I have always been curious about the non pheromone components in the bottle since I need to know what in it before doing some more advanced mixing 
. I did a search but nothing came up, so I used the label on bottles, did a small research and put together a summary for anyone who would like to know more.
SD-38, SD40: abbreviation for “specially denatured”. It is ethyl alcohol or ethanole derived somehow for a specific purpose. Here would be to get a better solubility. It is completely approved and safe for cosmetics. But it can be toxic if ingested at huge dose, watch out all you phero-eaters 
.
denatonium benzoate: included in the SD alcohol. It is one of the bitterest, but untoxic substance availible one earth 
. It can be tasted at very diluted amount. And of course its purpose is to prevent intentional ingestion.
Dipropylene Glycol: Share similar properties with oil and allows slower diffusion than alcohol. It is a little polar, and can be mixed more easily than oil with other polar liquid like alcohol and water.
Frangrance: of course present in most bottles!
If you know the proportion of those in the instant products, plz let me know. I am working on a better miscibility experiment to create some good and effective oil product from instant line for slower release. Hope I can succeed and share it with everyone.
j\k but couldn’t resist. Ok got that out of my system - back to seriousness.