This serum is designed to calm visible redness and address breakouts. Its formula aims to reduce flushing and blemishes, making it a good option for those with sensitive or acne-prone skin experiencing redness.
Sephora price
$68.00
Price matters most when you are trying to learn whether this lane belongs in your routine without turning the test into a luxury gamble.
Sephora reviews
4.4 / 5
About 115 reviews on the current Sephora source, so there is real volume behind the reputation.
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Glass take
4.4 / 5 overall fit
A targeted treatment for redness and breakouts that plays well with most skin types.
Sephora snapshot refreshed April 23, 2026
Price, rating, review count, and source status come from Sephora. Glass adds the routine fit, overlap risk, and what to compare next.
View SephoraWhat Sephora says
A redness-reducing azelaic acid treatment serum that targets flushing and breakouts, with the National Rosacea Society Seal of Acceptance.
Apply morning and night on clean, dry skin.
Twist bottom of the pen to the left to dispense.
Dispense two to four pumps per application.
Massage serum all over face.
For best results, follow at night with Left Un-Red CalmBack Cream (sold separately).
What Glass adds
A focused treatment for redness and blemishes. It’s a good choice if these are your primary concerns and you want a product with a clear purpose.
Calms redness effectively
Users report a noticeable reduction in redness and flushing after consistent use.
Helps with breakouts
The serum is credited with helping to clear up blemishes and prevent new ones from forming.
Best for
Skip if
Routine fit
Apply after cleansing and before heavier creams. It can be used both morning and night. For nighttime use, consider layering with the Dr. Idriss Left Un-Red CalmBack Cream for enhanced results.
Why it works
The useful question is not whether this product is good in a vacuum. It is whether it makes your routine easier to run or just adds one more bottle with a familiar ingredient on it.
What it actually does well
Where it starts to feel redundant
Routine fit
Morning and Night
This serum is formulated for twice-daily use. Apply it to clean, dry skin as a treatment step before your moisturizer.
Glass rating
A targeted treatment for redness and breakouts that plays well with most skin types.
Routine fit
4.5 / 5
This serum fits easily into AM and PM routines, targeting specific concerns without overwhelming the skin.
Full ingredient breakdown
Solvent
Badness
0.0 / 10
The base of the formulation, dissolving other ingredients.
Usually helps with
All skin types
Watch for
None
Humectant
Badness
0.0 / 10
Attracts water to the skin, keeping it hydrated and supple.
Usually helps with
All skin types
Watch for
None
Humectant
Badness
0.0 / 10
A solvent and humectant that helps improve product texture and skin hydration.
Usually helps with
All skin types
Watch for
None
Active
Badness
1.0 / 10
A derivative of azelaic acid, it helps to control oil production and reduce the appearance of redness.
Usually helps with
Oily skin, redness
Watch for
None
Active
Badness
2.0 / 10
Targets redness, inflammation, and breakouts. It also helps to improve skin texture and tone.
Usually helps with
Redness, acne, hyperpigmentation
Watch for
Can cause mild stinging or irritation in some individuals, especially at higher concentrations.
Humectant
Badness
0.0 / 10
A multi-functional ingredient that acts as a humectant and preservative booster.
Usually helps with
All skin types
Watch for
None
Emollient
Badness
0.0 / 10
A skin-conditioning agent derived from coconut oil and glycerin that helps to replenish the skin's surface.
Usually helps with
Dry skin, normal skin
Watch for
None
Emollient
Badness
0.0 / 10
A rich emollient that moisturizes and soothes the skin.
Usually helps with
Dry skin, sensitive skin
Watch for
Can be comedogenic for some acne-prone individuals.
Solvent
Badness
1.0 / 10
A solvent that can also act as a fragrance ingredient. Can be irritating for sensitive skin.
Usually helps with
Normal skin
Watch for
Potential for irritation in sensitive skin.
Emulsifier
Badness
0.0 / 10
An emulsifier derived from olive oil that helps to blend oil and water in formulations.
Usually helps with
All skin types
Watch for
None
Emollient
Badness
0.0 / 10
A fatty alcohol that softens and smooths the skin.
Usually helps with
Dry skin, normal skin
Watch for
None
Emulsifier
Badness
0.0 / 10
An emulsifier derived from olive oil that helps to stabilize formulations.
Usually helps with
All skin types
Watch for
None
Thickener
Badness
0.0 / 10
A polymer used to thicken cosmetic formulations.
Usually helps with
All skin types
Watch for
None
Emollient
Badness
0.0 / 10
A silicone that creates a smooth feel and forms a protective barrier on the skin.
Usually helps with
All skin types
Watch for
Can be pore-clogging for some acne-prone individuals.
pH Adjuster
Badness
0.0 / 10
Used to adjust the pH of the product to ensure stability and efficacy.
Usually helps with
All skin types
Watch for
None
Soothing Agent
Badness
1.0 / 10
Derived from licorice root, it has anti-inflammatory and soothing properties that help calm redness.
Usually helps with
Sensitive skin, redness
Watch for
None
Soothing Agent
Badness
1.0 / 10
A synthetic derivative of avenanthramide (found in oats) that helps to soothe and calm irritated skin.
Usually helps with
Sensitive skin, redness
Watch for
None
Exfoliant
Badness
2.0 / 10
Contains natural salicylic acid, which can help exfoliate and decongest the pores. Also has anti-inflammatory properties.
Usually helps with
Acne-prone skin, oily skin
Watch for
Can cause irritation for some, especially when combined with other exfoliants.
Emulsifier
Badness
0.0 / 10
A gentle emulsifier derived from apricot kernel oil.
Usually helps with
All skin types
Watch for
None
Amino Acid
Badness
0.0 / 10
An amino acid that plays a role in collagen production and skin repair.
Usually helps with
All skin types
Watch for
None
Antioxidant
Badness
1.0 / 10
A compound found in magnolia bark, known for its antioxidant and anti-inflammatory properties.
Usually helps with
All skin types
Watch for
None
Antioxidant
Badness
1.0 / 10
Another compound from magnolia bark, working with Magnolol to provide antioxidant and anti-inflammatory benefits.
Usually helps with
All skin types
Watch for
None
Chelating Agent
Badness
0.0 / 10
A natural chelating agent that helps to improve the stability of formulations.
Usually helps with
All skin types
Watch for
None
Antioxidant
Badness
1.0 / 10
A fat-soluble form of Vitamin C that acts as an antioxidant, protecting skin from free radical damage.
Usually helps with
All skin types
Watch for
Can be less potent than L-Ascorbic Acid.
Soothing Agent
Badness
1.0 / 10
A component of chamomile, it helps to calm and soothe the skin, reducing redness and irritation.
Usually helps with
Sensitive skin, redness
Watch for
None
Skin Conditioning Agent
Badness
1.0 / 10
Helps to regulate sebum production and has antimicrobial properties.
Usually helps with
Oily skin, acne-prone skin
Watch for
None
Preservative Booster
Badness
1.0 / 10
A preservative enhancer that also has skin-conditioning properties.
Usually helps with
All skin types
Watch for
Can be a skin irritant for some.
Humectant
Badness
1.0 / 10
A humectant that helps to draw moisture into the skin and improve product texture.
Usually helps with
All skin types
Watch for
Can be a skin irritant for some.
Emulsifier
Badness
0.0 / 10
An emulsifier that helps to blend oil and water components in a formula.
Usually helps with
All skin types
Watch for
None
Emulsifier
Badness
0.0 / 10
A gentle, water-in-oil emulsifier.
Usually helps with
All skin types
Watch for
None
Thickener
Badness
0.0 / 10
A natural thickening agent that improves product texture.
Usually helps with
All skin types
Watch for
None
Emulsifier
Badness
1.0 / 10
An emulsifier that helps to disperse oils in water. Can be a skin irritant for some.
Usually helps with
Normal skin
Watch for
Potential for irritation in sensitive skin.
Emulsifier
Badness
0.0 / 10
A gentle emulsifier used to create stable emulsions.
Usually helps with
All skin types
Watch for
None
Emollient
Badness
0.0 / 10
An emollient that provides a smooth, non-greasy feel on the skin.
Usually helps with
All skin types
Watch for
None
Emulsifier
Badness
0.0 / 10
An emulsifier that helps to stabilize oil-in-water formulations.
Usually helps with
All skin types
Watch for
None
pH Adjuster
Badness
0.0 / 10
Used to adjust the pH of the product.
Usually helps with
All skin types
Watch for
None
Preservative
Badness
2.0 / 10
A common preservative that can be irritating for some individuals, especially at higher concentrations.
Usually helps with
Normal skin
Watch for
Potential for irritation and allergic reactions.
Colorant
Badness
2.0 / 10
A synthetic colorant that can cause allergic reactions in sensitive individuals.
Usually helps with
None
Watch for
Potential for allergic reactions and skin sensitivity.
Colorant
Badness
2.0 / 10
A synthetic colorant that can cause allergic reactions in sensitive individuals.
Usually helps with
None
Watch for
Potential for allergic reactions and skin sensitivity.
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FAQ
Yes, this serum is formulated to target redness and flushing, and it has received the National Rosacea Society Seal of Acceptance, indicating it's suitable for rosacea-prone skin.
It can be used with other acne treatments, but always introduce new products one at a time to monitor your skin's reaction. Azelaic acid can complement other acne-fighting ingredients.
Results can vary, but many users report seeing a reduction in redness within a few weeks of consistent use. Blemish reduction may also be observed over time.
