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The first thing that you will notice is the high price. The products are pricey, but they certainly don't hurt. The high price is a good thing because many people want them because they are popular and are cheap to make. Many of the products are in a "drip and spray" fashion, which is why they are so expensive. The product does not have to be made in a sterile environment, but you must wash the container after each use to remove any bacteria. The products are a bit thicker than a regular spray bottle, and may not be water soluble. Some of the products are also called anointment and powder, which are also not sterile. I don't know why they chose to market them as sterile, or how they know if it is, but I have read many people say it is safe to use. In addition to the sterile nature, the products are extremely expensive.