Q&A: How do companies use niacinamide and glycolic acid in the same product?

In the September Q&A, Charlette asked this epic question: Hello Susan! Can you clear up a little dilemma? I have read that Niacinamide is NOT effective in formulas unless the pH is around 6. I also have read that Glycolic Acid is absolutely useless in formulas if the pH is over 4. Here’s my confusion:…