This document provides an overview of vitamins, herbs, and nutritional supplements. It defines key terms like vitamins, herbs, recommended dietary allowances, and dietary reference intakes. It differentiates between vitamins and herbs, as well as macronutrients and micronutrients. The document describes several important vitamins (A, B, C, D, E, K), discusses protein supplementation and hydration, and provides references for additional information. The overall message is that nutritional supplementation should be considered on an individual basis in consultation with a health professional.