✨ A targeted brightening serum from CIRCADIA built around multi-pathway tyrosinase inhibition — formulated for estheticians managing hyperpigmentation, melasma, and post-pregnancy discoloration in facial treatment protocols.

🧪 At its core, oil-soluble Tetrahexyldecyl Ascorbate (BV-OSC) delivers a more oxidatively stable vitamin C than traditional water-soluble forms, working alongside Phenylethyl Resorcinol (SymWhite) and a botanical extract complex to interrupt melanin production from multiple upstream and direct inhibition points. Trans-resveratrol (ReguFade) adds antioxidant reinforcement that addresses oxidative triggers — not just visible pigmentation after the fact. Glycerin keeps the skin barrier conditioned and receptive throughout the brightening protocol.

The serum's precision-dose, targeted-application design makes it a natural retail-to-treatment bridge — reinforcing in-clinic brightening work with a take-home regimen clients can pair with daily SPF.

A strong fit for practices running pigmentation correction protocols where client compliance between sessions is the deciding factor.

• Visibly reduces the appearance of hyperpigmentation and dark spots: The combined action of Tetrahexyldecyl Ascorbate and Phenylethyl Resorcinol (SymWhite) targets the tyrosinase enzyme at multiple points, helping to slow melanin production and progressively lighten the visible appearance of age spots, sun spots, and areas of uneven pigmentation with consistent use.
• Targets melasma and post-pregnancy discoloration: The multi-pathway tyrosinase-inhibition strategy — combining oil-soluble vitamin C (Tetrahexyldecyl Ascorbate), Phenylethyl Resorcinol, and Rumex Occidentalis Extract (Tyrostat-11) — addresses the overactive melanin production associated with hormonal and sun-related pigmentation conditions, helping to improve the appearance of melasma and post-pregnancy discoloration.
• Antioxidant defense against oxidative pigmentation triggers: Resveratrol (ReguFade, trans-resveratrol form) and Marrubium Vulgare Meristem Cell Culture contribute antioxidant activity that helps neutralize free radical signals linked to melanin overproduction, providing a complementary upstream defense alongside the formula's direct tyrosinase inhibitors.
• Brightens overall skin tone with a stable vitamin C delivery system: Tetrahexyldecyl Ascorbate's oil-soluble, ester-based chemistry offers greater oxidative stability than water-soluble vitamin C forms, allowing reliable and consistent brightening performance across the product's shelf life and after opening.
• Hydrates and softens while treating discoloration: Glycerin maintains skin-surface hydration during the brightening protocol, helping to keep the skin soft and conditioned. This dual action supports a more comfortable experience and ensures the skin barrier remains receptive to the active brightening ingredients.

Tetrahexyldecyl Ascorbate - known as BV-OSC (Oil-Soluble Vitamin C Ester): An oil-soluble, highly stable ester form of vitamin C that penetrates the lipid-rich layers of the skin more effectively than water-soluble ascorbic acid. Helps inhibit melanin synthesis by interfering with the tyrosinase enzyme pathway, supporting a brighter and more even-looking complexion. Its stability in formulation makes it particularly reliable compared to traditional vitamin C.

Phenylethyl Resorcinol - known as SymWhite (Tyrosinase Inhibitor): A resorcinol-derived compound and one of the most studied non-hydroquinone tyrosinase inhibitors in professional cosmetic brightening formulations. Works by blocking the enzyme responsible for converting tyrosine into melanin, helping to visibly lighten areas of hyperpigmentation and improve overall skin clarity. Also contributes antioxidant activity to the formula.

Resveratrol - known as ReguFade (Trans-Resveratrol): A naturally derived stilbene polyphenol used in its trans-resveratrol form, which is the biologically active configuration. Functions as a potent antioxidant that helps neutralize the oxidative signals that can trigger excess melanin production, providing a complementary upstream defense alongside the formula's direct tyrosinase inhibitors. Adds a brand-differentiating antioxidant-brightening dimension to the serum.

Rumex Occidentalis Extract - known as Tyrostat-11 (Botanical Tyrosinase Inhibitor): A standardized extract from Western Dock (Rumex Occidentalis) used as the trademarked Tyrostat-11 ingredient. Provides botanical tyrosinase-inhibiting activity that complements the formula's synthetic tyrosinase inhibitors, helping to further slow the appearance of age spots and uneven skin tone from pigmentation.

Marrubium Vulgare Meristem Cell Culture - known as Marrubium Plant Stem Cell Extract: A plant stem cell–derived extract from Marrubium Vulgare (White Horehound), standardized for its phenylpropanoid content — notably forsythoside B and verbascoside. These compounds contribute antioxidant activity to the formula, helping to defend the skin surface against oxidative stress that can contribute to uneven pigmentation over time.

Glycerin: A multifunctional humectant that draws moisture to the skin surface, helping maintain hydration and supporting a soft, smooth texture. At its concentration above the 1% line, it provides meaningful skin-surface hydration that complements the brightening actives by keeping the skin barrier conditioned and receptive.

1. Use in the evening, following the client's cleansing and toning steps.
2. Dispense one drop of the serum onto a fingertip.
3. Apply the serum directly to the affected areas of concern — age spots, sun spots, areas of melasma, or uneven pigmentation — using gentle, precise placement.
4. Avoid contact with the eye area and mucous membranes.
5. Allow the serum to absorb fully before applying any follow-up products such as moisturizer or SPF (if used in a morning alternative protocol).
6. For optimal results, follow with a broad-spectrum SPF product in the morning to protect treated areas from UV-induced re-pigmentation.

Protocol and retail integration tips

This serum is designed for targeted spot application, not all-over facial use — instruct clients to apply only to discolored areas to concentrate the active load where it is needed. For clients with active melasma or post-pregnancy hyperpigmentation, emphasize that consistent evening use combined with diligent daily SPF is essential; brightening actives cannot compete with ongoing UV stimulation of melanocytes. This is a strong retail conversion moment: position the serum as the in-clinic protocol's take-home continuation, pairing it with a matching SPF or a barrier-support moisturizer from the CIRCADIA line to reinforce the full regimen and increase client compliance.