Vitamin B5
Also known as: Pantothenic acid, Calcium pantothenate, Pantothenate
The coenzyme-A vitamin — ubiquitous in food, nearly impossible to be deficient in, and famous for a contested acne claim.
In short
Vitamin B5 (pantothenic acid) is an essential water-soluble B vitamin that forms part of coenzyme A (CoA) — the molecule that carries acetyl groups in energy metabolism, fatty-acid synthesis, and hormone production. Because it is present in virtually every food (its name literally means 'from everywhere'), deficiency is essentially confined to severe malnutrition, and supplements are rarely needed. Its fame in the supplement world comes from the 1990s 'B5 for acne' hypothesis, proposing that high doses reduce sebum production; small, flawed trials have suggested benefit, but no high-quality evidence confirms it, and high doses cause gastrointestinal side effects. In skincare, its derivative panthenol (provitamin B5) is a well-evidenced humectant — a different molecule with a different story.
- Essential B vitamin; part of coenzyme A
- Deficiency essentially impossible outside severe malnutrition
- 'B5 for acne' claims rest on weak trials
- Panthenol (provitamin B5) is the skincare hero, not B5 itself
What is Vitamin B5?
Vitamin B5 is the vitamin you are already getting plenty of. Pantothenic acid sits inside coenzyme A, the universal metabolic carrier that every cell uses to burn fuel and build fats — and since it appears in almost every food, nature made sure scarcity is nearly impossible. The supplement industry found a use for it anyway: a 1990s hypothesis claimed megadoses cure acne by drying out sebum. Decades later, the evidence remains thin and the doses uncomfortable. Meanwhile, B5's skincare cousin panthenol quietly does the real work — which is a useful reminder that a vitamin and its derivatives can tell very different stories.
Where it comes from
Natural sources
- Ubiquitous in food: meat, eggs, whole grains, legumes, avocado, mushrooms
- Name from Greek pantos — 'from everywhere'
- Gut bacteria also synthesize it
How it's made
Calcium pantothenate in multis; high-dose acne protocols use 2–10 g/day (not recommended).
What it does in products
Benefits
Energy metabolism
strong evidenceAs the CoA backbone, B5 is indispensable to carbohydrate, fat, and protein metabolism — the textbook essentiality that makes deficiency catastrophic.
Deficiency correction
strong evidenceSupplementation reverses the rare deficiency (burning feet, fatigue) seen only in extreme malnutrition or metabolic disease.
Acne treatment (high-dose)
emerging evidenceA 1995 open-label study and small trials suggest possible benefit at 2+ g/day, but no rigorous randomized evidence confirms it; side effects at these doses are common.
Side effects & safety
Safety considerations
- Safe at dietary and standard supplement levels (RDA 6 mg during pregnancy).
- None significant at normal doses.
- Not for: None at standard doses; high-dose protocols discouraged without supervision
How it's used
In supplements
RDA: 5 mg adults. Multivitamins supply 5–10 mg. High-dose acne protocols (2–10 g) are not evidence-backed and cause GI effects.
In skincare
Not B5 itself — panthenol (provitamin B5) is used at 0.5–5% as a humectant.
Regulatory status
- Sold as a dietary supplement; no FDA-approved disease claims.
- GRAS (generally recognized as safe) for food use.
- Panthenol assessed as safe in cosmetics.
Popular products containing Vitamin B5
- Any standard multivitamin — Typical 5–10 mg B5 contentVarious · Supplement
- NOW Pantothenic Acid 500 mg — High-dose B5 capsulesNOW Foods · Supplement
- La Roche-Posay Cicaplast Baume B5 — Panthenol (provitamin B5) skin balmLa Roche-Posay · Skincare
Product names and brands are shown for reference and belong to their respective owners.
The acne hypothesis
The 1990s theory proposed that B5 deficiency causes acne, and megadoses correct it by increasing CoA — but the mechanism invoked (reduced sebum via fatty-acid metabolism shifts) has never been convincingly demonstrated in controlled settings. The supporting literature is dominated by one small open-label study and case reports; subsequent reviews have called the evidence inadequate. High doses reliably cause GI distress, which makes the risk-benefit unfavorable for most.
B5 vs panthenol
Panthenol is the alcohol analog of pantothenic acid. Applied to skin, it converts to B5 but first acts as a humectant, drawing water into the stratum corneum — the reason 'B5' balms like Cicaplast work for barrier repair. The skincare evidence attaches to panthenol, not to oral B5.
Frequently asked questions
Do I need a B5 supplement?
Almost certainly not — deficiency requires severe malnutrition. Dietary intake is effectively universal in developed countries.
Does B5 cure acne?
The evidence is weak and the doses needed are high and GI-upsetting. Standard acne treatments are far better supported.
Is the B5 in skincare the same as the vitamin?
Skincare uses panthenol (provitamin B5), a derivative with well-documented humectant and barrier benefits — related to, but not identical with, the oral vitamin.
The bottom line
Vitamin B5 is metabolically essential and nutritionally unavoidable — while its famous acne megadose protocol remains evidence-poor, and the skincare magic belongs to its derivative panthenol.
References
- Pantothenic acid — Health Professional Fact Sheet. NIH Office of Dietary Supplements. https://ods.od.nih.gov/factsheets/PantothenicAcid-HealthProfessional/
- Pantothenic acid in acne: evidence review. PubMed Central. https://pubmed.ncbi.nlm.nih.gov/26897386/
- Panthenol in skin care. PubMed. https://pubmed.ncbi.nlm.nih.gov/27123371/