Adding Mandelic Acid and Ethyl Panthenol to HADA LABO Lotion

Based on the ingredients you provided for the HADA LABO Super Hyaluronic Acid Moisturizing Lotion and the properties of Mandelic Acid and Ethyl Panthenol, here's an analysis of whether you can add them:

• Mandelic Acid: This is an Alpha Hydroxy Acid (AHA) known for its exfoliating and anti-bacterial properties, making it beneficial for acne-prone skin. Mandelic Acid is water-soluble. However, AHAs like Mandelic Acid are most effective and stable in formulations with a low pH, typically below 3.5 for consumer products containing up to 10% Mandelic Acid (as per FDA guidelines). It should be mixed into the water phase and kept below 60°C during formulation.

• Ethyl Panthenol (Vitamin B5): This is a water-soluble form of Vitamin B5 that acts as a humectant and moisturizer, helps strengthen the skin barrier, reduces inflammation, and aids in wound healing. Ethyl Panthenol is most effective in a pH range of 4.0-7.0. It is also mixed into the water phase.

Compatibility Considerations:

The main challenge in adding both Mandelic Acid and Ethyl Panthenol to your existing HADA LABO lotion lies in their optimal pH requirements. The HADA LABO lotion is likely formulated to a specific pH that is compatible with its ingredients, particularly the different types of Hyaluronic Acid (typically around pH 5.5-6.5).

• Adding Mandelic Acid would require lowering the pH significantly (ideally below 3.5) for it to be effective and stable as an exfoliant.
• This low pH is outside the optimal range for Ethyl Panthenol (pH 4.0-7.0) and could potentially reduce its efficacy or stability.
• Furthermore, drastically changing the pH of a finished commercial product can destabilize the entire formulation, affecting the stability and performance of the original ingredients (like the Hyaluronic Acids, thickeners, and preservatives) and potentially altering the texture or causing separation.

Conclusion:

While both Mandelic Acid and Ethyl Panthenol are water-soluble and could theoretically be mixed into a water-based product, adding them to a pre-formulated product like the HADA LABO lotion is not recommended due to the conflicting optimal pH ranges of Mandelic Acid and Ethyl Panthenol, and the risk of destabilizing the original lotion's carefully balanced formula.

If you wish to use these ingredients together, it would be best to formulate a new product from scratch where you can control the pH and ensure compatibility and stability of all components.