Facial Essence Formulation without Preservatives: Formula Check and Safety

Question

I want to make 200g of facial essence (น้ำตบ) but don't have equipment or a scale. I plan to order ingredients in exact amounts needed. I intend to use it before bed for hydration and slight skin tone adjustment. Texture is not important. I will not add สารกันเสีย (the minimum purchase quantity is much larger than needed) and plan to store it in the refrigerator instead. I have listed the ingredients I plan to buy. Could you please check their suitability? Double Hyaluron Liquid 10 g = 5% Safe B3. 10 g = 5% GlucoBright. 8 g = 4% PiteraEx(Sacch.) 2 g = 1% น้ำกลั่นปราศจากเชื้อ. 170 g = 85% Total 200 g = 100%

MySkinRecipes Expert · Accepted Answer

Hello! I understand you want to make a simple facial essence (น้ำตบ) at home, aiming for a 200g batch with pre-measured ingredients and no weighing scale, planning to store it in the refrigerator without preservatives.

The list of ingredients you provided is suitable for creating a hydrating and skin-conditioning essence. The ingredients (Hyaluron, Niacinamide, N-Acetyl Glucosamine, Saccharomyces Lysate Extract) have appropriate properties for your goal, and the percentages you listed are within the recommended range for this type of product.

Important Considerations:

Not Using Preservatives: Even with refrigeration, making water-based cosmetic products without preservatives carries a very high risk of microbial contamination (bacteria, mold, yeast). Refrigeration slows down growth but does not kill microbes or prevent contamination from daily use. Contaminated products can cause skin irritation or other issues. It is highly recommended to consider using a preservative in a small amount as advised by the supplier for product safety. If the minimum purchase quantity is a concern, perhaps inquire if smaller trial sizes are available, or consider purchasing a larger size for long-term safety.
Lack of Weighing Scale: Attempting to measure without a scale, even with pre-measured ingredients, can lead to inaccuracies in the final percentages, which might slightly affect the product's efficacy and texture. For accuracy, a digital scale capable of precise measurements is recommended.

Conclusion:

Your proposed formula is suitable in terms of ingredients and percentages for a hydrating and skin-conditioning essence. However, the issue of "not using preservatives" is a significant safety risk. I strongly advise you to consider using a preservative to extend the product's shelf life and prevent contamination.

If you absolutely cannot use a preservative, it is recommended to make very small batches and use them within 1-2 weeks, storing the product in a clean, sealed container in the refrigerator at all times. Also, observe the product for any signs of spoilage, such as changes in smell, color, or appearance. If any abnormality is found, discard it immediately.

I hope this information is helpful for your decision. If you need recommendations for suitable preservatives, feel free to ask!