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Quantum Leap in the Art & Science of Quality Vitamin Supplementation - Source Naturals Coenzymated Sublingual B's. Coenzymated B-1 goes directly into your bloodstream in its active form, ready to go to work immediately. Thiamin diphosphate (TDP) also called thiamin pyrophosphate (TPP) or caraboxylase, is the active, coenzyme form of vitamin B-1.
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