Editor’s update (May 2026): Shira still makes the Glyco-C Mask reviewed here, alongside the rest of its dermatology-grade range. The current Shira skincare on Amazon is where to find it.
Glycolic acid and vitamin C are two of skincare’s most reliable workhorses, and Shira built an entire professional line — Glyco-C — around pairing them. The Glyco-C Mask packages that combination into a treatment step, and the esthetician-favoured brand is still going strong in 2026.
What Shira’s Glyco-C line is
Shira (Shira Esthetics) is a professional skincare brand favoured by estheticians, and Glyco-C is its hero collection. The premise is synergy: glycolic acid to exfoliate and resurface, vitamin C to brighten and protect, delivered together through a nano-sphere system designed to carry the actives into the skin more effectively. The line spans serums, creams, toners and treatments aimed at wrinkles, acne and hyperpigmentation, and the Glyco-C Mask is the concentrated, do-it-in-one-step treatment within that family.
What the Glyco-C Mask does
The mask is a treatment you leave on for a set time to give skin a concentrated dose of the glycolic-and-vitamin-C combination. Glycolic acid loosens the bonds between dull, dead surface cells so they slough away, revealing smoother, brighter skin underneath, while vitamin C works on tone, radiance and antioxidant protection. The result, used regularly, is the kind of polished, even, lit-from-within look that a good professional facial gives — which makes sense, given the brand’s roots in the treatment room.
Why the glycolic-plus-vitamin-C combination works
These two actives complement each other neatly. Glycolic acid resurfaces and, in doing so, helps the vitamin C penetrate and work more effectively; vitamin C, in turn, brightens and helps defend the freshly exfoliated skin against environmental damage. Used together, they tackle dullness, uneven tone and rough texture from two angles at once. Pairing them in a single mask is a tidy way to get that one-two effect without layering multiple products and risking over-application.
Who it’s really for
The Glyco-C Mask suits skin that looks dull, congested, uneven in tone or rough in texture, and anyone wanting professional-grade results at home. It’s a good fit if you’ve enjoyed glycolic facials and want to extend the effect between appointments. Because it’s an exfoliating acid treatment, it’s less suited to very sensitive or compromised skin without caution — patch-test first, start with shorter contact times, and don’t combine it with other strong exfoliants on the same day.
How to use it
Use the mask as a periodic treatment — typically once or twice a week rather than daily — applied to clean skin and left on for the recommended time before rinsing. Because glycolic acid increases sun sensitivity, follow with daily broad-spectrum sunscreen, and ideally use the mask in your evening routine. Ease in if you’re new to acids: start once a week, see how your skin responds, and build from there. Don’t stack it with retinoids or other peels on the same night.
Is it worth it, and where to buy
For a professional-grade glycolic-and-vitamin-C treatment you can use at home, the Glyco-C Mask is a solid, results-minded option from a line estheticians trust. You can buy it direct from shiraesthetics.com, and selected Glyco-C products are also available on Amazon and through professional skincare suppliers. If brightening and smoothing are your goals, it’s an efficient way to get both in one step.
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Frequently asked questions
Is Shira Glyco-C still sold in 2026?
Yes. Shira’s Glyco-C line is still available in 2026, direct from shiraesthetics.com and through Amazon and professional skincare suppliers such as California Skincare Supply.
What does the Glyco-C Mask do?
It delivers a concentrated dose of glycolic acid and vitamin C to exfoliate, brighten and smooth the skin — addressing dullness, uneven tone and rough texture in a single leave-on treatment step.
Why combine glycolic acid and vitamin C?
They complement each other: glycolic acid resurfaces and helps the vitamin C penetrate, while vitamin C brightens and protects the freshly exfoliated skin. Together they tackle dullness and uneven tone from two angles.
How often should I use the Glyco-C Mask?
Typically once or twice a week, not daily. Start with once a week if you’re new to acids, always follow with daily sunscreen, and avoid combining it with other strong exfoliants or retinoids on the same day.