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[O.S.T] C20 Original Pure Vitamin C20 Serum - 30ml
30 items sold

[O.S.T] C20 Original Pure Vitamin C20 Serum - 30ml

Place of origin
KOREA Condition New Product
Shipping From From Overseas (South Korea)
Payment Method VISA, MasterCard, JCB Card, PayPal, E-Nets, AXS, Convenience Store, Cash Deposit, Q·account
After sales service Please contact seller or manufacturer service center.
Return/Exchange Need to return item to seller's address by using post office or other shipping service.
BOOKMARK 1 2 3 4 5 6 7
Customer Satisfaction 39 (92%)
This chart shows buyer's satisfaction level.
product 20%
price 20%
delivery 20%
service 20%

Customer Review(41)

Customer Review board
Rating Feedback Date Written by
Highly Recommend 2017-03-23 cel*******
Highly Recommend 2017-03-21 cai*******
Highly Recommend 2017-03-14 ach*******
Highly Recommend 2017-03-13 mis*******
Highly Recommend 2017-03-01 yfy*******
Highly Recommend 2017-02-28 hei*******
Recommend 2017-02-28 cin*******
Recommend 2017-02-26 hig*******
Recommend 2017-02-23 mis*******
Highly Recommend 2017-02-17 sho*******

Seller Information


  • Address : Donae-dong, Deokyang-gu, Goyang-si, Gyeonggi-do 958 Daeyeong-plaza 7F
  • Available during:월~금: 오전 9시~오후 6시 토: 오전 9시~ 오후 1시 일, 공휴일: 휴무
Item Q&A(5)
No. Question & Answer Member Date Status
23198224 Manufacturing Date mic******* 2016-07-24 Answered
Hi, what is the manufacture date and how fresh is the stock? Want to maximize the time to use it before it oxidizes. Thanks for the help.
[Re] Manufacturing Date
Hello, my customer!
We know the C20 serum is easy to spoiled with short term,
So we are handling its expiry date carefully, you don't need to worry about that :)

16097016 No receive item pin******* 2015-01-13 Answered
Hi, I haven't receive my item until today. PLS check (:
[Re] No receive item
Hello customer and thank you for letting me know as to your questions
I am very sorry to hear that you still have not received your goods until now
Before taking alternative actions, could you please do me a last favor?
How about checking out the post office nearby you ..?
This is because it is very strange happening even it has quite long time passed since dispatching your item...
Plus, quite number of customers have found their goods in the either custom or Post office..
The parcel that we used is Korea Post ..
Sincerest regards`
15918393 C21.5 cor******* 2014-12-29 Answered
Will you be bringing in the new C21.5 soon?
[Re] C21.5
Dear customer,
We will approach you once it is able for sale!
And try to keep close with our web site!
Thank you! :)
15029149 Order Number: 47141935 ruh******* 2014-10-22 Answered

I am referring to Order Number: 47141935 on Sep 29, 2014, whereby I ordered the OST Original Pure Vitamin C20 Serum. The serum was leaked as shown in the picture attached.

Please advise.

Thanks and Regards,
[Re] Order Number: 47141935
Hello, friend

We sincerely apologize to you for this inconveniences
I know this is so frustrating for your and you were really upset for this situation
But, for us, we can see it leaks so little and it seems that amount of leaking doesn't make lots of difference..
So we are really sorry but, we would like to add a lot of and high-quality samples to your next order for our excuse If you leave a memo on your next order..
I will tell our shipping agent not to make this happening strongly..
I really hope you understand....

Looking forward to hearing from you soon
[Re] Order Number: 47141935

Since it has leaked and the serum turned out to be a black color liquid form, I avoid using it in case it create an impact on my skin. Just check with you if I can get it replace with a new set?

[Re] Order Number: 47141935
Dear customer
First of all, I would like to sincerely apologize for this unexpected matter which may cause you inconvenience. <--

please pay for shipping fee again.

As you requested, I would like to re-send your item again, your item will be dispatched soon after you please pay for shipping fee again. You don't have to send it back
I hope you will feel better by doing this and hope to do business with you in the future again.
Sincerest regards
14977128 can it be used with enzyme soap ? chr******* 2014-10-18 Answered
I have been using enzyme soap bars for my face which has exfoliating properties daily. Can I still use the vitamin c serum after cleansing my face with the enzyme bar everyday ?
[Re] can it be used with enzyme soap ?
Hello, friend!
I think you should check 'instructions' first if the item is recommended by a hospital.
If not, using serum is usually okay after expoliating. :)

If you have any further questions or concerns, please do not hesitate to contact us
We consider customer satisfaction as priority and look forward to doing business with you
Thank you :)

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