Vitamin B5

What is Vitamin B5?

Pantothenic acid is a member of the B-vitamin family, universally present in living cells and named from the Greek 'pantothen,' meaning 'from everywhere,' reflecting its wide distribution in foods. It serves as the precursor to coenzyme A (CoA) and the acyl carrier protein, making it central to carbohydrate, fat, and protein metabolism. Unlike some nutrients with narrow roles, B5 participates in over 100 enzymatic reactions, including the citric acid cycle, fatty acid oxidation, and synthesis of steroid hormones, neurotransmitters, and hemoglobin.

How does Vitamin B5 work?

Once absorbed, pantothenic acid is phosphorylated and incorporated into coenzyme A (CoA), the key molecule that activates acetyl groups for entry into the Krebs cycle and enables acetylation reactions throughout the body. CoA is also required for the synthesis of cholesterol, steroid hormones (cortisol, sex hormones), and acetylcholine, explaining B5's broad physiological relevance. Its derivative dexpanthenol (provitamin B5) is converted back to pantothenic acid in skin tissue, where it promotes keratinocyte proliferation and supports barrier repair — the basis for its topical wound-healing and moisturizing applications.

What forms does Vitamin B5 come in?

Oral supplements are most commonly available as calcium pantothenate in capsule or tablet form, typically ranging from 250mg to 1000mg per dose. Powder forms allow flexible dosing and are popular in high-dose acne protocols. Topical dexpanthenol (commonly branded as Bepanthen or Panthoderm) is widely used in dermatology for wound healing and eczema. Pantethine is available as a separate oral supplement for lipid management. IV dexpanthenol is used in clinical settings for post-surgical paralytic ileus.

Where it comes from:

Pantothenic acid was isolated and identified by Roger J. Williams at the University of Texas in 1933 and fully synthesized by 1940. Its name reflects its ubiquity in food — early researchers found it in virtually every biological sample they analyzed. It was formally recognized as an essential human nutrient and assigned its B5 designation during the mid-20th century classification of the B-vitamin complex. Interest in high-dose B5 for acne emerged in the 1990s following a pilot study by Lit-Hung Leung, and topical dexpanthenol has been used in European dermatology since the 1940s.

What does Vitamin B5 help with?

• Acne: High-dose pantothenic acid is hypothesized to reduce acne by enhancing CoA availability for fatty acid metabolism, thereby reducing sebaceous lipid production and sebum output. A randomized, double-blind, placebo-controlled trial by Yang et al. (2014, Journal of Cosmetic Dermatology, n=41) found that 2.2g/day of a pantothenic acid-based supplement significantly reduced total facial lesion count compared to placebo over 12 weeks, with particularly notable reductions in non-inflammatory lesions. Earlier work by Leung (1995, Medical Hypotheses) proposed the mechanistic framework, but this was a narrative hypothesis paper rather than a controlled trial; the 2014 RCT provides the primary controlled evidence.
• Wound Healing & Skin Repair: Topical dexpanthenol (provitamin B5) stimulates keratinocyte proliferation and migration, accelerates re-epithelialization, and enhances skin barrier function by increasing ceramide and other lipid synthesis in the stratum corneum. Multiple controlled studies have demonstrated that dexpanthenol-containing creams (commonly 5% concentration) reduce wound healing time, decrease redness, and improve skin hydration compared to vehicle controls. A systematic review by Proksch and Nissen (2002, Skin Pharmacology and Physiology) synthesized evidence across dermatological indications including eczema, post-procedure skin care, and surgical wound healing, supporting dexpanthenol's role as a well-evidenced topical wound-healing agent.
• Energy & Fatigue: Pantothenic acid is mechanistically essential for energy production — CoA is required to convert pyruvate to acetyl-CoA for entry into the Krebs cycle, making B5 a bottleneck nutrient for ATP generation from carbohydrates, fats, and amino acids. Clinical evidence for B5 supplementation specifically improving fatigue in non-deficient individuals is limited; however, B5 is frequently included in B-complex formulations studied for energy support, and frank deficiency (rare) produces profound fatigue, sensory disturbances, and 'burning feet syndrome.' Supplementation is most evidently beneficial in those with suboptimal intake rather than well-nourished populations.
• Adrenal Support: The adrenal glands have among the highest concentrations of pantothenic acid in the body, reflecting its essential role in CoA-dependent synthesis of steroid hormones, including cortisol. Animal research established that B5 deficiency impairs adrenal cortical function, and this formed the basis for its traditional use in adrenal support. Robust human RCT evidence specifically demonstrating improved adrenal output or stress resilience from B5 supplementation in healthy or adrenal-fatigued humans is limited; the rationale is primarily mechanistic and biochemical rather than directly demonstrated by controlled clinical trials in this population.
• Lipid Management (as Pantethine): Pantethine, a CoA precursor closer to the active form than pantothenic acid, has been studied as a lipid-lowering agent in multiple controlled trials. A meta-analysis by McRae (2005, Journal of Chiropractic Medicine) reviewed available data and found consistent reductions in total cholesterol, LDL cholesterol, and triglycerides with pantethine supplementation at doses of 600–900mg/day. A subsequent placebo-controlled RCT by Rumberger et al. (2011, Nutrition Research, n=32) found statistically significant reductions in LDL-C and total cholesterol at 16 weeks. This evidence applies specifically to pantethine, not to standard pantothenic acid supplementation.
• Nutritional Deficiency: Isolated pantothenic acid deficiency is extremely rare given its widespread presence in food, but can occur in severe malnutrition, alcoholism, or with highly restricted diets. Clinical deficiency presents as the 'burning feet syndrome,' characterized by painful paresthesias in the lower extremities, fatigue, headache, irritability, and GI disturbance. Supplementation rapidly reverses deficiency symptoms, and this is the most evidence-supported and unambiguous clinical application of pantothenic acid. The RDA for adults is 5mg/day, achievable through any reasonably varied diet.

What can Vitamin B5 help prevent?

• Pantothenic acid deficiency (well-established; adequate dietary intake or supplementation prevents the rare but documented deficiency syndrome including burning feet syndrome and adrenal insufficiency)
• Post-procedure skin breakdown (topical dexpanthenol has controlled evidence supporting prevention of irritant contact dermatitis and skin barrier disruption in clinical dermatology settings)

Which foods are rich in Vitamin B5?

1. Beef liver and chicken liver: Organ meats are among the most concentrated natural sources of pantothenic acid, with beef liver providing approximately 8–10mg per 100g serving — well above the 5mg adult RDA in a single serving.
2. Sunflower seeds: Sunflower seeds provide roughly 7mg of pantothenic acid per 100g, making them one of the richest plant-based sources and a practical daily addition to the diet.
3. Shiitake mushrooms: Cooked shiitake mushrooms contain approximately 3.6mg per 100g of pantothenic acid and are one of the best fungal food sources, with excellent bioavailability from the cooked form.
4. Avocado: A whole avocado provides approximately 2–3mg of pantothenic acid along with healthy fats that support CoA-dependent fat metabolism, making it a practical and nutrient-dense daily source.
5. Eggs (whole): Two large eggs provide approximately 1.6mg of pantothenic acid, and as a complete food with fat and protein, support broader B5-dependent metabolic processes including steroid hormone synthesis.

Practical Tips:

Pantothenic acid is genuinely ubiquitous in food — its name derives from this fact. Deficiency from food alone is virtually unknown in healthy adults eating a varied diet. Heat, canning, and food processing can degrade up to 75% of B5 content, so preferring minimally processed whole foods maximizes intake. Those relying heavily on ultra-processed diets may benefit most from supplementation or dietary correction.

What are the side effects of Vitamin B5?

• Diarrhea and loose stools (most commonly reported at doses exceeding 10g/day in high-dose acne protocols)
• Nausea and mild gastrointestinal discomfort at high doses
• Rare reports of mild skin reactions with topical dexpanthenol (contact sensitization, though this is uncommon)
• Increased urinary frequency (minor, reflects water-soluble excretion of excess B5)

Good to know:

Pantothenic acid has an excellent safety profile at standard doses. The Institute of Medicine has not established a tolerable upper intake level (UL) for B5 due to the lack of documented toxicity in humans, though very high doses (10g+/day) used in some acne protocols have produced GI side effects. As a water-soluble vitamin, excess is readily excreted in urine.

How much Vitamin B5 should you take?

• Recommended daily: Adequate Intake (AI): 5mg/day for adults (men and women). Therapeutic doses vary by indication: 2.2g/day (pantothenic acid) for acne studied in RCT; 600–900mg/day (pantethine) for lipid management; 5% topical dexpanthenol for wound healing and skin repair. High-dose acne protocols have used up to 10g/day but GI tolerance should be monitored.
• Best time of day: Oral supplements are best taken in the morning or with meals. High-dose protocols may be split into 2–4 divided doses throughout the day to minimize GI load and maintain steady CoA precursor availability.
• With or without food: Take with food to improve tolerability, particularly at higher doses. Food also ensures co-presence of other B vitamins that support B5's metabolic functions.
• Time to effect: Deficiency correction: days to 1–2 weeks. Acne improvement: 8–12 weeks of consistent supplementation. Lipid changes with pantethine: 12–16 weeks. Topical wound healing: 1–3 weeks depending on wound severity.
• How long to take it: For general nutritional support, ongoing daily intake at AI levels (5mg) from diet or a B-complex supplement is appropriate without cycling. For therapeutic high-dose use (acne, lipid management), a defined treatment period of 12–16 weeks followed by reassessment is advisable. Long-term high-dose supplementation beyond 6 months should be supervised.