Liquid Soap Formulation: Foaming, pH, and Ingredients for Dry, Itchy Skin

Hello! I understand you are formulating your own liquid soap to address dry and itchy skin. Based on your questions and the staff's replies, here is the information:

1. Cooling Sensation and Fragrance (Questions 1, 2, 3)

According to the MySkinRecipes staff's recommendation, for skin that is imbalanced, very dry, and itchy, it is not recommended to add any cooling ingredients (such as Menthol or CoolTouch/Menthyl Lactate) or any fragrances to the formula. This is because these ingredients can increase the risk of skin irritation, especially Menthol, which has a higher potential for irritation than CoolTouch. Although CoolTouch has a much lower potential, it still carries a risk for skin that is not in a normal state.

Therefore, using Menthol instead of CoolTouch and adding the inquired fragrances are not recommended for your current skin condition. This makes the questions about the quantity to use, the solvent (Propylene Glycol, Flora Solve), and how to make the fragrance or cooling sensation last longer currently irrelevant. You should focus on helping your skin return to a normal state first.

2. Foaming Performance (Question 4)

The staff explained that the foaming performance of the combination of Coco Betaine (160) and Lauryl Glucoside (177) is lower than that of Coco-Foam (968) or amino wash (513). Lauryl Glucoside, in particular, produces very low foam.

Therefore, using Coco-Foam with Coco Betaine and Lauryl Glucoside in body soap results in less foam than using Coco-Foam with amino wash in face soap, and it is not possible to achieve the same level of foam with the former combination.

If you desire better foam, the staff recommends trying Sulfate Free Shampoo Base (1107) together with Coco Betaine (160).

Creamy Foamer (Sodium Methyl Cocoyl Taurate 305), which you inquired about, is a gentle surfactant that provides good foam and can be considered as an alternative.

3. pH Adjustment

Using Lactic Acid (170) to adjust the pH of your liquid soap to be suitable for the skin is appropriate.

Hope this information is helpful! If you have any further questions, feel free to ask.