Preparation of decoction: one tablespoon of echinacea in 200 ml of cold water. Bring to a boil and keep for 5 minutes, then remove from heat and let steep for another 10 minutes. Contraindications: Echinacea preparations are generally considered safe, so when used at therapeutic doses, no side or undesirable effects are reported. Avoid in case of allergy to Asteraceae. Avoid use for long periods (at high doses and for a period of more than 8 weeks it can cause hepatotoxicity); it is a good idea to take breaks from intake so as not to overstimulate the immune system. Avoid in cases of liver failure. Contraindicated use in autoimmune diseases such as lupus, multiple sclerosis, AIDS, etc.