Allergies to a specific plant or plant family i.e.: (Solanaceae family; tomato, potato, ashwagandha root) are possible. Be sure to educate yourself before taking an herb for the first time. Start with a small dose, 1-2 drops of a liquid extract in an ounce of water. If nothing happens, proceed over the next few days, increasing the dosage by a few drops. If any reaction occurs, discontinue use and contact an herbalist or your local health care provider.