The FDA’s proposed deeming regulations call for testing of harmful and potentially harmful constituents in electronic cigarettes. Those requirements would not be triggered until three years after the regulations become effective, and in the meantime the FDA presumably would need to establish protocols for e-cigarette testing and a list of constituents to be reported.
In the meantime, it is prudent business practice to test your products so that you know what is in them and to ensure basic quality. Our friends at Microbac offer this service. Microbac will certify the amount of the key components nicotine, propylene glycol (PG) and glycerol (GLY) in e-liquid products for direct product comparisons. Limit testing for unwanted contaminants ethylene glycol (EG) and diethylene glycol (DEG) further builds a case for confidence through assurance of product integrity.
For more information, see Microbac_E-Liquid_testing