Only the highest quality ingredients go into every bottle of our nicotine bases- we use one of the purest nicotine available worldwide and dilute it with top quality, highest purity pharmaceutical propylene glycol (PG) and vegetable glycerin (VG). The low nicotine content nicotine bases with nicotine content of 18mg/ml* are ready to vape. Unflavored nicotine bases - simply add flavoring of your choice to receive a ready to vape e-liquid. Ease of use makes them ideal for DIYers who have no prior experience working with nicotine or high content nicotine bases and are not sure if they will handle the safety issues.