Here is a suggested approach for formulating a fast-absorbing, non-sticky, non-comedogenic serum to treat melasma, brighten skin, and reduce pores, including TXC.

Key Ingredients:

• TXC™ (Cetyl Tranexamate HCl): This is a key ingredient for targeting melasma and providing whitening effects. It is more easily absorbed into the skin than traditional Tranexamic Acid.
• Safe-B3™ (Vitamin B3, Niacinamide): Known for its multiple benefits, including brightening skin tone, reducing the appearance of pores, improving skin barrier function, and anti-inflammatory properties.
• Ascorbyl Glucoside (Stabilized Vitamin C): A stable derivative of Vitamin C that helps to brighten the skin, reduce dark spots, and provides antioxidant protection.

Formulation Approach:

A lightweight, water-based serum is ideal for a fast-absorbing, non-sticky feel.

1. Base: Use purified water as the main solvent. Add a humectant like Glycerin for hydration.
2. Thickener: Incorporate a suitable water-soluble thickener (e.g., Carbomer or Xanthan Gum) to achieve the desired serum viscosity without stickiness.
3. Active Ingredients:
   • TXC™: This ingredient is not water-soluble. It needs to be dissolved in a small amount of glycol (such as Propylene Glycol or Butylene Glycol) by heating to 60-80°C before being added to the water phase. Use TXC™ at a recommended rate of 1-2% for general whitening or 3-5% for spot treatment (note that higher concentrations can cause irritation).
   • Safe-B3™: Dissolve Niacinamide directly in the water phase. It is typically used at concentrations of 2-5% for pore reduction and brightening, and up to 10% for stronger effects.
   • Ascorbyl Glucoside: Dissolve Ascorbyl Glucoside in the water phase. Typical usage rates are 2-10%.
4. Finalizing: Add a broad-spectrum preservative system. Adjust the pH to a skin-friendly range (typically 5.0-6.0) for optimal stability and efficacy of the ingredients.

This combination of ingredients targets multiple concerns: TXC for melasma, Niacinamide and Ascorbyl Glucoside for brightening and pores, all within a lightweight serum base designed for quick absorption and a non-greasy feel.