Fact indeed that, Everyone must include a Vit C serum in their Regimen. Question is only which one from the tons of Choices being sold in the Market. Wishtrend has a Great reputation esp. the Vit C serum with 21%. I tried both so I can compare it. For Beginners this one is indeed ideal it has less or no Stinging Sensation effect. The other one is also a great serum but due to high concentration I did experience stinging sensation and I had to start gradually. Only use it mostly at Night time. But this one I use this during Day time without any hessitation. It doesnt leave a tacky feeling. After continous use, my Acne went from controlled to gone and have achieved an even skin Tone. Worth trying it esp if your having Maskne Issues. It is worth the Price.