B5

Vitamin B5 (Pantothenic Acid)

Vitamins & Minerals

What is Vitamin B5 (Pantothenic Acid)?

Pantothenic acid, or vitamin B5, is a water-soluble vitamin that is an essential component of coenzyme A (CoA), one of the most important cofactors in human biochemistry. CoA participates in over 70 enzymatic pathways including the citric acid cycle, fatty acid synthesis and oxidation, amino acid metabolism, and the synthesis of cholesterol, steroid hormones, melatonin, and acetylcholine. Pantothenic acid is also a component of acyl carrier protein (ACP), which is required for fatty acid synthesis.

The name "pantothenic" derives from the Greek word "pantos" meaning "everywhere," reflecting its widespread presence in foods. Rich sources include organ meats, egg yolks, whole grains, avocados, broccoli, mushrooms, and legumes. Because of its ubiquity in the food supply, clinical deficiency is exceedingly rare in humans and is essentially limited to severe malnutrition. Pantothenic acid status can be assessed through blood levels, urinary excretion, or whole blood CoA levels, though these tests are rarely ordered in clinical practice due to the rarity of isolated deficiency.

Why It Matters

As the precursor to coenzyme A, pantothenic acid sits at a metabolic crossroads—without it, the body cannot synthesize or break down fatty acids, cannot run the citric acid cycle for energy production, and cannot produce essential molecules like heme, cholesterol, and neurotransmitters. CoA is also required for the acetylation of proteins, a post-translational modification that regulates gene expression and enzyme activity. While clinical deficiency is rare, suboptimal B5 status may contribute to fatigue, impaired lipid metabolism, and adrenal insufficiency.

Normal Reference Ranges

GroupRangeUnit
Adults (whole blood)1.6–2.7µmol/L
Adults (urinary excretion)>1.0mg/day

Reference ranges may vary by laboratory. Always compare results to the ranges provided by your testing facility.

What High B5 Levels Mean

Common Causes

  • Supplementation with high-dose pantothenic acid
  • Megadose B-complex vitamins

Possible Symptoms

  • Generally well-tolerated even at high doses
  • Diarrhea at very high doses (>10 g/day)
  • Gastrointestinal discomfort

What to do: No toxic upper limit has been established for pantothenic acid due to its excellent safety profile. At extremely high doses (>10 g/day), diarrhea and gastrointestinal distress may occur. Simply reduce supplementation if these symptoms appear. Excess is readily excreted in the urine.

What Low B5 Levels Mean

Common Causes

  • Severe malnutrition or fasting
  • Chronic alcoholism
  • Malabsorption syndromes
  • Extremely restrictive diets
  • Rare genetic disorders affecting CoA synthesis (pantothenate kinase-associated neurodegeneration)

Possible Symptoms

  • Fatigue and malaise
  • Numbness and burning in feet ("burning feet syndrome")
  • Headaches
  • Irritability and restlessness
  • Sleep disturbances
  • Gastrointestinal distress (nausea, vomiting, abdominal cramps)
  • Impaired wound healing

What to do: Isolated pantothenic acid deficiency is extremely rare and usually indicates severe overall malnutrition. Treatment involves nutritional rehabilitation with a balanced diet and B-complex supplementation. Typical supplemental doses range from 5–10 mg daily. Burning feet syndrome historically responded to pantothenic acid supplementation in prisoners of war. Address underlying malnutrition and evaluate for concurrent vitamin deficiencies.

When Is B5 Testing Recommended?

  • Rarely ordered in clinical practice
  • When severe malnutrition is suspected
  • In evaluation of burning feet syndrome of unclear etiology
  • When pantothenate kinase-associated neurodegeneration (PKAN) is suspected
  • In research settings evaluating B-vitamin status comprehensively

Frequently Asked Questions

The word "pantothenic" comes from the Greek "pantos" meaning "everywhere," and true to its name, vitamin B5 is found in virtually all foods. Meat, vegetables, grains, legumes, eggs, and dairy all contain meaningful amounts. The daily requirement is also relatively modest (5 mg for adults). The combination of widespread dietary availability and low requirements means that deficiency essentially only occurs in severe malnutrition or starvation conditions. In experimental settings, deficiency had to be induced using a specific metabolic antagonist.
Some practitioners and supplement manufacturers claim that high-dose pantothenic acid (5–10 g daily) can treat acne by increasing CoA availability and thereby enhancing fatty acid metabolism. While a few small studies have shown modest improvements in acne lesion counts with pantethine (a derivative), the evidence is limited and not well-established. More robust evidence supports the pantothenic acid derivative dexpanthenol (provitamin B5) as a topical agent for skin barrier repair and wound healing, which is why it appears in many skincare products.
Pantothenic acid is sometimes called the "anti-stress vitamin" because of its role in adrenal steroid hormone synthesis. The adrenal cortex has one of the highest concentrations of pantothenic acid in the body, and CoA is required for the synthesis of cortisol, aldosterone, and adrenal androgens from cholesterol. While this biochemical relationship is well-established, there is limited clinical evidence that supplemental B5 above the recommended daily intake improves adrenal function or stress resilience in well-nourished individuals.

Related Biomarkers

B2Vitamin B2 (Riboflavin)B3Vitamin B3 (Niacin)PLPVitamin B6B12Vitamin B12FolateFolate

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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Reference ranges may vary between laboratories. Always consult your healthcare provider for interpretation of your specific test results.

Disclaimer: SymptomGPT is not a medical diagnosis tool and does not provide medical advice. Always consult a qualified healthcare professional. If you are experiencing a medical emergency, call 911 immediately.