It is smaller than a fish oil capsule but neither of us (husband and myself) are taking any kind of vitamins now. I punctured it and tasted it and it was very bitter. I would like to know if my husband may be taking some kind of drug. It would explain some of his behavior lately. I thought it may be a THC capsule or what we used to call an Oiler. It has no markings and I do not believe it is a prescription drug.