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Panthenol

Also known as: Provitamin B5, Dexpanthenol, D-panthenol

A provitamin B5 conditioning ingredient with short-term topical hydration evidence, not an oral B5 dose or a hair-regrowth guarantee.

Clear liquid and pale cream on an ivory tile
Editorial illustration

Panthenol is a provitamin B5 ingredient used for skin and hair conditioning. A controlled topical dexpanthenol study found short-term improvements in hydration and water-loss measures with specific vehicles. That supports a bounded formulation claim, not a promise that every panthenol cream treats eczema, heals wounds or regrows hair.1, 2

  • A provitamin B5 cosmetic ingredient.2
  • The controlled study evaluated topical dexpanthenol in two lipophilic vehicles.1
  • The reported barrier-measure improvement followed seven days of treatment.1

What is Panthenol?

Dexpanthenol refers to the D form of panthenol; pantothenic acid is the related vitamin. These names are connected but should not be treated as one route or one clinical intervention. A skincare ingredient's conversion-related chemistry does not turn its labeled percentage into a nutritional B5 dose.2

Where it comes from

Natural sources

  • Related to pantothenic-acid biology; commercial panthenol is not a food extract.

How it's made

Manufactured panthenol grades specify chemical identity and stereochemical composition.

What it does in products

  • Skin-conditioning humectant
  • Hair conditioning
  • Solvent in some formulations

Benefits

Short-term hydration and barrier measures

moderate evidence

The randomized vehicle-controlled study found improved stratum-corneum hydration and reduced transepidermal water loss with dexpanthenol.1

The study tested specified lipophilic vehicles over seven days. Instrumental barrier measures are not proof of durable eczema control, wound healing or identical performance from every panthenol product.

Hair-conditioning function

limited evidence

Panthenol is documented as a hair-conditioning ingredient, which is different from stimulating new follicles.2

CIR records function and safety, not clinical hair-regrowth efficacy or superiority of a particular shampoo.

Evidence scope and limitations

Topical panthenol and D-panthenol, a short controlled barrier study and the 2022 cosmetic safety assessment; excludes oral B5 and injected preparations.

  • The barrier study was short and vehicle-specific.
  • Conditioning function does not establish hair growth or a disease-treatment outcome.

Evidence last checked: 2026-10-01

Side effects & safety

Formula-related irritation or individual intolerance (varies)The assessed cosmetic uses do not guarantee that every finished product is tolerated.

Safety considerations

  • Topical dexpanthenol evidence does not establish the effect of oral B5 supplementation or every combination routine.
  • Not for: Avoid a product that causes a reproducible reaction, even if marketed as soothing.
2, 3

Amounts studied & product use

These figures describe research or common product use, not a personal dose or treatment recommendation.

In skincare studies and products

The controlled study's seven-day treatment and specified lipophilic vehicles are research conditions. No universal optimal panthenol percentage is set here; stereochemical form and the rest of the formula matter.

1, 2

Regulatory status

  • A U.S. cosmetic conditioning ingredient. A barrier-measure trial does not grant FDA-approved eczema or hair-regrowth claims.
  • INCI name on cosmetic labels: Panthenol.
  • 2022 report assessed panthenol, pantothenic acid and named derivatives under reported cosmetic use conditions.
4

A better barrier measurement is a specific outcome

Transepidermal water loss is an instrumentally measured endpoint, not a complete assessment of every skin disease. The study's duration and vehicle need to stay attached to the result.

The same distinction applies to hair: conditioning the existing fiber is not generating new follicles. A B5 association cannot bridge that clinical gap by itself.

1, 2

Frequently asked questions

Is panthenol the same as an oral B5 supplement?

No. This guide concerns topical panthenol and dexpanthenol. A cosmetic percentage is not a pantothenic-acid dietary dose.2

Does it regrow hair?

The cited CIR assessment documents hair conditioning, not a controlled hair-regrowth result.2

The bottom line

Panthenol has a credible conditioning role and bounded short-term hydration evidence. Keep those claims separate from disease treatment and hair regrowth.

References

  1. Gehring W, Gloor M. Effect of topically applied dexpanthenol on epidermal barrier function and stratum corneum hydration. Results of a human in vivo study. Arzneimittelforschung (2000) · randomized trial · PMID 10965426; DOI 10.1055/s-0031-1300268
  2. Scott LN, Fiume M, Bergfeld WF et al.. Safety Assessment of Panthenol, Pantothenic Acid, and Derivatives as Used in Cosmetics. International Journal of Toxicology / Cosmetic Ingredient Review (2022) · safety assessment · PMID 36177798; DOI 10.1177/10915818221124809
  3. Allergens in Cosmetics. U.S. Food and Drug Administration · government guidance · Undated live resource; accessed October 1, 2026
  4. FDA Authority Over Cosmetics: How Cosmetics Are Not FDA-Approved, but Are FDA-Regulated. U.S. Food and Drug Administration (2013) · government guidance · Page updated August 3, 2013; accessed October 1, 2026

Revision history

  1. Initial AI-assisted evidence compilation with source-linked claims, formulation distinctions and explicit research limitations; not independent medical review.