Think of your body as a vast, ancient library, where Vitamin B3 (Niacin) isn't the books or the building itself, it is the librarian. It is the steady hand that repairs torn pages of your DNA, the curator that organizes the flow of information between cells, and the energy that keeps the lights on so the whole system can function. Without this "architect," the structure remains, but the wisdom and vitality inside crumble. At a cellular level, Niacin is the primary building bl