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Ingredient glossary

Hydroxypinacolone Retinoate

What Hydroxypinacolone Retinoate does for your skin, who it suits, and what to watch for.

INCI: Hydroxypinacolone Retinoate · Also: HPR, Granactive Retinoid

Promising, not proven

In short: Hydroxypinacolone Retinoate delivers anti-aging support and texture, suits most skin types, and the evidence behind it is emerging. One thing to know: not for pregnancy or breastfeeding.

What it does
Anti aging, texture
Best for
Most skin types
Watch out
Not for pregnancy or breastfeeding
Evidence
Emerging
How long
Never measured
Does it clash with what you use? Check it →

Written by Maya FaourHow we score →

The molecule

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The Glow take

One of the ingredients I trust most.

When your goal is softening fine lines and keeping skin firm, Hydroxypinacolone Retinoate delivers, though the proof is still catching up to the excitement. Skip it while you are pregnant or breastfeeding, and the rest of the time bring it in slowly.

— Maya

What it does

  • anti aging
  • texture
  • brightening

Hydroxypinacolone Retinoate scores -1 on barrier support. It is one of only 8 ingredients in our glossary that go below zero there. A negative score means it asks something of the barrier rather than giving something back, which is why it needs introducing slowly and pairing with ingredients that do support the barrier. It is not a reason to avoid it: the same evidence that shows the irritation also shows the long-term gains. See where it sits against all 291 of them →

emerging evidenceOne 4-week single-blind split-face trial in 31 Chinese women with skincare-company co-authors found 0.03% of the 9-cis form matched or beat 0.3% retinol on wrinkles elasticity hydration dermal density and radiance with no irritation reported; there was no placebo arm and every other human study tests HPR inside a combination product so its own contribution is still unproven.

On a label: works best above 0.03%.

Who it's for, and who should skip it

Tends to suit

  • normal
  • oily
  • combo
  • sensitive

Approach with care

  • pregnancy
  • breastfeeding
  • Clogs poresLow
  • Irritation riskLow

How it fits each skin type

  • DrySuits
  • CombinationSuits
  • OilySuits
  • SensitiveSuits

Take extra care if any of these apply to you: pregnancy, breastfeeding.

Worried about purging? Here is what the trials actually measured →

Where it fits in your routine

WhenEvening
Where in the orderAfter cleansing, before your moisturizer

Nobody has measured whether Hydroxypinacolone Retinoate changes how your skin handles sun.

No human UV-challenge data. The published human work is a four-week split-face trial measuring wrinkles, elasticity and hydration, plus mouse photoaging models. Inheriting the prescription retinoid caution is an assumption, not a measurement.

No HPR-specific photobiology located; J Invest Dermatol 2026 mouse photoaging model and a 31-woman split-face trial, neither with UV-sensitivity endpoints

Nobody has published how long this takes to work.

What is known, and what is missing

Measured on: wrinkle score and dermal density (the anti-ageing job this base scores 8).

The only human study of HPR on its own sits inside a paper that is otherwise a mouse photoaging model: a single-blind split-face trial in 31 Chinese women, 0.03% 9-cis hydroxypinacolone retinoate daily for four weeks, reported as matching or beating 0.3% retinol on wrinkles, elasticity, hydration, dermal density and radiance. There is no vehicle arm, so the active comparator can only rank HPR against retinol, not date when HPR alone first changes anything; four weeks is where the study stopped, not an onset; and the authors are affiliated with skincare companies. Every other human study puts HPR inside a multi-active product - with retinol glycospheres, salicylic and glycolic acid, niacinamide, papain, peptides or retinyl propionate - so its own contribution is unattributable. Retinol's timeline does not transfer: that would be an assumption about receptor binding, not a measurement.

Hu F et al., J Invest Dermatol 2026;146(8):2105-2127.e6, PMID:41644086 - the 31-woman four-week split-face trial is the human section of this mouse-model paper. Combination studies rejected: PMID:39394831, PMID:25876142, PMID:32869963, PMID:26889724, PMID:36762391, PMID:40029737. No vehicle-controlled trial of HPR alone located.

Plays well with

Hydroxypinacolone Retinoate, answered

Is Hydroxypinacolone Retinoate safe during pregnancy?

No. Hydroxypinacolone Retinoate is best avoided during pregnancy and breastfeeding. If you are pregnant or trying, leave this one out and ask your doctor about a safe alternative.

Who should avoid Hydroxypinacolone Retinoate?

Approach Hydroxypinacolone Retinoate with care if any of these apply to you: pregnancy and breastfeeding.

What concentration of Hydroxypinacolone Retinoate actually works?

Research tends to show Hydroxypinacolone Retinoate starts pulling its weight above 0.03%. If a brand prints the percentage, that is the number to look for.

During pregnancy

Leave Hydroxypinacolone Retinoate out while you are pregnant or breastfeeding. It sits on the list of ingredients usually held back during this time.

When in doubt, check with your doctor or midwife. They outrank any website, including this one.When it is worth booking →

Where Hydroxypinacolone Retinoate sits

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Products with Hydroxypinacolone Retinoate

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Sources & how we reviewed this

  1. PMID 41644086abstract only, the full text is paywalled
  2. PMID 25876142abstract only, the full text is paywalled
  3. PMID 39394831abstract only, the full text is paywalled

Last reviewed August 2026. Educational information about a cosmetic ingredient, not medical advice.