Been using this almost nightly for close to a month, in conjunction with the OST Vitamin Sleep 9 to 5 cream, and I have noticed a gradual fading of fresh pimple scars.  Cannot yet see other claims of blackhead removal, whitening etc... Although Vit C as an antioxidant should fight the effects of aging over long periods of use.  I find the serum quite sticky and stinging on the face, so I'm not sure if I will keep using it as I do not have much pimple/acne problems to begin with. 

very good, recommended!

It abit sticky but works on me. But it also makes me feel itchy at the same time.

Honestly i feel a really big difference whenever i'm running out of this serum. This makes my skin so much better. Even for my "wrinkles" (i'm on my 20's so this is small wrinkles tho) after some use it really dissapear. But when i'm running out of this product then it appears again. It makes your face brighter... Anyway yeah, i recommand it.  

Love that it arrives sealed separately from the dropper. Has helped with hyper pigmentation. 

Good serum. My skin is a little bit brighter. Maybe using in long time will have better effect. 

This product has been talked about a lot in the beauty community and I see why. It is an excellent vitamin C serum. My advice is to use this right away. I bought a back up of this and left it stored for a while, when I opened it sadly it has gone bad so you have to be careful and follow the storage instructions.

I've been using this for more than a month now, and I did notice a bit of lightening. Maybe if I will continue it, (or if I try the C.21 one?) I'd see more visible results. I was afraid it'd be harsh on my skin, but other than some heat, I didn't feel any stinging at all.

i love this serum, but not good smell i dont like the smell

It is a  good product. Does its job :)

very good, recommended!

A  lightweight and fast absorbing serum. 

this is by far the best serum I've tried. it helps brighten up, alms my acne and make
my skin look so much healthier.  

first i love how it's smell like fresh orange ! i like it but after i use it it's feel sticky on my face i don't know why 

This serum is the best for me. It helps me to reduce scars.   

I really brighten my skin well! But i have a sensitive skin so it is a bit irritating to me when i put it on.