Combining AHA and Hyaluronic Acid, and Addressing Foam in Serum

Here are the answers to your questions:

1. Can AHA be used with Hyaluronic Acid in the same formula?

Yes, AHA (Alpha Hydroxy Acids) can generally be used together with Hyaluronic Acid in the same formulation.

AHA works best at a low pH (typically between 3.0 and 4.0) to effectively exfoliate the skin. Hyaluronic Acid is a humectant that provides hydration and can work across a wider pH range, though extreme pH levels can potentially affect its stability or performance over time.

When combining them, it is crucial to formulate the product at the optimal pH for the AHA to ensure its efficacy. Hyaluronic Acid will still provide hydration benefits in this pH range. Ensure proper formulation techniques and stability testing when combining these ingredients.

2. How to fix white foam when blending a serum?

White foam in a serum after blending is usually caused by air entrapment during the mixing process. This can also be exacerbated by ingredients that reduce surface tension, such as some surfactants or certain polymers.

To minimize or eliminate foam:

• Mix slowly and avoid vigorous whipping: Use a low mixing speed, especially during the final stages of blending. Avoid incorporating air by keeping the mixing blade submerged and not creating a vortex.
• Allow time for de-aeration: After mixing, let the serum sit undisturbed for a period to allow trapped air bubbles to rise and dissipate. This can take several hours or even overnight depending on the viscosity of the serum.
• Consider a defoamer: In some cases, a small amount of a cosmetic-grade defoamer can be used, but this should be tested carefully as it can affect the final texture and clarity of the product.
• Review ingredient compatibility: Ensure all ingredients are compatible and properly dissolved or dispersed, as incompatibilities can sometimes lead to instability and foaming issues.

By using careful mixing techniques and allowing for de-aeration, you can significantly reduce or eliminate white foam in your serum.