Circadia Vitamin C Reversal Antioxidant Serum 0.5 fl oz (15ml) - deep blue frosted glass dropper bottle

Circadia Vitamin C Reversal Antioxidant Serum texture swatch showing smooth lightweight white serum in a wavy ribbon consistency

Hand dispensing Circadia Vitamin C Reversal Antioxidant Serum from dropper bottle, a gentle brightening serum that firms, protects, and hydrates with stabilized vitamin C and soothing regenerative ingredients

Circadia Vitamin C Reversal Antioxidant Serum dropper bottle with key ingredients: Magnesium Ascorbyl Phosphate Stabilized Vitamin C to brighten and prevent collagen breakdown, Sodium Hyaluronate for deep hydration, and Panthenol Provitamin B5 to soothe and heal

Woman with bright even-toned skin showing Circadia Vitamin C Reversal Antioxidant Serum is best for all skin types, aging, dull and uneven tone, and sensitive skin

Five-star verified customer review for Circadia Vitamin C Reversal Antioxidant Serum praising its smooth lightweight texture that absorbs quickly without stickiness

Acne Safe

Circadia Vitamin C Reversal Serum

Name: Circadia Vitamin C Reversal Serum
Brand: Circadia
SKU: CIR007020

Circadia

A non-acidic vitamin C serum with 10% magnesium ascorbyl phosphate to brighten dark spots, protect against free radicals, and calm sensitive or acne-prone skin.

4.9

Rated 4.9 out of 5 stars

14 Reviews

Size: 0.5 oz

Earn points for this product!

Shipping calculated at checkout.

Circadia Vitamin C Reversal Serum is a professional-grade antioxidant serum built for skin types that have been left out of the traditional vitamin C conversation: sensitive, reactive, rosacea-prone, and acne-prone skin. While most vitamin C serums rely on L-ascorbic acid, an acidic form that oxidizes quickly and can cause stinging or redness, this formula delivers 10% magnesium ascorbyl phosphate (MAP), a stable, pH-neutral derivative that converts to active vitamin C once absorbed, giving you the real brightening and protective benefits without the inflammation risk. It is fragrance-free.
Key Benefits
Brightens uneven tone and fades post-acne marks Magnesium ascorbyl phosphate inhibits melanin synthesis at 10% concentration, helping to visibly reduce dark spots, post-inflammatory hyperpigmentation, and dullness over consistent use.
Antioxidant protection that holds up all day Unlike L-ascorbic acid, MAP is photostable and resistant to oxidation, meaning it stays active in the bottle and on the skin, neutralizing free radicals from UV exposure and environmental pollution.
Supports collagen and skin firmness Vitamin C is a required co-factor in collagen synthesis. MAP delivers this benefit in a form the skin can convert and use, helping to maintain elasticity and reduce the appearance of fine lines over time.
Draws and seals moisture into the skin Sodium hyaluronate, the low-molecular-weight form of hyaluronic acid, penetrates below the surface to attract and hold water where the skin needs it most, supporting a plump, comfortable feel throughout the day.
Soothes and reinforces the skin barrier Panthenol (provitamin B5) calms irritation, reduces redness, and supports the skin's natural repair process, making this serum appropriate even for compromised or sensitized skin.
If your skin has ever reacted to a vitamin C serum with redness, stinging, or breakouts, this formula was designed with you in mind. Circadia Vitamin C Reversal Serum is ideal for sensitive, reactive, and rosacea-prone skin types that need the antioxidant and brightening benefits of vitamin C without the irritation that typically comes with acidic formulations.
It is also well-suited for anyone managing post-acne dark spots or uneven skin tone. Because it is non-comedogenic and pH-neutral, it works alongside acne-prone skin rather than against it, reducing discoloration without triggering congestion or inflammation.
This serum fits naturally into a morning routine for anyone who wants reliable environmental protection and a more even complexion over time. It layers well under moisturizer and sunscreen, and its stable formula means every drop delivers consistent results.
Apply this serum to skin that is still slightly damp after toning. Magnesium ascorbyl phosphate absorbs more efficiently into hydrated skin, and the added moisture helps sodium hyaluronate lock in even more water before you seal everything in with your moisturizer.
Prepare: Cleanse and tone as usual.
Apply: Dispense several drops into your fingertips and press gently into slightly damp face, neck, and chest.
Technique: Allow approximately 60 seconds for the serum to absorb fully before layering additional products.
Frequency: Use each morning for consistent antioxidant protection. Follow with moisturizer and a broad-spectrum SPF.
Key Ingredients

Vitamin C (MAP): One of the most gentle, stable, water-soluble forms of vitamin C, safe for dry and sensitive skin types. Has a slower release into the body, providing more sustained brightening and antioxidant benefits.
Sodium Hyaluronate: The purest, salt form of hyaluronic acid, a master humectant that holds up to 1,000 times its weight in water to provide maximum hydration and plumping benefits to thirsty skin.
Panthenol (Vitamin B5): A powerful natural moisturizer, healer, and protector that rebuilds the barrier and acts as a shield against irritation.

Aqua/Water, Magnesium Ascorbyl Phosphate, Pentylene Glycol, Sodium Hyaluronate, Panthenol, Caprylyl Glycol, Phenoxyethanol, Hexylene Glycol.
How is Circadia Vitamin C Reversal Serum different from other vitamin C serums?

Most vitamin C serums use L-ascorbic acid, which is acidic, oxidizes quickly, and can cause stinging, redness, or breakouts in sensitive skin. Circadia Vitamin C Reversal Serum uses magnesium ascorbyl phosphate (MAP) at 10%, a stable, pH-neutral derivative that converts to active vitamin C after absorption. This means you get the same brightening, antioxidant, and collagen-supporting benefits without the irritation or instability associated with traditional formulas.

Is Circadia Vitamin C Reversal Serum safe for sensitive skin?

Yes. The formula is built specifically for sensitive and reactive skin. Magnesium ascorbyl phosphate is non-acidic and pH-neutral, so it delivers antioxidant and brightening benefits without the burning or inflammation that acidic vitamin C products often cause. Panthenol also helps calm and reinforce a compromised skin barrier, adding an extra layer of gentleness to the formula.

Is Circadia Vitamin C Reversal Serum safe for acne-prone skin?

Yes. Circadia Vitamin C Reversal Serum is non-comedogenic and will not clog pores or trigger breakouts. Because it uses magnesium ascorbyl phosphate rather than an acidic form of vitamin C, it helps calm inflammation and fade post-acne marks without the risk of congestion or irritation that can come with harsh actives.

Will Circadia Vitamin C Reversal Serum oxidize or lose its effectiveness over time?

No. Magnesium ascorbyl phosphate is significantly more stable than L-ascorbic acid and is resistant to oxidation from air and light exposure. Traditional vitamin C serums often turn yellow or brown as they degrade, but MAP maintains its potency and stays clear, so the formula remains effective from the first use to the last.

Does Circadia Vitamin C Reversal Serum cause skin purging?

No. This serum does not accelerate cell turnover the way retinol or exfoliating acids do, so purging is not a concern. It works by providing antioxidant protection, supporting collagen, and brightening the skin, none of which involve the kind of cellular disruption that triggers a purge response.

Can Circadia Vitamin C Reversal Serum be used alongside retinol?

Yes, and this is actually a well-paired combination. Use Circadia Vitamin C Reversal Serum in the morning to defend against environmental free radical damage, and apply any retinol product at night to support cellular renewal. The two work on different mechanisms and different timeframes, so using them at separate times maximizes results without increasing sensitivity.

Can Circadia Vitamin C Reversal Serum be layered with exfoliating acids like AHAs or BHAs?

Yes. Because Circadia Vitamin C Reversal Serum is pH-neutral, it does not compete with or destabilize exfoliating acids the way L-ascorbic acid can. For sensitive skin, it is still a good practice to use exfoliating acids on alternate evenings rather than stacking multiple actives at once, but there is no chemical conflict with this particular formula.

Why buy Circadia Vitamin C Reversal Serum from Art of Skin Care?

Art of Skin Care is an authorized retailer of Circadia, so every product you receive is 100% authentic, sourced directly through official brand channels and never from third-party resellers. Our team is made up of licensed, acne-certified estheticians who hand-select the products we carry based on real skin science and professional results. We don't just sell skincare; we understand it. Not sure if Circadia Vitamin C Reversal Serum is right for your skin? Get a free skincare consultation and one of our estheticians will personally guide you.

How long does it take to see results from Circadia Vitamin C Reversal Serum?

Improved hydration and radiance can appear within days. Visible brightening, reduction in dark spots, and improved firmness typically develop after 4–8 weeks of consistent daily use.

Learn More

Circadia Vitamin C Reversal Serum is a professional-grade antioxidant serum built for skin types that have been left out of the traditional vitamin C conversation: sensitive, reactive, rosacea-prone, and acne-prone skin. While most vitamin C serums rely on L-ascorbic acid, an acidic form that oxidizes quickly and can cause stinging or redness, this formula delivers 10% magnesium ascorbyl phosphate (MAP), a stable, pH-neutral derivative that converts to active vitamin C once absorbed, giving you the real brightening and protective benefits without the inflammation risk. It is fragrance-free.

Key Benefits

Brightens uneven tone and fades post-acne marks Magnesium ascorbyl phosphate inhibits melanin synthesis at 10% concentration, helping to visibly reduce dark spots, post-inflammatory hyperpigmentation, and dullness over consistent use.

Antioxidant protection that holds up all day Unlike L-ascorbic acid, MAP is photostable and resistant to oxidation, meaning it stays active in the bottle and on the skin, neutralizing free radicals from UV exposure and environmental pollution.

Supports collagen and skin firmness Vitamin C is a required co-factor in collagen synthesis. MAP delivers this benefit in a form the skin can convert and use, helping to maintain elasticity and reduce the appearance of fine lines over time.

Draws and seals moisture into the skin Sodium hyaluronate, the low-molecular-weight form of hyaluronic acid, penetrates below the surface to attract and hold water where the skin needs it most, supporting a plump, comfortable feel throughout the day.

Soothes and reinforces the skin barrier Panthenol (provitamin B5) calms irritation, reduces redness, and supports the skin's natural repair process, making this serum appropriate even for compromised or sensitized skin.

Who it's For

Esthetician Recommendations

How to Use

Ingredients

Frequently Asked Questions

How is Circadia Vitamin C Reversal Serum different from other vitamin C serums?

Most vitamin C serums use L-ascorbic acid, which is acidic, oxidizes quickly, and can cause stinging, redness, or breakouts in sensitive skin. Circadia Vitamin C Reversal Serum uses magnesium ascorbyl phosphate (MAP) at 10%, a stable, pH-neutral derivative that converts to active vitamin C after absorption. This means you get the same brightening, antioxidant, and collagen-supporting benefits without the irritation or instability associated with traditional formulas.

Is Circadia Vitamin C Reversal Serum safe for sensitive skin?

Yes. The formula is built specifically for sensitive and reactive skin. Magnesium ascorbyl phosphate is non-acidic and pH-neutral, so it delivers antioxidant and brightening benefits without the burning or inflammation that acidic vitamin C products often cause. Panthenol also helps calm and reinforce a compromised skin barrier, adding an extra layer of gentleness to the formula.

Is Circadia Vitamin C Reversal Serum safe for acne-prone skin?

Yes. Circadia Vitamin C Reversal Serum is non-comedogenic and will not clog pores or trigger breakouts. Because it uses magnesium ascorbyl phosphate rather than an acidic form of vitamin C, it helps calm inflammation and fade post-acne marks without the risk of congestion or irritation that can come with harsh actives.

Will Circadia Vitamin C Reversal Serum oxidize or lose its effectiveness over time?

No. Magnesium ascorbyl phosphate is significantly more stable than L-ascorbic acid and is resistant to oxidation from air and light exposure. Traditional vitamin C serums often turn yellow or brown as they degrade, but MAP maintains its potency and stays clear, so the formula remains effective from the first use to the last.

Does Circadia Vitamin C Reversal Serum cause skin purging?

No. This serum does not accelerate cell turnover the way retinol or exfoliating acids do, so purging is not a concern. It works by providing antioxidant protection, supporting collagen, and brightening the skin, none of which involve the kind of cellular disruption that triggers a purge response.

Can Circadia Vitamin C Reversal Serum be used alongside retinol?

Yes, and this is actually a well-paired combination. Use Circadia Vitamin C Reversal Serum in the morning to defend against environmental free radical damage, and apply any retinol product at night to support cellular renewal. The two work on different mechanisms and different timeframes, so using them at separate times maximizes results without increasing sensitivity.

Can Circadia Vitamin C Reversal Serum be layered with exfoliating acids like AHAs or BHAs?

Yes. Because Circadia Vitamin C Reversal Serum is pH-neutral, it does not compete with or destabilize exfoliating acids the way L-ascorbic acid can. For sensitive skin, it is still a good practice to use exfoliating acids on alternate evenings rather than stacking multiple actives at once, but there is no chemical conflict with this particular formula.

Why buy Circadia Vitamin C Reversal Serum from Art of Skin Care?

Art of Skin Care is an authorized retailer of Circadia, so every product you receive is 100% authentic, sourced directly through official brand channels and never from third-party resellers. Our team is made up of licensed, acne-certified estheticians who hand-select the products we carry based on real skin science and professional results. We don't just sell skincare; we understand it. Not sure if Circadia Vitamin C Reversal Serum is right for your skin? Get a free skincare consultation and one of our estheticians will personally guide you.

How long does it take to see results from Circadia Vitamin C Reversal Serum?

Improved hydration and radiance can appear within days. Visible brightening, reduction in dark spots, and improved firmness typically develop after 4–8 weeks of consistent daily use.