I was wondering if someone could share their experience with Grape seed extract or Schizandra ? If anyone has had any side effects from it ? I have had fatigue for a while now and the doctors haven't been able to figure out the reason for it except for my Vit D is low. I am taking 1000 IU of vitamin D3 daily. I have been taking Grape seed extract and also Schizandra to help with the fagitue. However, since the last few months I have been getting dizzy and sleepy right after I eat lunch. Could any of these be causing hypoglycemia in me ?