In this post, Why did I buy this again" Cera bellina, CJ asks: Can you tell me the shelf life of Cera bellina" I think it would be several years, but would like to be sure before wasting any ingredients! Also, if it's not too much to ask, can you also tell me the approximate life of liquid crothix, polysorbate 80 and glycerin" I think I'm being told a much too short span by the seller and would like a second opinion! Thanks so much!

There are a lot of factors that go into the shelf life of a product, so it's hard to give a definite answer. In general, we can say that this ingredient should last "x", but that can change based on the environment in which you keep it - cool, dark place versus a bright, sunny window - when your supplier opened their container, and so on. (For the ingredients you list, the latter three are at least two years.)
On top of this, these ingredients could have different shelf lives based on manufacturer. For instance, polysorbate 80 from manufacturer ABC could have a one year shelf life, while manufacturer DEF claims a two year shelf life. Again, ask your supplier for more information.

If you don't believe what the supplier has written on their site, ask them for a copy of the data sheet they receive from the manufacturer, do a search on Google using the INCI name of the ingredient, or read up about the ingredient at a manufacturers' site.

An INCI name is the International Nomenclature for Cosmetic Ingredients name th...