Thymosin Alpha 1 is a polypeptide hormone secreted by the thymus, which is a vital component of the immune system that controls the maturation of T-cells. T-cells come in two forms: killer and helper cells. Killer T-cells are responsible for hunting down and destroying our body’s own cells that are cancerous or infected with bacteria or viruses. TA1 is thought to modulate the immune system by augmenting T-cell function. TA1 may affect thymocytes by stimulating their differentiation or by converting them to active T-cells. It is most often given for chronic viral diseases, but has also been shown to increase innate immunity factors and help fight against harmful autoimmune processes. It is given to help control inflammation associated with chronic diseases, which can cause excess fatigue.