T-Factor from THE PROTEIN WORKS™ contains impressive dosages of proven ingredients designed to stimulate new muscle growth and strength through a variety of mechanisms. These include D-Aspartic Acid, ZMA® (zinc and magnesium) and Vitamin D3. T-Factor helps promote new muscle growth through the activation of muscle building pathways that were dormant or running at below their optimal level. T-Factor can also be used in conjunction with most other supplements in the TPW™ range so you\'re better able to induce muscle repair and increase strength.