Insulin (See: Insulin) is a major hormone in the human metabolism and is a peptide hormone. It helps in stimulating the cells of the liver, muscle, fat, and tissues to absorb glucose and many other amino acids from the blood. Biosynthetic insulin or biosynthetic human insulin is a genetically synthesized human insulin. It is manufactured for clinical use using recombinant DNA technology. Recombinant DNA are DNA that are formed using laboratory methods like molecular cloning, biopharming, and chemical synthesis of DNA. As against animal insulin, biosynthetic human insulin is purer and has reduced risks of antibody formation. Several analogs of biosynthetic human insulin are available and these are closely linked to the structure of human insulin. These biosynthetic human insulins are used for various glycemic control targets. There are fast-acting and long-acting biosynthetic human insulins. Fast-acting biosynthetic insulin are given in the interval between injection and meal, and the long-acting ones have an effect for a prolonged period of time. Side effects of biosynthetic insulin include rashes, blisters, allergic reaction, seizures, and unconsciousness (experienced by 1% of patients).