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They in and of themselves are not preservatives, in the sense that you just add some to any formula and it will work to preserve it. But many do have the effect of preserving a formula which is why some preservatives are made from them, or contain them. Here's some for your research; look into...

I think you might be confusing something like Vitamin oils with essential oils. Essential oils are the basis for quite a few preservatives. BG

It completely depends on the formula. What is the pH? How much glycerin is in the formula? Does the formula have other ingredients such as essential oils that might make the formula self-preserving? Glycerin works to preserve products as do some essential oils.

Rubbing alcohol contains chemicals added so that it smells so terrible no one would be able to drink it. You probably do not want your lotion to smell like that, which is why it should never be used, not because it would not work. Alcohol is regularly used in patient preoperative skin...