Analysis of Your Formulations

You've provided two cosmetic formulations and asked if they can be mixed and if adjustments are needed.

Mixing these two formulas as they are is not recommended due to potential ingredient incompatibilities and concentration issues.

Here are the main points:

• Incompatibility of Ethyl Ascorbic Acid and Niacinamide: Formula 1 contains Ethyl Ascorbic Acid, and both formulas contain Safe-B3™ (Niacinamide). According to the information for Ethyl Ascorbic Acid, it should not be used in formulas containing Niacinamide. Combining these two ingredients can lead to instability or reduced effectiveness of the active ingredients.
• Ethoxydiglycol Concentration: Both formulas use Ethoxydiglycol at 3%. The recommended usage rate for Ethoxydiglycol in leave-on products is currently not more than 2.6%. Using it at 3% exceeds this guideline.
• Salicylic Acid Forms: Formula 1 uses Willow Bark Extract (a natural source of Salicylic Acid), and Formula 2 uses Complex Salicylic Acid (a water-soluble powder form). While these can offer different benefits, combining them might result in a higher total Salicylic Acid concentration, which could increase the risk of skin irritation.

If you wish to create a formula with similar benefits, it would be best to formulate a new recipe carefully considering ingredient compatibility and adhering to recommended usage rates for each component, especially regarding the incompatibility between Ethyl Ascorbic Acid and Niacinamide, and the usage rate of Ethoxydiglycol.