Are homeopathic medicines synthetic?

Homeopathic medicines are prepared from many natural substances such as herbs (Plant kingdom) and minerals (mineral kingdom). Plant Kingdom: Belladonna atropa (Deadly Nightshade) , Calendula Off (Marigold), Arnica Montana (Leopards bane), Crocus Sativa (Meadow saffron) Mineral Kingdom: Sulphur, Calcarea Carb (Calcium Carbonate) , Nitric-Acid, Natrum-Muriaticum (Common Salt)