Formulation Adjustment: Addressing Odor and Texture

Based on your description and the previous reply, the metallic-like odor you are experiencing could indeed be related to Ethoxydiglycol, as this ingredient naturally has a characteristic odor. The sticky, slimy, or coating feeling is a common property of Hyaluronic Acid, particularly the larger molecular weight types like Hyaluronic Acid (Standard Molecule) or Hyaluronic Acid (Large Molecule), which are known to form gels and coat the skin surface. This texture is normal for formulations containing these types of Hyaluronic Acid at certain concentrations.

To improve your product and address these issues, here are some suggestions:

Reducing Stickiness

• Reduce Hyaluronic Acid Concentration: As suggested previously, lowering the percentage of Hyaluronic Acid in your formula is the most direct way to reduce stickiness and the coating feeling. Start by reducing the concentration gradually until you achieve a texture you prefer while still maintaining sufficient hydration.
• Consider Different Molecular Weights: If you are using Hyaluronic Acid (Standard Molecule) or Hyaluronic Acid (Large Molecule), consider incorporating or switching to Hyaluronic Acid (Small Molecule). The small molecule size is absorbed deeper into the skin and does not create a gel texture or coat the surface as much, which can result in a less sticky feel while still providing hydration.

Reducing Odor

• Check Ethoxydiglycol Grade: Ensure you are using a high-purity cosmetic grade of Ethoxydiglycol. Lower purity grades can have stronger or more unpleasant odors.
• Add Fragrance: The most common method to mask ingredient odors in cosmetics is to add a small amount of fragrance. If your formula is water-based, you may need a solubilizer like Flora Solve™ Clear to properly disperse the fragrance oil without making the product cloudy or unstable. Always use fragrances approved for cosmetic use and follow recommended usage rates.
• Consider Alternative Solvents/Carriers: If the odor of Ethoxydiglycol is problematic and adding fragrance is not desired, you might explore alternative solvents or carriers, although this would require significant reformulation and testing to ensure compatibility and performance.

Adjusting cosmetic formulations often requires trial and error. It is recommended to make small changes at a time and test the results until you achieve the desired texture and scent profile.