This document provides an overview of several topics related to nutritional supplementation in primary care. It discusses 1) how preconceptional vitamins with folic acid for 1 year can reduce preterm labor by 70%, 2) the importance of Coenzyme Q10 supplementation, especially for those taking statins, 3) the benefits of omega-3 oils, probiotics, digestive enzymes and vitamin D, and 4) limitations of observational studies on the effects of supplements.