Magnesium may help prevent migraines by influencing neurotransmitter release and blood vessel constriction. Studies suggest it may help reduce frequency and severity, making it a potential preventive measure for those prone to migraines.Magnesium may help prevent migraines by influencing neurotransmitter release and blood vessel constriction. Studies suggest it may help reduce frequency and severity, making it a potential preventive measure for those prone to migraines.