What to Avoid When Using Vitamin C Serum Vitamin C serum is a powerhouse in skincare —brightening, evening skin tone, and fighting free radicals. But to get the most out of it (and avoid irritation or ineffectiveness), there are a few things you shouldn't do. Here's what to avoid when using Vitamin C serum: Avoid Using It with Certain Ingredients Some active ingredients don’t play well with Vitamin C, and combining them can cause skin irritation or reduce their effectiveness. Avoid: Benzoyl Peroxide – It can oxidize Vitamin C, making it less effective. Retinol – Both are strong ingredients, and using them together can irritate sensitive skin. AHAs/BHAs (like glycolic or salicylic acid) – Using them right after Vitamin C can increase the risk of irritation or dryness. Use Vitamin C in the morning and reserve other active ingredients like retinol or exfoliants for nighttime. Don’t Skip Sunscreen Vitamin C boosts sun protection, but it doesn’t replace sunscreen. UV rays can s...