Biosynthesis is the process in your body that turns simple structures into more complex structures. It can happen within a single cell (or within a single organelle within a cell), or across multiple cells. Sometimes all that is required for biosynthesis is for two substances to physically join together to make a new physical substance, which is called a macromolecule.
Related Journals of Biosynthesis
Journal of Physiobiochemical Metabolism, Journal of Natural Products, Journal of Nanomaterials, SYNTHESIS, Journal of Experimental Botany