Adding Whitening Ingredients to Different Cosmetic Bases (Serum, Cream)

Based on the staff's response regarding adding ingredients to your existing serums:

• Formula A: This formula contains Sodium Ascorbyl Phosphate (Vitamin C), which requires a very narrow pH range for stability. Adding other ingredients is not recommended as it could disrupt the pH and cause the Vitamin C to degrade.
• Formula B: This is a water-based formula without oil-water emulsifiers. The ingredients you wish to add (GlucoBright, WhiteCumin, Alpha Arbutin, Safe B3, 4MSK) are all water-soluble and can be added to this formula. However, please note that this formula seems intended to be very light (like a toner or light water-based serum). Adding too many ingredients might make it feel sticky or heavy, which could change its original purpose. The staff did not comment on the suitability of the combination itself, only the possibility of adding.
• Formula C: This formula has a cream texture. You can add the ingredients to this formula, but you will need to mix or blend thoroughly. Some of the ingredients you mentioned are powders, and they will need sufficient mixing to dissolve completely into the water phase of the cream base.

In summary, you can add the ingredients to Formula B and Formula C, with the considerations mentioned for each. Adding to Formula A is not recommended.