P-5-P PlusPyridoxal 5' Phosphate with magnesium. Pyridoxal 5 Phosphate, the active form of vitamin B6, is supplied with magnesium, an essential mineral that assists B6 metabolism. Magnesium bisglycinate chelate is a well tolerated form of magnesium that is easily and comfortably assimilated without irritation of GI tissues. P 5 P Plus is especially useful for those with inadequacies of both B6 and magnesium, amino acid imbalances, or compromised liver function.