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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 Faour, founder and sole writer; not a dermatologistHow we work →

The molecule

Tap to turn it in 3D

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 388 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…

Why we say this
  • One 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%.

The retinoid family, at a glance

10 retinoid entries in the base, Hydroxypinacolone Retinoate among them. 7 of the 10 are a hero active.

  1. Retinyl Acetate3 steps to retinoic acid
  2. Retinyl Palmitate3 steps to retinoic acid
  3. Retinyl Propionate3 steps to retinoic acid
  4. Retinol2 steps to retinoic acid
  5. Retinal1 step to retinoic acid
  6. Tretinoin0 steps to retinoic acid
  7. Adapalene0 steps to retinoic acid
  8. Tazarotene0 steps to retinoic acid
  9. Retinyl Retinoateroute not established
  10. Hydroxypinacolone Retinoateroute not established
What the family shares: 7 of the 10 are a hero active in the base; the rest carry other roles.Ordered as the retinoid ladder is: by the steps each form is from retinoic acid, the unknown routes last.

Building the section…

The retinoid ladder, walked form by form →

How much do you need?

Not established

No human trial pins a dose. The reasoning is below, and it is the honest answer.

Why we say this
  • No vehicle-controlled human trial exists at any concentration.
  • The only human study of the ester on its own is a single-blind split-face comparison inside a mouse photoaging paper: 0.03% hydroxypinacolone 9-cis retinoate for 4 weeks in 31 Chinese women, reported as matching or beating 0.3% retinol on wrinkles, elasticity and dermal density, with no vehicle side (Hu 2026).
  • The other readings are mixtures: 0.1% with 1% retinol and 2% papain, open-label in 94 acne patients (Veraldi 2015); an Estee Lauder serum with peptides at an undisclosed level against a laser session in 42 women (Kruger 2025); a 5:9 blend with retinyl propionate in 42 women (Wang 2023).
  • A trial against retinol can rank it but cannot set the dose at which it starts to work.

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.

Why we say this
  • 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.

Light, and how to keep it

Keeps well?

Hydroxypinacolone Retinoate breaks down in light. The packaging is doing real work: opaque, and closed between uses.

how it was measured

Among the studied retinoids, the stability of the newer hydroxypinacolone retinoate was the most prominent.PMID 33206444 · abstract

what the source asks of the bottle: opaque, cool

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.

Does Hydroxypinacolone Retinoate go off?

It breaks down in light, and that is the part that has been measured. Among the studied retinoids, the stability of the newer hydroxypinacolone retinoate was the most prominent. So the packaging is not decoration: opaque, and closed between uses. Heat, air and simple age matter too, and we have not sourced numbers for those, so treat this as one reason a product weakens rather than as a shelf life.

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

On the map

See Hydroxypinacolone Retinoate on the clash map →

Compare Hydroxypinacolone Retinoate with

42 comparisons built.

Can you mix Hydroxypinacolone Retinoate with

19 pairings built.

Products with Hydroxypinacolone Retinoate

This, for every label you own

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Sources & how we reviewed this

  1. PMID 41644086abstract read, not the full text
  2. PMID 25876142abstract read, not the full text
  3. PMID 39394831abstract read, not the full text

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

What changed on this page

  • : the highest dose tested
  • : light stability
  • : what the EU regulates

See the full changelog →