There are basically no side effects, but in the case of excessive use, it may cause anorexia, so when choosing such products, you should buy reliable and trustworthy products that do not need long-term consumption. For example, South Korea's original Huijianhao Good Night Plant Sleeping Aid Tablet contains γ -aminobutyric acid, theanine, tryptophan and valerian, which can relieve mental stress. As long as you eat it for 2 weeks, you can obviously improve your sleep and have a good sleep for 28 days. When choosing this kind of products, we must choose standardized production without dependence.