsant drugs interfere with vitamin D and calcium metabolism in some manner not well understood.*

Vitamin D is found in most oily fish and some animal products, especially in cheese and fortified milks. It is important to expose your child to sunlight (about half an hour daily) as it is an excellent source of vitamin D. In one study, supplementing the diet of twenty-three people with epilepsy with vitamin D resulted in a significant decrease in the number of seizures, indicating a possible theraputic effect.**

*Flodin, N. W. (1988) Pharmacology of Micronutrients. New York: Alan R. Liss.
** Christiansen, C. (1974) "Anticonvulsant Action of Vitamin D," British Medical Journal (ii), 2589.