Serum Formula Adjustment for Texture Improvement

Based on the serum formula you created and the texture issues you are experiencing (stickiness and pilling), it is likely due to the combination of a high concentration of active ingredients, the amount of thickener (Xanthan Gum), and the penetration enhancer (Laurocapram).

To improve the texture and reduce stickiness and pilling while keeping the beneficial ingredients, I recommend slightly adjusting the percentages of Xanthan Gum and Laurocapram.

Here is a suggested adjusted formula:

• GlucoBright (Acetyl glucosamine) 4%
• Safe-B3 (Niacinamide) 5%
• Matrixyl 3000 8%
• Rice Vitamin (Inositol) 2%
• Laurocapram (Water Soluble) 1% (Reduced from 2%)
• Panthenol 1%
• Xanthan Gum (clear gel type, smooth texture) 0.5% (Reduced from 1%)
• Lavender Water 78.5% (Increased to make up the difference)

Total: 100%

By reducing the Xanthan Gum, the serum will have a lighter gel consistency, which helps minimize pilling. Reducing Laurocapram may also improve the overall skin feel and reduce stickiness.

Crucial Addition: Preservative

Your current formula does not include a preservative. Any water-based product like this serum must contain a broad-spectrum preservative to prevent the growth of bacteria, mold, and yeast. Using a product without a preservative can be harmful to your skin and cause the product to spoil quickly. Please add a suitable preservative according to the supplier's recommended usage rate.

Mixing Instructions for the Adjusted Formula (including a preservative):

1. Weigh the Lavender Water into a clean, sanitized container.
2. Slowly sprinkle the Xanthan Gum (0.5%) over the surface of the water while stirring continuously. Stir well until the Xanthan Gum is completely dispersed and the mixture thickens into a clear, smooth gel. Using a mini-mixer can help achieve a lump-free gel faster. Allow it to hydrate fully (usually 15-30 minutes) before proceeding.
3. In a separate container, weigh your chosen broad-spectrum preservative.
4. Add GlucoBright (4%), Safe-B3 (5%), Matrixyl 3000 (8%), Rice Vitamin (2%), and Panthenol (1%) to the Xanthan Gum gel base. Stir thoroughly until all powders are completely dissolved and the mixture is clear and uniform. Gentle warming in a water bath can assist dissolution if needed, but avoid high temperatures.
5. Add Laurocapram (1%) to the mixture and stir until fully incorporated.
6. Add the preservative to the serum and stir to ensure it is evenly distributed.
7. Check the pH of the final serum. The optimal pH range for most skin serums is typically between 5.0 and 6.0. Adjust the pH if necessary using a dilute acid (like Lactic Acid or Citric Acid solution) or a dilute base (like Sodium Hydroxide solution), adding drop by drop and checking the pH after each addition.
8. Transfer the finished serum to a clean, sanitized bottle.

This adjusted formula and the essential addition of a preservative should provide a more comfortable texture while delivering the desired benefits for hydration, reducing dark spots, and addressing fine lines.