Ingredient Compatibility and Whitening Effectiveness in Formulas

Based on the information provided:

1. Combining NAG, B3, Glycolic Acid, and Alpha Arbutin in one formula: While possible, it is not recommended for optimal results. Glycolic Acid is most effective at a low pH, which can negatively impact the stability and efficacy of other ingredients like NAG, B3, and Alpha Arbutin, or cause skin irritation. The staff recommends separating the Glycolic Acid formula to ensure you get the full benefits from all ingredients.
2. Whitening effect comparison (NAG + B3 vs. Alpha Arbutin alone): The effectiveness depends on individual skin type. Combining NAG and B3 with Alpha Arbutin may increase the chance of a whitening effect, but it is not guaranteed. If your skin does not respond to the added ingredients, using them might not provide additional benefits compared to Alpha Arbutin alone. The best approach depends on how your skin reacts to each ingredient.