AOR P-5-P - Pyridoxal-5'-Phosphate is the biologically active form of vitamin B6 that is utilized by the body. Studies show that for people with compromised liver function, P5P is 3 times more likely to be absorbed than conventional B6. Inadequate levels of plasma P-5-P can lead to anemia, depression, dermatitis, hypertension, water retention, insomnia, premenstrual tension, irritability, muscle twitching, convulsions, and kidney stones.