Vitamin C without Niacinamide

Hi, I’ve been looking for a vitamin c serum to target my hyperpigmentation, but my skin can’t handle niacinamide which is in most of the products in the brightening range. I’d really appreciate any recommendations for vit c serums without niacinamide, thank you! For more context, I’ve been using the dear klairs vit c and TO alpha arbutin duo for around 2-3 months, so I’d like a vit c serum with a slightly higher percentage:)