Then add in a Vitamin C. Keep using the niacinamide in the morning, just use the vitamin C at night. Try this for 3 weeks. If everything is working, keep going, or experiment using both layered. I don’t use vitamin C myself, but The Ordinary had a Ascorbic Acid 8% + Alpha Arbutin 2% product that might be a good place to start.
Duke Parameters: The Duke Antioxidant patent outlines the formulation parameters required for effective delivery of vitamin C to skin: 1) pure l-ascorbic acid (vitamin C); 2) an acidic pH within the 2.0-3.5 pH range and; 3) a concentration between 10%-20%
View community ranking In the Top 1% of largest communities on Reddit Thoughts on The Deconstruct Clearing Serum- 2% Alpha Arbutin & 5% Niacinamide This sounds like an interesting formulation to me.
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alpha arbutin vs vitamin c reddit