pH and Ingredient Compatibility in Cream Formulation with B3, NAG, and Extracts

Based on the staff's reply:

• Regarding the pH of B3, NAG, and Light Cream Maker: These ingredients are neutral to slightly alkaline, typically in the pH 7-8 range. A formula containing just these would likely have a pH in this range, not slightly acidic. Adding slightly acidic ingredients like Disodium EDTA helps lower the pH to be more suitable for skin (below 7).
• Adding Soy Extract, Green Tea Extract, and Licorice: It is appropriate and possible to add these extracts to your formula. They will not negatively affect the stability of B3 and NAG. Most ingredients are stable in a pH range of approximately 4.5-7.
• Your proposed formulation: The formulation you provided is feasible. The staff recommends mixing the preservative (Phenoxyethanol) with water first before adding it to the main mixture, especially if not using heat, as preservatives can sometimes thin the cream texture.
• Perfect-C and B3 usage: While it is not recommended to mix Perfect-C and B3 in the same formula, it is also advisable to apply them separately with a time gap, ideally at least 30 minutes, to ensure proper absorption of the first product.