It should be sterile in the vial. When making my own, I use sesame. I bake it at 400 for 20 minutes, then go through the conversion process. With the initial baking, addition of the BA and BB, and filtering process it's a very sterile end product.
is nothing special - although some folks would have you believe it is. I had an exchange with Bill Roberts about this issue once, and we concluded that Wesson Soybean oil would work well - based on its viscosity, clarity, and low cost. Once you add BA and sterile filter it, it is a good approximation to what you'd get using USP grade Croda safflower oil.
There are differences in the quality and purity of oil depending on the grade.
USP grade Sesame oil is is more pure then sesame oil you could buy in the grocery store.
Both would work just fine and both can be sterilized with no problems, the only concern is some of the additives in cooking oil as compared to a USP grade oil. If you buy oil in the grocery store just try to find oil with the least amount of additives.
Some say there is nothing special. But I can't figure out what all is in Animal's kits. He has a concoction of stuff. I know his is sterile. But if you question these kits, just sterilize it again once you reseave it.