You can probably buy it but I strongly suggest you pay attention and buy a name brand vanilla from a well established store. This isn't a 100% way of knowing you're getting the best but it's better than purchasing it from a small store or a vendor.
The "real" vanilla extracts are more expensive and often the "great deal" extracts are poor quality and many contain coumarin "blood thinner and rat poison". It tastes just like vanilla.
I just say: Beware.
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Vanilla comes from orchids and has to be hand pollinated in the morning when the flowers open. Vanilla orchid flowers open in the morning and if they aren't pollinated they die and fall off that night. Oh and Vanilla orchid vine only bloom once a year. Sometimes they skip a year also. How do I know this? I had a Vanilla vine and I tried to grow the beans. I didn't harvest the beans in time so it didn't work for me. I will try again next time it blooms. It didn't bloom last year.
Green Vanilla bean.
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