Night Cream Formulation Compatibility and Stability Issues
Question
I would like to inquire about the compatibility of a night cream formulation. The focus is on skin brightening, exfoliation, and stretch mark reduction.
Can I use the following formula? If so, please provide the mixing procedure:
- Rose Hip Oil: 20%
- Sodium Lactate 60% Liquid: 10%
- Lactic Acid: 5%
- Water: 51%
- Xanthan Gum: 1%
- Phenoxyethanol: 0.5%
- Water-in-Oil EZ™: 0.8%
- Vitamin B3: 5%
- GlucoBright™: 4%
- MSH White™: 2%
- น้ำหอม (Fragrance): 0.7%
Also, I have a quick question: The Rose Hip Oil sold by the company has two different prices. What is the difference between them?
Answer
Regarding your night cream formula for whitening, exfoliation, and stretch marks:
Based on the ingredients and percentages provided, particularly the high water phase content (around 79%) compared to the oil phase (around 21%) using Water-in-Oil EZ™ as the emulsifier, this formula is unlikely to be stable or form a proper cream texture. Water-in-Oil emulsions typically require a higher oil phase percentage or a different emulsifier system to successfully incorporate such a large amount of the water phase.
Also, the combination of Lactic Acid and Vitamin B3 (Niacinamide) requires careful pH management. A low pH suitable for Lactic Acid exfoliation can potentially convert Niacinamide to Niacin, which may cause skin irritation or flushing.
Since the formula as written is likely incompatible, I cannot provide a mixing procedure for it. You may need to revise the formula significantly, perhaps by adjusting the phase ratios or considering an Oil-in-Water emulsifier system if you aim for a cream with high water content.
Regarding the two prices for Rose Hip Oil: I cannot access specific product variants, sizes, or pricing details on the website to explain the difference. Different prices often correspond to different product sizes, grades, or suppliers. Please check the product page carefully for details or contact customer service for clarification.