Circadia Vitamin C Reversal Serum

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.

We offer free shipping on every order $50+ (just $7 flat-rate below that). Orders placed before 1pm PST Monday through Friday ship out the same day. Orders placed outside of that window are shipped the very next day!

Changed your mind? We get it. That's why our return window is generous: 30 days even if you've opened and tried it, or a full 60 days if it's still sealed. Some exclusions apply. See our full return policy for details.