Active formula of vitamin B6 With the P-5-P capsules, vitamin B6 is immediately incorporated into the metabolism. It supports a healthy immune system, the normal nervous system, and reduces tiredness and fatigue. It also contributes to normal energy metabolism and normal protein and glycogen metabolism. It plays a role in the normal formation of red blood cells. Take P-5-P capsules if you are experiencing stress, tiredness and fatigue, taking various medications, consuming alcohol and tobacco frequently, or following a very high-protein diet.