Pantothenic Acid (B5) vs Vitamin B6 (P5P)

Mechanism

Pantothenic acid is converted to Coenzyme A (CoA), the universal acyl-group carrier essential for >100 metabolic reactions. CoA is required for: fatty acid synthesis and beta-oxidation, citric acid cycle (acetyl-CoA entry), steroid hormone synthesis (pregnenolone from cholesterol), acetylcholine synthesis, melatonin synthesis, and Phase II detoxification (acetylation reactions). Pantethine (the active form) supports healthy lipid metabolism by inhibiting hepatic HMG-CoA reductase and fatty acid synthase, while stimulating fatty acid oxidation.

Standard Dosing

500mg pantothenic acid or 300mg pantethine twice daily

Timing

With meals. Split doses for pantethine.

Cycle Duration

ongoing

Side Effects

• Diarrhea at high doses
• GI discomfort
• Contact dermatitis (topical dexpanthenol)

Contraindications

• Hemophilia (theoretical concern: pantethine may have mild antiplatelet effect at high doses)

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Mechanism

Pyridoxal-5-phosphate (P5P) is the active coenzyme form of vitamin B6, required by over 150 enzymes. Key roles: transamination and decarboxylation of amino acids, serving as a cofactor for aromatic L-amino acid decarboxylase (converting 5-HTP to serotonin and L-DOPA to dopamine), glutamic acid decarboxylase (producing GABA), cystathionine beta-synthase (homocysteine transsulfuration to cysteine), serine hydroxymethyltransferase (one-carbon folate metabolism), glycogen phosphorylase (glycogenolysis), and aminolevulinic acid synthase (heme synthesis).

Standard Dosing

25-50mg P5P daily

Timing

Morning with food. Often included in B-complex.

Cycle Duration

ongoing

Side Effects

• Peripheral neuropathy at chronic doses >200mg/day (numbness, tingling)
• Photosensitivity
• Nausea
• Vivid dreams

Contraindications

• Levodopa monotherapy
• Doses >200mg/day chronically (peripheral neuropathy risk)

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