Living in sunny Singapore where its summer all year round can be really harsh on my skin. Tried several vit C serums but nothing came close to this! Love the cleanser as well (it's amazing! Just BUY). Trying out the other products soon from this brand.

Have used this for 2 months and not seen any significant improvement. Disappointing given the price paid. Would not order again.

***English Translation*** Moisturizes without leaving a shine or sticky feeling. Regulates fat. Diminishes the spots of acne fresh and illuminates the skin. The glass jar is perfect and doses very well The only thing I did not like is the smell.

I got this serum in the sampler. I had it for a week. The smell is peculiar to dog-rose. Applied before the cream. The complexion lined up. Now I want to buy the full version of this serum.

Officially the best serum ever - doesn't make my combination skin shiny, goes on nicely under moisturiser and foundation, and does everything it promises and more. Plus, a bottle lasts me six months of twice daily use. Effective and cost-effective: perfection in a pipetted bottle!

The price tag still hurts but I have to say, this worked better than my Vitamin C serum. I noticed a quick brightening result just a week after using it, which to me serves its purpose.

This is the only vitamin C serum I've tried that didn't break me out. I have a lot of pigmentation and I feel that this is effective in lightening the marks. Does not peel or roll on my skin the way some other reviewers said.

I purchased this in high hopes as other Oskia products-like cleansing gel-have been superb. I was sadly left very disappointed due to the fact that this serum does absolutely nothing for the face and will not allow any creams or foundation to go on top. I have tried multiple brands. A complete and utter waste of money-no change on pigmentation whatsoever.

I bought this in order to find a natural lightening product for a serious smattering of "post-inflammatory hyper pigmentation"left after two years of constant adult acne that I received from Mother Nature as a 30th birthday present. Lucky me. Two years later, the aftermath meant I could not leave the house without foundation and a thick concealer, and the hyper pigmentation STILL had a purple cast on my face. I started using this on March 3rd, and by April 15th, my husband noticed a significant lightening of the discoloration, so much so a CC cream (Peter Thomas Roth camu camu) and a light dusting of powder to set was more than enough to conceal. I have two thirds of the bottle left so it will last me at least 8 more weeks. It's no more expensive than other serums that promise results and do nothing. As a prep to the serum I would double cleanse and use an acid pad ( PTR unwrinkle) and would press the serum into the skin. I did not like the smell, but is dissipates quickly and who cares, really if it does what it says on the tin? I apply a high SPF whenever I go out and avoid going out during peak hours. As I work from home, I would use this in the morning and my Differin at night. I don't know how it would respond to layering products, like make up, as others have said, it does have a sticky residue. But, despite the smell and the tacky feeling, it is packed full of outstanding research-based high quality ingredients and will provide results, if used consistently, and with SPF. I will repurchase.

I was looking for a Vitamin C serum and saw this also contains niacinamide - brilliant for evening out skintone. Being Oskia, it also contains the signature MSM. I already take the Oskia MSM supplements, which are like a miracle supplement for me. I like this serum very much. I wanted to take a break from my strong retinoids over the spring/summer, so am happy I have this as a replacement.