Cream Formulation Issue: Thinning with Potassium Azeloyl Diglycinate and Skin Tingling
Question
I tried making a cream using 1% Light Cream Maker mixed with 70% water and got a nice cream texture. However, when I added 10% Potassium Azeloyl Diglycinate, the cream turned completely liquid. I'm not sure if I did the steps incorrectly. If the cream is liquid like this, is it spoiled? If not spoiled, how long can it be stored?
I also have a follow-up question for general knowledge: I once used a cream that caused a tingling sensation on my face the first time I used it, but I didn't feel the tingling anymore after continued use. Why does this happen?
Answer
Information Regarding Potassium Azeloyl Diglycinate
Based on your questions and the previous discussion, here is the information regarding Potassium Azeloyl Diglycinate:
Usage in Sunscreen
According to the previous advice, it is generally not recommended to use ingredients that cause skin exfoliation in formulations intended for sun exposure. While Potassium Azeloyl Diglycinate (such as Azela-Lip™) is primarily used for skin brightening and reducing oiliness/clogged pores, some skin brightening ingredients can potentially increase sun sensitivity. Therefore, following the recommendation to avoid such ingredients in sunscreen is advisable.
Recommended Usage Percentage
For products like Azela-Lip™ (Potassium Azeloyl Diglycinate Ultra-Fine Powder), the recommended usage rate is typically 0.1-2.0%.
Formulation Issue (Cream Turning Liquid)
You observed that your cream formulation (Light Cream 1% + Water 70%) turned liquid after adding 10% Potassium Azeloyl Diglycinate. This happened because Potassium Azeloyl Diglycinate is an electrolyte. Electrolytes can destabilize or weaken certain cream makers, including Light Cream Maker, causing the emulsion to break or thin out significantly.
To fix this, as suggested previously, you should increase the amount of Light Cream Maker. Trying a concentration of 2-3% Light Cream Maker should help the cream regain its desired consistency.
Shelf Life of Liquid Cream
If the cream turned liquid due to the electrolyte issue but was otherwise prepared correctly and not contaminated, it is not considered spoiled in terms of safety for use. It can generally be stored for the usual shelf life of the formulation, provided it is kept properly sealed and stored according to recommendations (e.g., in the refrigerator for Azela-Lip™).
Tingling Sensation from Cream
The phenomenon where you initially feel a tingling sensation from a cream but it subsides with continued use is often because your skin becomes accustomed or "used to" the ingredients in the product. This is a common adaptation response of the skin.
