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It won't poison you, but it may degrade in strength so that you don't get as much vanilla flavor out of the same amount of flavoring. Eventually it will begin to taste stale. By placing an expiration date on it, the manufacturers protects themselves from consumers complaining that it doesn't taste right. e.g. if it's 25 years old, of COURSE it doesn't taste right - it's way past the "expiration date."

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8y ago

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