Whitening Pure 22% Pure Vitamin Ampoule

I've been bothered by dark spots and blemishes on my skin, so I've even tried laser treatments, but whether it's because of the toning or something went wrong, the spots have actually gotten darker... It feels like such a waste of money. I heard that vitamin ampoules are good, so I plan to apply them consistently all over my face before bed. I heard that vitamins shouldn't be used during the day. I really wish my skin tone would go back to normal, but looking in the mirror just makes me sigh. Has anyone used this before?