Nutraceutical-drug interactions

As nutraceuticals are not classified as medicinal products, their manufacture is often not legally regulated. Nutraceuticals are widely available for sale, and the many suppliers may formulate their products differently this leads to variations between products of different manufacturers. Products available for purchase are not necessarily of the same quality as those used in reported clinical trials. For effective and safe use, the products must contain the same active ingredient, at the same concentration, have known bioavailability per delivery system, and state detailed and correct information on packaging or patient leaflet. However, possibly due to purchase from non-pharmaceutical sources such as the Internet, there is often little information on efficacy, drug interactions, effect of long-term use, abrupt discontinuation, or potential adverse effects available to patients. 

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