Vitamin B5 (Pantothenic Acid)

Builds coenzyme A, the hub that turns carbs, fat and protein into fuel.

Mechanisms, studies and evidence grades for each claim above.

Core mechanism

B5 converts to CoA, which carries acyl groups and enables metabolism of carbohydrates, fats, and proteins.

Energy metabolism

CoA is required for converting pyruvate to acetyl-CoA (linking glycolysis to the TCA cycle), fatty acid oxidation (β-oxidation), and TCA cycle reactions generally — the central molecule for fuel entry and utilization.¹

Lipid metabolism

Required for both fatty acid synthesis and breakdown — it regulates fat metabolism in both directions.

Acetylation / cellular function

CoA forms acetyl-CoA, used for energy production, protein acetylation (a form of cellular regulation), and various synthesis pathways.

Brain / neurochemistry

Acetyl-CoA is required for acetylcholine synthesis, a key neurotransmitter.

Interaction with other nutrients

Works with B1 (supports acetyl-CoA production), B2/B3 (downstream energy production), and magnesium (ATP activation) — a central connector in the broader energy system. See Vitamin B1, Vitamin B2, Vitamin B3, Magnesium.

Deficiency

Rare, but affects high-energy-demand systems when it occurs. Potential symptoms: fatigue, neurological issues, impaired metabolism.¹

Transport / absorption

Absorbed in the small intestine via active transport; widely distributed in tissues.

Intake

Roughly 5 mg/day.

Top foods

• Liver
• Chicken
• Avocado
• Sunflower seeds
• Raw milk

Key insight

Vitamin B5 enables CoA formation — a central molecule required for converting nutrients into usable metabolic intermediates and energy.¹

References