It's my first time using any Vitamin C beauty product, this product has improve my skin texture feeling a lot smoother :) This is just my take on this product it could be different for you. 

i like this serum a lot, it works better than the Klair's one!

Сыворотка с витамином С, выравнивает цвет лица, устраняет "серость", вызванную употреблением кофе, курением и жизнью в загазованных местностях. Убирает воспаления, рекомендую на осенний период

reduces pore sizes. love it. 

I love this serum so much. It does help brightening up my acne scar, but make sure to always apply moisturizer because this serum is a bit drying for my dry skin.