Instability of mixture with Soy Extract, Pitera, and Hada Labo Lotion (Cloudiness, Crystals)

Hello, thank you for reaching out. The cloudy precipitate and small needle-shaped crystals you observed after mixing Pitera, Soy Extract, and Hada Labo lotion indicate that the mixture has become unstable.

There are several potential reasons for this:

• Solubility Limits: Ingredients, particularly the isoflavones in Soy Extract, can have limited solubility in water-based formulations. If the concentration of Soy Extract is too high relative to the solvent system provided by the Hada Labo lotion, the isoflavones may precipitate out and form crystals, which often appear needle-shaped.
• Incompatibility: The ingredients you added might be incompatible with each other or with the specific formulation of the Hada Labo lotion base. Adding extracts or other active ingredients can sometimes disrupt the stability of a pre-made product, potentially causing other components (like thickeners or preservatives in the Hada Labo base, or even the Hyaluronic Acid under certain conditions) to precipitate.
• Concentration: Using a high concentration of the added extracts relative to the base can exceed the formulation's capacity to keep everything dissolved and stable.
• Storage Conditions: Temperature fluctuations or improper storage could also contribute to instability and precipitation.

The staff has asked for your mixing ratio, storage method, and the lot number of the Soy Extract. This information is crucial because it helps pinpoint the exact cause of the instability. The ratio affects the final concentration of each ingredient, storage conditions can impact solubility, and the lot number can help check for any specific issues with that batch of Soy Extract.

Regarding whether you can still use it: When a cosmetic mixture shows signs of significant instability like precipitation and crystallization, it is generally not recommended to use it. The efficacy of the product may be compromised, and the precipitated crystals could potentially cause skin irritation.

Please provide the details requested by the staff so they can give you a more specific diagnosis and advice.