Vitamin B5
Also known as: Pantothenic Acid
What Does Vitamin B5 Measure?
Vitamin B5, also known as pantothenic acid, is a water-soluble B vitamin that plays an essential role in energy metabolism and the synthesis of coenzyme A (CoA), a critical molecule involved in numerous biochemical reactions throughout the body. Blood tests for Vitamin B5 typically measure its concentration in whole blood or plasma, reflecting recent dietary intake and overall nutritional status. Since pantothenic acid is a precursor to CoA, adequate levels are necessary for the metabolism of carbohydrates, fats, and proteins into usable energy.
Why Does Vitamin B5 Matter?
Vitamin B5 is vital for the production of steroid hormones, red blood cells, and neurotransmitters, as well as for maintaining a healthy skin barrier and supporting wound healing. It also plays a crucial role in the synthesis of acetylcholine, a neurotransmitter important for brain function and muscle control. Although true deficiency is rare due to the widespread availability of pantothenic acid in foods, suboptimal levels can lead to fatigue, neurological symptoms, and impaired immune function. Monitoring Vitamin B5 is particularly relevant for individuals with malnutrition, malabsorption disorders, or those following highly restrictive diets.
Normal Ranges
Males
0.2–1.8 µmol/L (whole blood); some labs report 1.57–4.52 µg/mL
Females
0.2–1.8 µmol/L (whole blood); some labs report 1.57–4.52 µg/mL
Children
Varies by age; generally similar to adult ranges but lower absolute values in infants
Causes of High Levels
- Excessive supplementation or megadose vitamin B5 intake
- High dietary consumption of pantothenic acid-rich foods over a short period
- Renal insufficiency or kidney disease impairing excretion of water-soluble vitamins
- Use of pantethine supplements (a derivative of pantothenic acid) in high doses
- Laboratory error or hemolysis affecting test accuracy
Causes of Low Levels
- Malnutrition or severely restricted caloric intake
- Malabsorption syndromes such as Crohn's disease or celiac disease
- Chronic alcoholism, which impairs nutrient absorption and metabolism
- Prolonged use of certain medications, including some antibiotics that disrupt gut microbiota
How to Improve Your Vitamin B5
Diet
- Eat organ meats such as liver and kidney, which are among the richest sources of pantothenic acid
- Include chicken, beef, and salmon in regular meals, as animal proteins provide high bioavailable B5
- Consume whole grains like oats, brown rice, and whole wheat bread rather than refined grains
- Add legumes such as lentils, chickpeas, and sunflower seeds to daily meals
- Incorporate avocados, sweet potatoes, and mushrooms, which are excellent plant-based sources of B5
Supplements
- Calcium pantothenate (standard supplemental form): 5–10 mg/day for maintenance; up to 100–500 mg/day under medical supervision for therapeutic use
- Pantethine (active form): 300–600 mg/day, often used to support cholesterol metabolism
- B-complex vitamin supplements containing at least 5–10 mg of pantothenic acid per serving
- Dexpanthenol (provitamin B5): used topically or in injectable form for clinical deficiency treatment
- Consult a healthcare provider before exceeding 500 mg/day as very high doses may cause gastrointestinal discomfort
Related Biomarkers
Frequently Asked Questions
Can Vitamin B5 deficiency cause hair loss?
Yes, pantothenic acid deficiency has been associated with hair thinning and hair loss in some individuals. B5 plays a role in supporting the health of hair follicles by contributing to fatty acid synthesis and cellular energy production. While B5 deficiency as the sole cause of hair loss is rare, suboptimal levels may contribute to thinning hair, particularly when combined with deficiencies in other B vitamins. Many hair health supplements include pantothenic acid for this reason.
Is it possible to get too much Vitamin B5?
Vitamin B5 toxicity is extremely rare because it is water-soluble and excess amounts are excreted through urine. Very high doses—typically above 1,000–2,000 mg per day—may cause gastrointestinal side effects such as diarrhea, nausea, and stomach cramps. There is no established tolerable upper intake level (UL) set by major health organizations, but it is still advisable to stay within recommended supplemental ranges unless directed by a healthcare professional.
Why is Vitamin B5 called the 'anti-stress vitamin'?
Vitamin B5 has earned the nickname 'anti-stress vitamin' because it is essential for the synthesis of adrenal hormones, including cortisol, the body's primary stress-response hormone. Pantothenic acid supports the adrenal glands in producing steroid hormones that help the body cope with physical and emotional stress. During prolonged stress, the body's demand for pantothenic acid increases, and deficiency may impair the stress response, leading to fatigue and adrenal exhaustion.