ost vitamin c serum review




OST Original Pure Vitamin Serum C20 rose to become one of Korea’s best selling vitamin C in 2012 and was known as the ‘red bottle’ in Korea. It managed to compete with other famous international skincare brands such as Sisley and Estee Lauder as the Top 3 Serums at the prestigious SURE BEAUTY AWARDS. So what is this OST serum all about ?


Features :

+ Includes pure Vitamin-C 20%
+ Whitening /Recovering trouble scars
+ Removing blackheads
+ Ranked the best selling item in Singapore No.1 commerce. (2012)


Most of the products with vitamin C out there contain less than 2-3% of Vitamin C, but this contains a whopping 20%. Vitamin C is known to be one the most powerful anti-aging antioxidant. It is also extremely well known in whitening products. I will be talking more in depth about this in the ingredients section.





As this is known as the ‘red bottle’ in Korea, therefore you expect the packaging to be all red but it is more like silver orange. It comes in a nice glass tinted jar which is important as Vitamin C is extremely easily oxidized by sunlight therefore the packaging is extremely important to slow down the oxidation process of the Vitamin C. Store the product in a dark, cool place. I keep mine in the refrigerator.

The packaging of the serum itself comes with a dropper. When newly purchased, the pipette is packed separately and the cap of the bottle is sealed. So make sure that you get a product that is sealed and with the pipette packed separately. This also ensures the freshness of the product as well as to avoid any oxidation of the product. You would have to fix the pipette into the bottle yourself.





Shows both the manufacturing and the expiry date on the box of the packaging.







The serum has the typical texture of a serum – gel like, watery. It does smell fruity and citrus-y which is refreshing. The slimy gooey texture does absorb rather quick but however, it really leaves a very sticky and uncomfortable after-feel which is absolutely uncomfortable.




The colour of the serum is colorless initially, but it will gradually turn orange-yellowish after a few weeks due to the oxidation. Therefore I strongly advice you use the serum up ASAP. I do have a few tips on how to avoid a sticky-goey after feel and how to use it up asap!


What I do is that I mix my toner with the serum on a 2 to 1 ratio. This helps in making the serum less sticky, and also aids in making the toner sort of like a booster. You can also mix this with your emulsion or cream. You can even mix it with your sunscreens or sun products as they help to boost the efficiency of sunscreen actives.





Hydration and Oil Test



As you can see below, there is hardly any oil in this product.



Hydration level did improve drastically upon application of serum. High scores of hydration level in both cases.








Stickiness Test



As mentioned earlier, the biggest weakness of this serum is the stickiness. As you can see, it is really sticky.




And the stickiness improves when it is mixed with a toner.







Ingredients : Water, Ascorbic Acid, Alcohol, Sodium Lactate, Butylene Glycol, Glucose, PEG-60 Hydrogenated Castor Oil, Sodium Hyaluronate, Bis-PEG-18 Methyl Ether Dimethyl Silane, Methylparaben, Diethoxyethyl Succinate, Phenoxyethanol, Ammonium Acryloyldimethyltaurate/VP Copolymer, Xanthan Gum, PEG-180, Gluconolactone, Camellia Sinensis Leaf Extract, Beta-Glucan, Rosa Davurica Bud Extract, Citrus Aurantium Dulcis (Orange) Oil, Zinc PCA, Panthenol, Niacinamide, Carthamus Tinctorius (Safflower) Flower Extract, Glycerin, Tocopheryl Acetate, Lecithin, Caprylic/Capric Triglyceride, Ubiquinone, Diisopropyl Adipate


As you can see from this photo below, a bottle of this serum is equivalent to the vitamin C in 120 strawberries, 200 oranges and 40 grapefruits. This OST Serum uses 20% of L-ascorbic acid which is one of the most stable forms of VItamin C.



Vitamin C as a cosmetic ingredient became popular when a scientific research paper published their results regarding L-Ascorbic Acid ( the type of vitamin C used in the OST serum ) being able to reduce UVB damage when applied to the backs of hairless pics. The evidence also indicated that photodamage or sundamage could be repaired with the topical use of Vitamin C. Later on, much more studies showed the wonders of VItamin C effect on the skin which helped in the popularity of L-Ascorbic as a skincare ingredient.

Vitamin C helps in different ways. It is a strong antioxidant which helps to neutralize the free radicals caused by the sun.It promotes collagen production, strengthens the skin barrier response, improve the appearance of sun-damaged skin, improves skin texture, etc.

Besides Vitamin C, the serum also contains other beneficial skincare ingredients such as the moisturizing sodium hyaluronate and rose extract, camellia extract, panthenol and beta glucan to soothe sensitive skin. It also contains antiaging  Niacinamide, Vitamin E and Coenzyme-Q10.


The bad : Alcohol, phenoxyethanol and methylparaben quite high up the list.







In all honesty, I wanted to give up after using this product for 3 days. I just couldn’t deal with the stickiness of the serum, but I forced myself to give at least one week to see if there were any difference with my acne and skin texture in general. I am glad I did because it did reap some positive benefits on my skin.


I have always had doubts when I see photos like this below. But when I took a photo to see the progress after two to three weeks, I was quite surprised to see the results. It not only helped in smoothening the general texture of my skin, but also helped in my pimples as well as the red spots. 




My before-after photo a
fter 2-3 weeks :




While using this routine, I coupled it up with Skin&Lab Vitamin C Cream and used a very generous amount of the serum especially during the night period as I wanted to finish using up as soon as possible due to the quick oxidation of Vitamin C.

Other tips on how you could use the Vitamin C :

  • Mix it with your toner
  • Mix it with your cream – I was using it with
  • Mix about a whole pipette of serum with your normal sheet masks.


Those with skin problems, I would recommend to give this a try as it really is affordable compared to the Vitamin C serums which are at 20% concentration out there. For those without any major problems, I would recommend another Vitamin C serum as it is just tooo hard to deal with due to the texture of the serum. Those who are looking for a powerful skin brightening whitening duo can try the serum together with the Skin&Lab Vitamin C Cream.


The OST VItamin C Serum can be purchased here at Wishtrend at only USD24.99. The Skin&Lab Vitamin C can also be found here. You may also find some interesting promotions at Wishtrend on their Beauty Steal section here. And to top it off, Wishtrend has generously donated a special 15% discount coupon which is available for any purchase on Wishtrend.com, so if you have been wanting to try this or the other stuff available on Wishtrend, this is a time.


Coupon 15% Discount Code : 4S6KT1WZ ( For orders above $30USD )

Categories: beauty reviews, OST
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