I give my 7 yr old son sambucus(elderberry) from the health store for coughs. is this a good practice?

Sambucus: You should not give your child anything from health food store without consulting your pediatrician. Although sambucus has been used by many for a remedy for cold, cough amd flu, we dont know the dose for a seven year old child and what long term side effects it may have. All the studies done have been done outside of us and by the companies who produce and market this product.