C Lip Serum Collection (4 Piece) Does Vitamin C Serum Help Reduce Acne and Oiliness in Humid Weather? FoxtaleDownload the App Is it actually crazy if it works? , One of the few Vitamin C serums that dont break me out is from @dr.altheaglobal . I read somewhere that Vitamin C can help reduce lip pigmentation, so I put it to Meet the Vitamin C Serum That Hit Icon Status Vitamin C serum can be used either in the morning or night and even twice a day. , If you apply retinol at night, then use vitamin C serum in the morning. If you only use a moisturiser at night, then