Studies show that expired drugs may lose some of their potency over time, from as little as 5% or less to 50% or more (though usually much less than the latter). Even 10 years after the "expiration date," most drugs have a good deal of their original potency. If your life does not depend on an expired drug - such as that for headache, hay fever, or menstrual cramps - take it and see what happens. One of the largest studies ever conducted that supports the above points about "expired drug" labeling was done by the U.S. military 15 years ago, according to a feature story in the Wall Street Journal (March 29, 2000), reported by Laurie P. Cohen. Here are a couple of resources as well: https://www.health.harvard.edu/fhg/updates/update1103a.shtml http://www.baliadvertiser.biz/articles/paradise/2006/expired_drugs.html
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I don't recommend to use expired natural products. They have a long term valability so when they expired is not indicated to use them anymore. The effects may be unpredictable..
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