I noticed that whenever I am using niacinamide in lotions, the color usually turns yellowish over time on shelf and in incubator.
I did several knock out experiments until i was sure 100% the niacinamide is the cause of the discoloration. pH of my end lotion is ranging between 5.5-6.5.
Can anyone please explain why is this happening, any degradation ?!! Is there a way to prevent this?