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P-5-P The Most Active Form of B6 KAL® P-5-P features Pyridoxal-5-Phosphate, the coenzyme form of Vitamin B-6 which does not have to be converted in the body and can go directly into metabolic cycles. P-5-P may be more helpful as a Vitamin B-6 supplement than other forms. Vitamin B-6 provides nutritive support for red blood cell synthesis and nerve tissue function.