Enzymes are made by fermenting vegetables, fruits, mushrooms, cereals and other plants as raw materials. Eating enzymes may cause side effects such as food poisoning and allergies. Some studies have concluded that eating enzymes in moderation has some health benefits. Enzyme is a fermented liquid containing polysaccharides, probiotics, enzymes and other biologically active substances, and eating it in moderation can promote gastrointestinal peristalsis and assist in regulating intestinal flora. However, improper consumption of enzymes is prone to the following problems. 1. The production of enzymes is a natural fermentation process, during which various kinds of harmful bacteria and harmful substances can easily grow. Eating it can lead to food poisoning. 2. After fermentation, the raw materials of enzymes will decompose and produce various new ingredients, for example, pectin will produce methanol after fermentation, which is harmful to human health. 3. The complexity of the ingredients and active substances in enzymes can easily lead to allergic symptoms such as rashes, itching, nausea, vomiting and abdominal pain. Usually, the above problems are prone to occur in people who consume homemade enzymes. It is recommended that people who have the need to take enzymes should avoid consuming homemade enzymes, consult their doctors, and choose enzymes sold through regular channels.