Everyone’s stomach and digestive process is unique.  What bothers one person to the point of staying home is perfectly gentile to others.  This is true for many medications as well as a most food products.

Resveratrol is suggested to be taken on an empty stomach in between breakfast an lunch for maximum absorption rates.  If you are used to packing on bacon & hashbrowns for breakfast, there is a chance some grease still lingers around and, when mixed, will cause some stomach issues.

You know your body’s tolerances better than anyone else (likely including your doctor).  If resveratrol causes uneasiness in your stomach, change your regime around until you find a schedule for taking your supplement that fits you.

So, to answer the questions “does resveratrol cause diarrhea?” my answer would have to be … maybe :]