I discovered this Truffle Zest product at the end of 2016; it’s very good. It’s a good way of getting truffle flavor into a dish without adding salt (via truffle salt) or oil (via truffle oil, which is also often rather artificial anyway). Highly recommended for things like pasta and risotto dishes.
So what exactly is in it? Did a quick look and can’t really tell. Truffle oil is nasty. Fresh truffle salt can be tolerable. Some truffle butters for some reason seem to carry it better.