Review: C20 Pure VitaminC 21.5 Advanced Serum

2:20 PM

Hello guys! Before I start, I would like to apologise for not posting a lot these past few weeks, summer has kept me pretty busy and i've decided to take a break from blogging to really enjoy my holidays. HOWEVER, i'm fully back and i'll TRY MY BEST to update you guys regularly~

So today i'll be reviewing a super popular, immensely raved and super exciting product, the OST C20 Vitamin C Serum (Advanced Version). 
This item was sent to me by Wishtrend, however I chose the product myself since I was genuinely intrigued by the serum, and all my opinions and reviews will remain unbiased. For further information about the sponsorship, check my Disclaimer. This post will include affiliate links.

Product description and claims:

The Vitamin C 21.5 Advanced Serum is an upgraded version of the original OST VitC serum. 
(copied from Wishtrend.Com)

The new and improved formula has been designed with less ingredients 
for more effects.
 Made with simpler ingredients directly from Mother Earth, 
the Pure Vitamin C21.5 Advanced Serum has been created with a sheer 21.5%
of pure vitamin C for the maximum nourishment. When everyone said it was impossible, we made it happen.
Just for you, We increased the level of vitamin C and hydration while
lowering the stickiness and ingredients for a healthier, pure formula
to replenish moisture while restoring suppleness to the skin. 
Rejuvenate and nourish with the new and improved, all-natural upgraded
formula to restore balance and moisture to your skin today.

The Vitamin C serum will help with:
-Brightening and whitening
-Skin pigmentation and dark spots
-Uneven skin tone
-Dehydrated skin 

Volume: 30ml

Suitable for all skin types.


Hippophae Rhamnoides Water, Ascorbic Acid, Sodium Lactate, 1,2-Hexanediol, Sodium Hyaluronate, Panthenol, Cassia Obtusifolia Seed Extract, Allantoin, Xanthan Gum, Ethyl Hexanediol

Something great about this serum is how little ingredients it contains, it really makes me feel safer and more relieved to know i'm not slapping a wide variety of chemicals onto my skin.


The serum is actually a lot smaller than I imagined, but since it oxidises quickly, it's actually better that way. It comes in a glass bottle with a helpful pipette to extract the product inside.

Luckily for us international AB fans, the packaging comes with english instructions, directions, ingredient and precautions ^_^ 

Texture and scent:

The product has a slight citric scent, but nothing too harsh or strong. The texture is very liquid and runny, and once you apply it onto the skin, there is a little sticky feeling. I haven't tried the original version, but many people say that compared to the first version, the upgraded version is a lot less sticky. 

How I used:
I used 2 pumps of this serum after I cleanse and tone my skin. I use the pipette to extract the serum, and gently slap the product by pressing my hands onto my skin. I only use it at night, since it's dangerous to use the serum during direct sunlight (even though SPF should fix the problem, but I prefer not to take any risks.)

This serum also has to be stored in a fridge, to prevent it from oxidising.

When I first applied this product, there was a tingling sensation (nothing too overwhelming, but definitely noticeable). The tingling went away with time, as my skin accustomed and adapted to the serum. 

Something else that I noticed, is that the serum left a stain on my pillows and everything that I rested my face on. Perhaps it's because I applied to much (two full pumps) or because I didn't use anything else after the serum, but it's definitely something to watch out for.


I apologise for the difference in lighting, it's the best I could do T_T
As you can see, the red blemishes on my cheeks reduced a little, and these pictures have a time difference of a month. The change isn't very significant, but in real life I definitely feel like I have brighter skin and my skin tone is a lot more evened out.

Pros: 美容护肤"
-Parabens free
-Composed of a little number of ingredients
-Helped with brightening 
-Aids with hyper pigmentation

-May stain your pillows/sheets
-Oxidised relatively quickly
-Has to be stored in a fridge (i'm so lazy to walk to the kitchen T_T )

After reading many reviews and raves on this product, I have to say that my expectations were sky high. The serum might have not been miraculous, but I definitely think it was completely worth trying. My skin feels brighter and a livelier ^_^ Recommend? Yes!! Repurchase? Not for now, since it's quite a high maintenance product, but i'll definitely try it again in the future if I need a serum.


You can get this product from for USD24.99+FREE SHIPPING


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  1. The fact that it stains the pillow made me wonder if it's gonna stain my face yellow too? It's actually an interesting product and I've come close to getting it so many times lol. But the fact that it is a high maintenance products (with all the oxidation concern/ sun sensitivity risk) kinda prevents me from trying it out. Love the result though! Thanks for the review! <3

    Pastel Boulevard

    1. I actually never thought about that, but I don't think so. At least it didn't happen to me, neither to anyone else that I know of. I definitely think it is worth a try!! Despite it taking a little more care, the results were great ^_^

  2. I've heard so many things about this serum! Looks nice!

  3. I've seen this being reviewed so many times and on WISHTREND as well, and I'm just so tempted to purchase it because of the rave >.< I'm glad this product worked for you and I'll probably get this when my current serum runs out :)

    Kelly ♡

  4. Some of my skin care needs to be stored in the fridge and I'd usually end up forgetting to apply them T.T

    Oh Dear Bumblebees

  5. I like the vitamin C serums from OST. I'm using the same at the moment, but I think the old formula gives a stronger result in the same time.

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