Dietary supplements are marketed products intended to supplement the nutrient intake through the consumption of vitamins, minerals, herbs, amino acids, or other biologically active compounds. These products are generally designed to help prevent or treat deficiencies or to support physiological functions by providing components that complement the nutritional value obtained from a standard diet. Scientifically, the efficacy and safety of such products depend heavily on their formulation, bioavailability, and whether the supplemental nutrient gap they aim to fill is clinically significant. The field involves complex interactions between biochemistry, formulation science, and nutritional biology, necessitating rigorous quality control to ensure the identity and concentration of active ingredients.