Get the most effective B6 ever for cardiovascular maintenance with P-5-P from Swanson. P-5-P is the metabolically active form of vitamin B6 that goes to work immediately. In order for vitamin B6 to be utilized by the body, it must be converted by the liver into its active coenzyme form. P-5-P lets your body side-step this conversion process for more rapid and efficient assimilation. P-5-P is needed by the body for muscle growth and repair, healthy neurotransmitter function and more.