Stoichiometry deals with the statistical analysis of quantity of reacting agents and finished products in a chemical reaction. The purpose of this text is to provide an insight on the significance of stoichiometry in the biomedical domain. It brings a compilation of chosen research works and evaluations which offer latest updates related to stoichiometry at different stages. In this book, a range of topics like host-guest chemistry, with special emphasis on cyclodextrins and crown ethers derivatives, matters relating to stoichiometry of metal complexes and lipids, importance of stoichiometry in the identification of protein interactions, experimental methods used in certain systems and the interrelation between biomedicine and environment leading to the formulation of the concept of biological stoichiometry have been presented. This text will be of great significance, providing essential scientific data to experts involved in associated fields.