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I have some that's exactly 4 yrs old. It just loses its potency and wont work well, you'll have to take more. It may also not be that good for you. You can usually tell its state but not potency by its smell and color. If they look old and smell weird or bad, its iffy. The Bottle should have been closed the whole time and the pills should be clean. So yes you can, I do. They just don't work.

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13y ago

What else can I help you with?