As a fourth year medical student in the Army I have had a busy schedule for years. This product has kept my mind ready to perform and conquer any and all tasks that it has had before it. I first heard about it from Mark Divine on his Unbeatable Mind podcast years ago. I have been taking it for years and it is the best supplement that I take for mental and physical toughness, endurance, and grit. I attribute much of my ability to focus and succeed in medicine and beyond to this product and thi...Read more.