Left Un-Red Reducer Serum redness relief serum pen with refill cartridge and serum texture smear
Left Un-Red Reducer Serum applied to skin to visibly reduce redness and future breakouts
Before and after results showing reduced visible facial redness after using Left Un-Red skincare
Left Un-Red Reducer Serum clinical results showing soothed, hydrated, and less reactive skin
Left Un-Red Reducer Serum ingredient highlights featuring azelaic acid complex and redness-reducing actives
How to apply Left Un-Red Reducer Serum AM and PM on clean, dry skin
Left Un-Red Reducer Serum derm tips for redness-prone and sensitive skin
Left Un-Red skincare routine featuring Reducer Serum, CalmBack Cream, Soft Wash, and Disco Block SPF 50
Dr. Shereene Idriss holding Left Un-Red Reducer Serum with quote about calming redness flare-ups
Left Un-Red Reducer Serum customer reviews and five-star testimonials for redness relief
Left Un-Red Reducer Serum with National Rosacea Society Seal of Acceptance for sensitive skin
Left Un-Red Reducer Serum and CalmBack Cream two-step routine for reducing redness and supporting the skin barrier
Left Un-Red Reducer Serum redness relief serum pen with refill cartridge and serum texture smear
Left Un-Red Reducer Serum applied to skin to visibly reduce redness and future breakouts
Before and after results showing reduced visible facial redness after using Left Un-Red skincare
Left Un-Red Reducer Serum clinical results showing soothed, hydrated, and less reactive skin
Left Un-Red Reducer Serum ingredient highlights featuring azelaic acid complex and redness-reducing actives
How to apply Left Un-Red Reducer Serum AM and PM on clean, dry skin
Left Un-Red Reducer Serum derm tips for redness-prone and sensitive skin
Left Un-Red skincare routine featuring Reducer Serum, CalmBack Cream, Soft Wash, and Disco Block SPF 50
Dr. Shereene Idriss holding Left Un-Red Reducer Serum with quote about calming redness flare-ups
Left Un-Red Reducer Serum customer reviews and five-star testimonials for redness relief
Left Un-Red Reducer Serum with National Rosacea Society Seal of Acceptance for sensitive skin
Left Un-Red Reducer Serum and CalmBack Cream two-step routine for reducing redness and supporting the skin barrier

Left Un-Red Reducer Serum™

A calming serum for redness, flushing and breakouts, powered by azelaic acid, for calmer, more balanced-looking skin.

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For redness, flushing and breakouts that keep coming back
A 10% azelaic acid complex that won't pill, feel gritty or sting
Clinically shown to improve the appearance of skin redness when used with Left Un-Red™ CalmBack™ Cream*
Accepted by the National Rosacea Society
My goodness, not only does it go on heavenly, my redness has gone down so much and so did my stubborn breakouts.
  • Redness
  • Breakouts
Stefany F Verified Buyer

If redness is your main issue, start here.

Azelaic acid is one of the most trusted ingredients for redness, but most serums pill, feel gritty or sting. So Dr. Idriss developed this formula 5% azelaic acid plus 5% potassium azeloyl diglycinate, a form that's easier on skin. Together they make a 10% complex that layers smoothly and calms redness without the sting.

Glycyrrhetinic acid calms irritation and capryloyl glycine balances oil, so it helps with breakouts too.

Accepted by the National Rosacea Society. Fragrance-free, for all skin types and tones.

  • Reduces visible redness and flushing
  • Helps prevent future flare-ups
  • Calms breakouts and balances oil
  • Gentle enough for sensitive skin
  1. Apply AM and PM on clean, dry skin.
  2. Twist bottom of the pen to the left to dispense.
  3. Dispense 2 - 4 pumps per application.
  4. Massage serum all over face.
  5. For best results, follow at night with Left Un-Red CalmBack Cream.

To Refill

  1. Twist the bottom of the pen to the left to unlock the old cartridge.
  2. Remove the cap from a new cartridge.
  3. Pull out the old cartridge and replace with the new one.
“Redness never shows up when it’s convenient. It hits before a big meeting, a date, or right when you’re already stressed. I made Left Un-Red Reducer Serum to calm irritation in the moment and help prevent those future flare-ups from spiraling.”
Dr. Shereene Idriss Board-certified dermatologist
Left Un-Red CalmBack Cream soothing moisturizer jar with green cream texture swipe
Left Un-Red CalmBack Cream™
Night cream to cushion and calm the skin barrier
$58.00
Left Un-Red Redness Duo™
Left Un-Red Redness Duo™
Redness serum + calming cream
$126.00

Left Un-Red Reducer Serum™

Azelaic acid serum for redness

$68.00

Redness needs more than soothing

Treat it instead of hiding it every morning.

  • 0%Agree skin feels less reactive*
  • 0%Agree skin feels hydrated and soothed*
  • Azelaic Acid Complex5% azelaic acid + 5% potassium azeloyl diglycinate for redness relief without the sting
  • Glycyrrhetinic AcidFrom licorice root; calms the irritation behind redness
  • Capryloyl GlycineHelps balance oiliness

Ingredients list

Water/Aqua/Eau, Glycerin, Propanediol, Potassium Azeloyl
Diglycinate, Azelaic Acid, Pentylene Glycol, Caprylic/Capric Triglyceride, Butyrospermum Parkii (Shea) Butter, Dipropylene Glycol, Cetearyl Olivate, Cetyl Alcohol, Sorbitan Olivate, Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Dimethicone, Sodium Hydroxide, Glycyrrhetinic Acid, Hydroxyphenyl Propamidobenzoic Acid, Salix Alba (Willow) Bark Extract, Apricot Kernel Oil Polyglyceryl-6 Esters, Proline, Magnolol, Honokiol, Sodium Phytate, Ascorbyl Palmitate, Bisabolol, Capryloyl Glycine, Ethylhexylglycerin, Butylene Glycol, Sorbitan Oleate, Polyglyceryl-6 Caprylate, Xanthan Gum, Polysorbate 80, Polyglycery-10 Oleate, Isohexadecane, Sorbitan Palmitate, Sodium Bicarbonate, Phenoxyethanol, Yellow 5 (CI 19140), Blue 1 (CI 42090)

*Based on an independent third-party clinical study and consumer perception study of 34 subjects who used the Left Un-Red Reducer Serum and CalmBack Cream for eight weeks

Dr. Shereene Idriss, MD

“Apply it to clean, dry skin and let it settle before your other actives. It works with retinol and vitamin C. If you have rosacea, keep your dermatologist in the loop and use this alongside what they prescribe.

Dab a little extra on blemishes or uneven spots to help fade marks and control oil.”

Dr. Shereene Idriss, MD signature

Dr. Shereene Idriss, MD

Board-Certified Dermatologist

FAQs

Is Left Un-Red Reducer Serum good for rosacea?

It's made for the look of redness.

Dr. Shereene Idriss, MD

Rosacea is a medical condition for your dermatologist to manage. Left Un-Red Reducer Serum improves the look of redness and can sit alongside the care your doctor prescribes. The Left Un-Red line is accepted by the National Rosacea Society.

They can all get along. Apply Reducer Serum to clean skin first, let it settle, then layer your other actives. If you're reactive, introduce new combinations one at a time.

No. Rosacea is a medical condition for your dermatologist to manage. Left Un-Red is designed to improve the look of redness, and it can sit alongside the care your doctor prescribes.

Extensive testing has been conducted and we're excited to share that our Left Un-Red line has earned the National Rosacea Society seal of approval.

One of the serum's active ingredients, hydroxyphenyl propamidobenzoic acid, is not suitable for pregnant or breastfeeding individuals, so we recommend skipping it during this time. As always, check with your doctor about your skincare routine while pregnant or nursing.

The Reducer Serum is made to feel super smooth; that's how it's meant to apply. Put 2 to 4 pumps on clean, dry skin and massage it in fully. If your cartridge stays visibly grainy or gritty after that, don't fight it: email hello@dridriss.com with your order number and we'll take care of you.

Go ahead. Let it dry down fully first, then apply makeup as usual.

Yes, but avoid direct contact with the eyes. If contact occurs, rinse thoroughly with water. Discontinue use immediately if irritation occurs and consult a doctor.

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