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Cosmedix Elite DUO-A 1% Nightly Retinoid Treatment is a high-performance serum that targets signs of ageing while supporting your skin barrier.
Powered by a dual-retinoid blend of Retinal and Retinol, it encourages smoother, firmer skin and a more even tone. This potent night treatment reduces the look of fine lines and wrinkles while enhancing skin texture over time.
Its advanced formula combines fast-acting Retinal with time-released Retinol for optimal results without overwhelming the skin. Hydrating agents work alongside to maintain moisture and barrier integrity.
Ideal for retinoid users looking to step up their routine or prepare for in-clinic treatments.
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Directions
How To Use Cosmedix Elite Duo-A 1% Nightly Retinoid Treatment
Apply a pea-sized amount to clean, dry skin at night, avoiding the eye area.
Begin using 1-3 times per week, gradually increasing frequency as your skin adjusts.
Always follow with moisturizer and use sunscreen during daytime hours.
The water base that carries and dissolves the other ingredients in most products.
May suit
All hair and skin types.
Worth knowing
Almost always the first ingredient listed in water-based products.
GlycerinHumectants
Humectant
Attracts and holds water to help hair feel hydrated and soft.
May suit
Dry or dehydrated hair, and many curl and moisture routines.
Worth knowing
A very common, well-tolerated humectant used across countless products.
Jojoba Seed OilOils and butters
Emollient oil
A lightweight plant oil that helps condition and soften the hair.
May suit
Those seeking smoother, more manageable hair or added moisture without heaviness.
Worth knowing
Jojoba oil is structurally similar to natural scalp oils, which makes it versatile in many haircare formulas. It is commonly used to enhance softness and shine.
Beta-GlucanHumectants
Moisturising humectant
Helps attract and retain moisture while supporting a smoother, conditioned feel.
May suit
People with dry, damaged or sensitised hair and scalp may appreciate its soothing, hydrating benefits.
Worth knowing
Beta-glucan is a naturally occurring polysaccharide often derived from oats or fungi and is valued for its calming and hydrating properties. It can also contribute light film-forming benefits that support softness.
Stearyl AlcoholConditioning agents
Emollient and thickener
A fatty alcohol that helps soften the hair and give products a smooth, creamy texture.
May suit
People looking for conditioners or treatments that provide slip, softness and richer textures.
Worth knowing
Although called an alcohol, it is a waxy, non‑drying fatty alcohol commonly used to enhance conditioning performance and product stability.
Cetyl AlcoholConditioning agents
Emollient and texture enhancer
Cetyl Alcohol helps soften the hair and gives products a smooth, creamy texture.
May suit
Those looking for conditioning, slip, or richer textures in their haircare products.
Worth knowing
Despite the name, fatty alcohols like cetyl alcohol are non‑drying and are commonly used to add emollience and stability to formulations.
Tocopheryl AcetateConditioning agents
Antioxidant and conditioning support
A stable form of vitamin E used to help condition hair and support product stability.
May suit
Those looking for added conditioning support or antioxidant benefits in their haircare.
Worth knowing
It is commonly used because it is more stable than pure vitamin E while still offering similar benefits. It appears in many leave-in and rinse-off formulations.
Theobroma Cacao Seed ButterOils and butters
Emollient butter
A rich plant butter that helps condition and soften the hair.
May suit
Those seeking added smoothness, softness or moisture in dry or coarse hair types.
Worth knowing
It creates a protective, buttery coating that can help reduce moisture loss and enhance manageability. Often used in nourishing and restorative treatments.
Butyrospermum Parkii ButterOils and butters
Conditioning butter
A rich butter that softens and conditions, adding slip to dry or coarse hair.
May suit
Dry, coarse, curly or thick hair wanting extra softness.
Worth knowing
Rich and nourishing, so amounts can be adjusted to hair type.
PanthenolConditioning agents
Conditioning agent
Helps condition, soften and add a smooth, healthy feel to the hair.
May suit
Most hair types, especially dry or dull hair.
Worth knowing
A versatile, well-tolerated conditioning ingredient.
BisabololBotanical extracts
Soothing botanical component
Bisabolol is a calming component often used to help soothe the scalp and support comfortable wear of hair products.
May suit
Those with a sensitive or easily irritated scalp may appreciate its calming properties.
Worth knowing
It is commonly derived from chamomile or produced synthetically with similar benefits. It is widely used in both skincare and haircare for its gentle, comforting profile.
Potassium Cetyl PhosphateCleansers / surfactants
Emulsifying surfactant
Helps mix oil‑ and water‑based ingredients and provides mild cleansing action.
May suit
Those who prefer formulas that feel lightweight and spread easily.
Worth knowing
It is commonly used as an emulsifier to stabilise creams and conditioners without adding heaviness. Its mild surfactant properties can also support product texture and rinseability.
RetinolAnti-dandruff / scalp care
Vitamin A derivative
Retinol is a form of vitamin A used in some scalp‑care formulas to support healthy skin renewal.
May suit
People interested in targeted scalp treatments or products aimed at improving scalp texture and turnover.
Worth knowing
Retinol is more common in skincare than haircare, but small amounts may be included in specialised scalp products. It is typically formulated at low levels to help maintain comfort and balance.
RetinaldehydeConditioning agents
Renewing antioxidant
A vitamin A derivative used to support scalp and hair fibre renewal.
May suit
Those interested in targeted scalp-care or antioxidant-focused treatments.
Worth knowing
Retinaldehyde is less common in haircare than in skincare but can be included for its gentle renewing and antioxidant properties. Formulators typically use it in low concentrations to maintain comfort and stability.
Aloe Barbadensis Leaf ExtractBotanical extracts
Soothing botanical extract
Aloe vera extract helps hydrate and soothe the hair and scalp.
May suit
Those looking for lightweight hydration or gentle scalp comfort.
Worth knowing
Aloe extracts are widely used for their moisturising and calming properties in both hair and skin products.
Caesalpinia Spinosa GumThickeners and stabilisers
Natural thickener
A plant-derived gum used to thicken and stabilise haircare formulations.
May suit
Those who prefer products using plant-derived texture enhancers.
Worth knowing
It helps create a smooth, uniform texture and can improve the feel of conditioners, masks and styling products. It is commonly used as a natural alternative to synthetic thickeners.
AllantoinConditioning agents
Scalp‑soothing conditioner
Allantoin helps soothe the scalp and condition the hair and skin.
May suit
Those with a sensitive or easily irritated scalp may appreciate its calming effect.
Worth knowing
It is widely used in personal care for its comforting feel and compatibility with many formulas. In haircare, it supports a smoother, more comfortable scalp experience.
TocopherolPreservatives
Antioxidant
An antioxidant that helps support product stability and can provide conditioning benefits to hair.
May suit
Those wanting added nourishment or antioxidant support in their haircare routine.
Worth knowing
Tocopherol is commonly included to help protect oils in a formula from oxidising and to offer light conditioning benefits. It is widely used in both skincare and haircare products.
CelluloseThickeners and stabilisers
Viscosity controller
Helps thicken and stabilise haircare formulas for a smoother application.
May suit
Those who prefer products with plant-derived structuring ingredients.
Worth knowing
Cellulose is a natural polymer typically sourced from plants and is widely used to improve texture and consistency in many cosmetic products.
Dipotassium GlycyrrhizateBotanical extracts
Soothing botanical derivative
Helps soothe and condition the scalp and hair.
May suit
Those with a sensitive or easily irritated scalp.
Worth knowing
Derived from liquorice root, it is often used to help calm the scalp and support comfortable product use. It can complement other conditioning or scalp‑care ingredients.
Polysorbate 20Thickeners and stabilisers
Solubiliser / emulsifier
Helps blend oil‑based ingredients into water‑based formulas for a smooth, even texture.
May suit
Those using products with essential oils or fragranced blends, as it helps disperse these evenly.
Worth knowing
It is widely used as a gentle solubiliser in both leave‑in and rinse‑off products. Its presence can improve product consistency and prevent ingredient separation.
PhenoxyethanolPreservatives
Preservative
Helps keep the product stable and pleasant to use after opening.
May suit
All products that need protecting from spoilage.
Worth knowing
A very common, well-studied preservative used at low levels.
EthylhexylglycerinPreservatives
Preservative booster
Helps support the preservation system and can provide mild skin-conditioning benefits.
May suit
Those interested in gentle preservation systems or sensitive scalps may find it relevant.
Worth knowing
It is often paired with other preservatives to improve their effectiveness while allowing for lower usage levels. It also has light moisturising and conditioning properties.