Glycerin is accessible to the human body when added to food in doses at room temperature. Glycerol is currently used in large quantities in the food, personal care and pharmaceutical industries, among others. In these applications, it is basically added in doses at room temperature, when compounds harmful to the human body are not produced because the polyol, glycerol, has not reached its boiling point and pyrolysis temperature. If the boiling point of glycerol, 290°C, is exceeded during processing and end-product use, a large number of toxic gases that pose a threat to human health will be produced, including formaldehyde, acetaldehyde, acrolein, crotonaldehyde and other toxic gases. In the presence of alkali and salt, carcinogenic tar will also be produced. Glycerol is added to some sports drinks, etc. The content is relatively small, and it is consumed at room temperature, which does not involve the pyrolysis of glycerol, so it can be regarded as non-toxic to the human body. To summarize, although glycerol is listed in the national standard GB2760-2011 for food additives and can enter the human body, it must comply with the permitted scope of use and the use of dosage, otherwise it will bring harm to the human body.