Vitamin C works extremely well with ferulic acid, vitamin E, vitamin B, niacinamide and hyaluronic acid and help to enhance its benefits. You can certainly layer skin care products when using vitamin C in your routine. I recommend applying vitamin C first and allowing a couple minutes for product absorption and following with your other skincare products.
I don’t recommend using vitamin C with AHA’s, BHA’s, glycolic, salicylic and retinol. Combing these skin care ingredients can cause potential irritation, inflammation and dryness to the skin.