Glycolic Acid Concentration in Liquid Soap

You've asked about the concentration of Glycolic Acid (AHA) in your liquid soap formula, specifically if the formula needs to be 100%. Based on the previous discussion, the staff recommended using Glycolic Acid (AHA) 100% Powder. The "100%" here refers to the purity of the Glycolic Acid powder itself, meaning it is a pure ingredient.

You do not need to use the Glycolic Acid at 100% concentration in your final liquid soap formula. According to FDA guidelines for consumer products, Glycolic Acid should be used at a concentration of 5-10% in the final product, with a pH not lower than 3.5.

Your calculation method for preparing a 10% solution using the 100% powder is correct. To make a 10% Glycolic Acid solution, you would mix 10 parts of Glycolic Acid (AHA) 100% Powder with 90 parts of water (or other liquid in your water phase) to reach a total of 100 parts. For example, in a 100g batch, you would use 10g of Glycolic Acid (AHA) 100% Powder and 90g of water.

Adding Glycolic Acid to your formula can help with skin brightening and exfoliation, as discussed previously. Your current formula already includes ingredients that can contribute to these goals:

• Papaya Extract: Contains enzymes like Papain that help exfoliate dead skin cells.
• Bamboo Charcoal Powder: Known for its ability to absorb impurities and excess oil, which can help with acne and promote clearer-looking skin.

Other ingredients in your formula like Glycerin and Aloe Vera Extract provide moisturizing and soothing benefits, while Fractionated Coconut Oil can offer emollience. Pure MSM™ is included for oil control and potential exfoliation benefits.

Remember to adjust the pH of your final formula to be within the recommended range (not lower than 3.5 for consumer products containing AHA) after adding all ingredients, including the Glycolic Acid.

In summary, use the Glycolic Acid (AHA) 100% Powder at a concentration of 5-10% in your liquid soap formula, not at 100%. Your calculation for mixing the powder to achieve a desired concentration is correct.