Store bought pumpkin pie spice does loose its strong aromas quickly. I have noticed that I should use it up within a month of buying it. Those companies that store it in glass bottles will have a longer shelf life. The one sold in plastic bottles loose their potency very quickly, in my experience My homemade version lasts about 2 months, if I store it in a glass jar with an air-tight container. This pumpkin pie spice is vegan friendly, so, use it in all your vegan desserts. I wrote up a nifty guide to what is vegan and what is not vegan.