Adjusting Serum Formulation for Whitening and Skin Health

Based on the feedback provided, your mixing method is correct. However, there are some suggestions regarding the ingredient percentages:

• Reduce French Pine Bark Extract 25 (Liquid) from 20% to around 3-5%. At 20%, the color is very intense and may darken the skin significantly.
• Consider adding Vitamin B3 (Niacinamide) at 5% to help strengthen the skin and enhance the whitening effect of Perfect-C.
• You can reduce Soy Extract from 10% to 5% to make room for the Vitamin B3. This combination provides more comprehensive benefits as these ingredients work through different mechanisms.