Cosmetics Formulation Development

this formula lotion want to focus on ผลัดเซลล์ผิว for white and clear skin [[[Ingredients]]] - น้ำมันมะพร้าว 30 % - น้ำกลั่น 25 % - Vitamin C (L-ascorbic acid) (Standard) 20 % - Polysorbate 20 (Tween 20) 10 % - Vitamin E ( Tocopheryl Acetate ) 5 % - Glycerin 5 % - Synthetic White Beeswax 5 % [[[Mix method]]] Part A: Take น้ำกลั่น + Glycerin + Vitamin C (L-ascorbic acid) (Standard) Mix well, set aside. Part B: Remove น้ำมันมะพร้าว + Vitamin E ( Tocopheryl Acetate ) + Polysorbate 20 (Tween 20) Mix well, set aside. Part C: remove Synthetic White Beeswax Go to Double-boiler until dissolved, then add part A and mix well, followed by part B, stir well, then remove from the oven and วัดค่า pH to get at 3-4, please consult as follows. 1) From the formula, is there a percentage of the substance that needs to be reduced-added? 2) What substances should be added to it? To help with whiteness again? 3) The resulting lotion, the texture is not quite smooth. It seems that it doesn't match well, I'm not sure where the mixing process is wrong or not สารกันเสีย Should it last up to 1 year? If not, should put สารกันเสีย Which one does not affect the ingredients? can add a scent that is Essential Oil I combine oils? Thank you very much

Hello, the formula cannot be mixed. The problem is as follows: 1. Vitamin C ascorbic acid must be dissolved. in the water And the usage rate is up to 20%, at least 60%-65% of water is required to dissolve Vitamin C if lower There will be a problem of sedimentation and will not dissolve. 2. Vitamin C ascorbic acid when dissolved in water will have a short lifespan (Please check usage restrictions. (Click to read the details of ingredients and restrictions on use on the web page) 3. Use Polysorbate 20 at a rate of up to 10% will cause skin irritation 4. The formula does not use a suitable cream maker to combine water-oil (using Polysorbate 20 This formulation cannot be synchronized. which has a high oil of 30-35%, regardless of whether the rate is as high as 10%)