SHR # 2070 :: New Peptide Alert: Thymosin Alpha 1 + This Ain't Your Grandma's Back Extension :: Dr. William Seeds - Coach Charles Staley - The Thymosin family of protein peptides are proving to be amazing for a variety of conditions. The immune system is the human body's operating system that all other functions depend upon. Thymosin Alpha 1 has some interesting properties that make it useful for hard-training athletes and the frail and elderly alike. PLUS Most people miss out on the real potential of the back extension by using bodyweight only or limiting the weight load used. Magic happens when you go heavy with this movement. ::