Lotus leaf extract, also known as nuciferine, is prepared by pretreating dried and crushed lotus leaves with cellulase, extracting with dilute hydrochloric acid, ultrasonic-assisted extraction, combining extractive solutions, alkalizing to adjust PH value, concentrating evaporated water until the specific gravity is D= 1. 15, extracting, cooling, stirring with chloroform 10 times, standing, layering and extracting with water for three times. Is it hard to understand? To put it simply, lotus leaf alkaloids are helpful to lose weight as you said, so big brands including Nvyuan brand slimming tea have adopted them to varying degrees.