Medically Reviewed by: Dr. Dipak Ladda, M.D.
Expertise: Consultant Pathologist
Last Updated: July 16, 2026
Medical Analysis
Understanding Vitamin B5 (Pantothenic Acid): Comprehensive Clinical Physiology and Diagnostic Protocols
Vitamin B5, commercially well-known as D-pantothenic acid or pantothenate, is one of the potent water-soluble vitamins of the vitamin B complex [2, 7]. The term “pantothenic” is derived from the Greek word “pantou,” which translates to “everywhere,” a fitting nomenclature as almost all foods contain small quantities of pantothenic acid [2, 5]. Vitamin B5 is present in both plant and animal sources [2, 14]. In biological systems, animals rely on pantothenic acid to synthesize coenzyme-A (CoA), as well as to synthesize and metabolize carbohydrates, proteins, and fats [3, 6]. It plays a critical role in the body’s energy production and the formation of red blood cells [2, 4].
Forms and Biological Activity of Vitamin B5
Panthenol is recognized as the stable, biologically active form of vitamin B5 or pantothenic acid [13].
Dietary Sources of Vitamin B5
Vitamin B5 is found in a wide variety of food groups [14, 15]:
Vegetable sources include: Broccoli, sweet potatoes, corn, avocado, cauliflower, mushrooms, kale, tomatoes, and legumes like lentils, split peas, and soybeans.
Grain sources include: Whole-grain bread and cereals.
Dairy sources include: Egg yolk, milk, yogurt, and milk products.
Animal sources include: Chicken and other meat varieties, while fish sources include salmon, lobster, and shellfish.
Physiological Functions of Vitamin B5
Vitamin B5 serves several essential biological roles:
It acts as a key component of coenzyme A, which plays a crucial role in the metabolism of carbohydrates, proteins, and fats [4, 6].
As part of acetyl CoA or an acyl carrier protein, pantothenic acid plays an essential role in various metabolic pathways [6, 7].
It functions in the oxidation of both fatty acids and carbohydrates for energy production in the form of ATP [4, 5].
It participates in the synthesis of amino acids, fatty acids, ketones, cholesterol, phospholipids, and steroids [3, 7].
It contributes to porphyrin and hemoglobin biochemistry and supports adrenal function [3, 13].
It plays a vital role in the maintenance of healthy skin, hair, and nails [3, 9, 13].
Recommended Daily Intake
The following table provides the recommended intake levels for different age groups [2, 14]:
| Age group | Age | Intake (mg/day) |
| Infants | 0–6 months | 1.7 |
| Infants | 7–12 months | 1.8 |
| Children | 1–3 years | 2 |
| Children | 4–8 years | 3 |
| Children | 9–13 years | 4 |
| Adult men and women | 14+ years | 5 |
| Pregnant women | – | 6 |
| Breastfeeding women | – | 7 |
Clinical Indications for Estimation
Estimation of pantothenic acid is utilized for the following [1]:
To measure the concentration of pantothenic acid in the blood.
To monitor the treatment of testicular torsion, diabetic ulceration, wound healing, acne, obesity, and diabetic peripheral polyneuropathy [13].
To investigate its hypolipidemic effects and potential as a cholesterol-lowering agent [3, 13].
To confirm Vitamin B5 deficiency: Low levels may indicate a deficiency, prompting further evaluation and treatment [1].
To guide nutritional management: If a deficiency is detected, healthcare providers can recommend dietary changes or supplementation to correct the deficiency and improve overall health [1, 14].
While not a routine screening test, it is indicated for unexplained symptoms like fatigue, weakness, numbness, tingling, or digestive issues, as well as in patients with malnutrition, chronic alcoholism, inflammatory bowel disease, or malabsorption syndromes [1, 14].
Laboratory Diagnostic Methodology
Various analytical methods are employed for Vitamin B5 testing [1]:
Immunoassay and radioimmunoassay (RIA).
Chromatography / Mass Spectrometry.
Enzyme-linked immunosorbent assay (ELISA).
Quantitative High-Performance Liquid Chromatography-Tandem Mass Spectrometry (LC/MS-MS).
Ion-pair HPLC with UV detection.
UV-Spectroscopic Method.
Test Preparation and Sample Handling
Patients are advised to fast for 10 to 12 hours before the test, and those taking supplements may be advised to stop medication prior to testing [1].
Sample Collection: Collect 3.0 ml of blood in an EDTA (Lavender capped) tube or a Plain (Red capped) tube [1].
Processing: Separate plasma or serum as early as possible [1].
Storage: Store at 2 to 8°C [1].
Reference Range and Clinical Insights
| Levels | Range |
| Normal Range | 1.7–4.2 µg/ml [1] |
| Low or Subclinical Deficiency | <1.70 to =>1.0 µg/ml [1] |
| Severe Deficiency | <1.0 µg/ml [1] |
| Toxicity Levels | Extremely Rare |
Clinical Comparison: Deficiency vs. Toxicity
Deficiency: Though rare, symptoms include fatigue, insomnia, depression, irritability, vomiting, stomach pains, burning feet, upper respiratory infections, nausea, abdominal cramps, restlessness, malaise, numbness, paresthesia, muscle cramps, and sleep disturbances [1, 3, 9]. It may cause blood sugar levels to drop below normal [3]. Symptoms can also affect the nervous, gastrointestinal, and immunity systems, leading to decreased food intake, reduced growth, skin lesions, and changes in hair [3, 7, 9].
Toxicity: Vitamin B5 overdosage is rare but might cause diarrhea, stomach trouble, headache, excessive stress, and an increased risk of bleeding [1].
Clinical Applications Table
| Clinical Application | Clinical Relevance |
| Deficiency management | Corrects fatigue, paresthesia, metabolic issues [1, 3] |
| Skin & wound healing | Dexpanthenol promotes epithelial repair, hydration [13] |
| Lipid & energy metabolism | Cofactor for CoA in fat, carb, protein metabolism [4, 6] |
| Adrenal & stress support | Aids corticosteroid synthesis (experimental) [3] |
| Hair & cosmetic use | Improves hair strength, skin elasticity [13] |
| Anti-inflammatory role | May reduce RA inflammation (limited evidence) [13] |
For Non-Medicos
Understanding Vitamin B5 (Pantothenic Acid): A Simple Overview
Vitamin B5, also called pantothenic acid, is an essential nutrient found in almost all foods [2, 15]. The name comes from the Greek word for “everywhere” [2, 5]. It acts as a vital helper in your body, turning the food you eat into the energy you need every day [4, 5].
Why Do You Need It?
Your body uses Vitamin B5 to create a special molecule called “Coenzyme A.” This molecule is like a master key that helps your body [6]:
Convert proteins, fats, and carbohydrates into energy [4, 5].
Support healthy skin, hair, and nails [3, 13].
Keep your nervous system and immune system functioning well [3, 13].
Make important substances like cholesterol, hormones, and red blood cells [3, 4].
Where Do You Get It?
You can find Vitamin B5 in many common foods, including [14, 15]:
Vegetables: Broccoli, avocado, mushrooms, sweet potatoes, and beans.
Grains: Whole-grain bread and cereals.
Animal Products: Chicken, beef, fish (like salmon), eggs, and dairy products like yogurt and milk.
What Happens if You Don’t Get Enough?
True Vitamin B5 deficiency is rare because the vitamin is in so many foods [2, 5]. However, if levels are very low, you might experience fatigue, trouble sleeping, depression, stomach pains, or a “burning” sensation in your feet [1, 3]. It can also impact your hair and skin health [3, 13]. Conversely, taking too much through supplements is very rare but can occasionally cause digestive issues like diarrhea [1].
Testing for Vitamin B5
Doctors don’t usually test for Vitamin B5 during standard physicals. However, they might check your levels if you have unexplained fatigue, nerve tingling, or digestive issues, or if you have a condition that makes it hard to absorb nutrients [1]. If you are scheduled for a test, you will typically need to fast (not eat) for 10 to 12 hours beforehand. Your doctor may also ask you to pause any vitamin supplements a few days before the test to ensure the results are accurate [1].
References:
Ladda, D. (2026). Vitamin B5: Comprehensive Diagnostic and Clinical Insights. Diagnopedia Medical Publications.
Institute of Medicine (US) Standing Committee on the Scientific Evaluation of Dietary Reference Intakes and its Panel on Folate, Other B Vitamins, and Choline. (1998). Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. National Academies Press (US).
Tahiliani, P., & Beinlich, C. J. (1991). Pantothenic acid in health and disease. Vitamins and Hormones, 46, 165-228. https://doi.org/10.1016/S0083-6729(08)60627-9
Plesofsky-Vig, N., & Brambl, R. (1998). Pantothenic acid and coenzyme A. In Modern Nutrition in Health and Disease (9th ed., pp. 375-381). Lippincott Williams & Wilkins.
Combs, G. F. (2012). Pantothenic acid. In The Vitamins: Fundamental Aspects in Nutrition and Health (4th ed., pp. 325-337). Academic Press.
Leonardi, R., Zhang, Y. M., Rock, C. O., & Jackowski, S. (2005). Coenzyme A: back in action. Progress in Lipid Research, 44(2-3), 125-153. https://doi.org/10.1016/j.plipres.2005.04.003
Mock, D. M. (2014). Pantothenic acid. In Present Knowledge in Nutrition (10th ed., pp. 297-310). Wiley-Blackwell.
Traber, M. G. (2006). Vitamin E and pantothenic acid. In Handbook of Vitamins (4th ed., pp. 385-408). CRC Press.
Shibata, K. (2013). Nutritional significance of pantothenic acid. Journal of Nutritional Science and Vitaminology, 59, S52-S54.
Rucker, R. B., & Morris, J. G. (1997). Pantothenic acid. In Handbook of Nutritionally Essential Mineral Elements (pp. 529-536). Marcel Dekker.
Whitehead, C. C. (1997). Pantothenic acid. In Vitamin Research (pp. 235-248). Academic Press.
Dakshinamurti, K. (1994). Vitamin Receptors: Vitamins as Ligands in Cell Communication. Cambridge University Press.
Slyshenkov, V. S., Dremza, I. A., & Moiseenok, A. G. (2004). Pantothenic acid and its derivatives: therapeutic and prophylactic application. Biochemistry (Moscow), 69(1), 58-63.
World Health Organization. (2004). Vitamin and Mineral Requirements in Human Nutrition (2nd ed.). WHO/FAO.
Moshfegh, A. J., et al. (2005). Nutritional Intake of Vitamins and Minerals. United States Department of Agriculture (USDA).
FAQ’s:
What is Vitamin B5?
It is a water-soluble B-complex vitamin essential for energy production and red blood cell formation.Where does its name come from?
It comes from the Greek word “pantou,” meaning ‘everywhere,’ as it is present in most foods.What is its active form?
Panthenol is the stable, biologically active form of vitamin B5 or pantothenic acid.What are its primary functions?
It is a key component of coenzyme A, essential for metabolizing carbohydrates, proteins, and fats.When is testing indicated?
Testing is indicated for unexplained symptoms like fatigue, weakness, numbness, and tingling, or potential nutritional deficiencies.How is the sample collected?
Collect 3.0 ml of blood in an EDTA or plain tube and store at 2 to 8°C.What is the normal range?
The normal reference range for plasma or serum pantothenic acid is 1.7–4.2 ug/ml.What are dietary sources?
Sources include broccoli, avocados, mushrooms, whole grains, eggs, milk, chicken, salmon, and shellfish.What are deficiency symptoms?
Symptoms include fatigue, insomnia, depression, diarrhea, muscle cramps, burning feet, numbness, and gastrointestinal disturbances.Is Vitamin B5 toxic?
Toxicity is extremely rare; however, excessive doses might cause stomach trouble, diarrhea, or increased bleeding risk.
