Description

What is Hexylresorcinol?

Hexylresorcinol — also written as 4-hexylresorcinol,CAS 136-77-6 — is a source-level melanin control active supplied as a white to off-white crystalline powder. It is a C-alkylated resorcinol , assayed at ≥ 99.0 % .

Most brightening actives act on the surface of the pigmentation process. Hexylresorcinol acts at its origin: it inhibits tyrosinase and the other rate-limiting steps of melanin synthesis, and it also interferes with the transfer of melanosomes from melanocytes to keratinocytes. Because it is active at only 0.2–0.5 %, it delivers a visible even-tone result without the irritation and cytotoxicity concerns associated with hydroquinone.

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Key Benefits

• Source-level melanin control. It inhibits tyrosinase at the start of the melanin pathway and reduces melanosome transfer, so the activity targets hyperpigmentation where it is generated instead of where it becomes visible.
• Boosts niacinamide. The two actives work on complementary steps of the same pathway; formulated together they deliver a stronger, more even brightening result than either ingredient alone.
• Effective at 0.2–0.5 %. Activity at very low addition keeps both the ingredient cost and the burden on the rest of the formula low.
• Gentle and reassuring. Well tolerated at use levels, without the irritation, phototoxicity or cytotoxicity profile that limits hydroquinone — suitable for daily leave-on products and for sensitive-skin positioning.
• Skin repair support. Beyond pigmentation it works as an antioxidant, helps protect cell DNA under UV exposure, inhibits non-enzymatic glycation and modulates the NF-κB inflammatory pathway.
• Easy to formulate. Amphiphilic and readily soluble in polar solvents and glycols, it can be added to aqueous serums, anhydrous serums or an emulsion oil phase without a dedicated delivery system.
• Photochemically stable. It does not need the light protection or pH control that vitamin C and arbutin derivatives demand.

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FAQ

• What use level do you recommend? 0.2–0.5 %. Confirm the final level against the permitted use level and any claim restrictions in the target market before finalising the label.

• Can Hexylresorcinol be combined with niacinamide? Yes, and it is worth doing. The two actives interfere with different steps of the melanin pathway, and the combination is widely used in commercial brightening products for a stronger effect than either alone.

• How is it different from hydroquinone or alpha-arbutin? It controls pigmentation at the source by inhibiting tyrosinase and melanosome transfer, but without the irritation, phototoxicity and cytotoxicity concerns that restrict hydroquinone. It is also active at a much lower addition than most arbutin derivatives and needs no pH or light protection.

• How should it be added to a formula? Pre-dissolve it in a polar solvent such as propylene glycol, PEG-8 or caprylic/capric triglyceride. Add it to the oil phase of an emulsion, or post-emulsification at 40 °C or below. Store the finished product in a sealed container away from light and heat; no pH adjustment is required.