The BY WISHTREND Pure vi-ta-min C21.5 Advanced Serum is a vitamin C serum made with 21.5% pure vi-ta-min C. Formulated with only 10 essential ingredients, this new và improved formula has been designed with less ingredients for more effects. Wishtrend has increased the level of vitamin C và hydration for a healthier, purer formula that replenishes moisture while restoring suppleness khổng lồ the skin. Vitamin Tree Water hydrates và adds life lớn the skin, while Panthenol và Allantoin allow you to lớn use this high concentrate vitamin serum for an extended period of time without irritation.

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PLEASE NOTE:1.) ALL vi-ta-min C products can degrade from sun exposure, so make sure you keep yours away from sunlight to lớn preserve the formula. Best khổng lồ keep in the refrigerator.2.) Follow up with a sunscreen when used during the day. 3.) If this is your first time using a vi-ta-min C product, a minor tingling may be experienced. This is a normal process due lớn the difference of p
H levels in the skin and the vitamin C. A slight warming sensation may also be felt upon application. This is a natural phenomena that occurs as the vitamin is being absorbed into the skin. 4.) lớn avoid irritation, it is not recommended lớn apply this serum after exfoliators (AHA, BHA products included) have been used.

Suitable for all skin types.



Hippophae Rhamnoides Water (70%), Ascorbic Acid (21.5%), Sodium Lactate, 1,2-Hexanediol, Sodium Hyaluronate, Panthenol, Cassia Obtusifolia Seed Extract, Allantoin, Xanthan Gum, Ethyl Hexanediol

Disclaimer: While we strive to lớn ensure the accuracy of all our sản phẩm information, please lưu ý that sometimes products are updated or changed without notice. Before use, we recommend referring khổng lồ the item"s packaging for the most up to date ingredients list, warnings and directions. 


After cleansing & toning, Put about 1-2 drops of the C21.5 vitamin Serum on khổng lồ the hand & apply to dull và sagging target areas. (Avoid sensitive areas such as eyes & lips.)TIP: This is a sản phẩm with pure concentrated vitamin C as a key ingredient, so it is recommended to use the product as soon as possible after purchase.

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▪For external use only ▪Avoid contact with eyes ▪Do not apply lớn broken or inflamed skin ▪Keep out of reach of children ▪Use with care for easily irritated skin, testing on small areas recommended ▪Discontinue use if signs of irritation appear ▪Store in cool and dry places, away from direct sunlight

You may know that one of my favourite products from Wishtrend is the OST Original Pure vi-ta-min C20 Serum. I reviewed it previously, but I didn’t have any before & after pictures. Nevertheless, I was really impressed how the serum changed my skin and made it so much better in various aspects. When I saw that there was a new version of this I was most excited lớn try this new OST C20 Pure vi-ta-min C21.5 Advanced Serum. And, as you might guess I had high expectations for this serum. Could it hold up khổng lồ them?


As with the previous serum the cardboard box comes with a lot of description in Korean và in English. It is very detailled in how to use it & what precautions lớn take. The new serum has even more details in English, than the previous packaging. The ingredient list of the new formula is very short. You can look them up on COSDNA and you’ll discover that the ingredients are safe to lớn use và that there is no artificial ingredient either. The ingredients of the old serum were safe to use, too, but the menu of substances is much longer as you can look up >>here


The dropper makes it very easy to lớn take out the watery & runny product. The OST C20 Pure vitamin C21.5 Advanced Serum has a clear color, which is also a sign that the vitamin C serum is fresh. If it turns yellow the vitamin in the bottle has started khổng lồ oxidize. The scent of the product reminds me a bit of oranges, but with a different scent combined, which I cannot figure out. The scent is not strong & doesn’t linger on the skin, so it doesn’t matter anyways.


Did the new OST C20 Pure vitamin C21.5 Advanced Serum fulfill my expectations? I’m not sure. Somehow I have the feeling that the old formula was more effective. I remember with the old formula, that I felt a stinging experience the first times I used it. I didn’t have any feeling like this for the new formula. Maybe, this new formula is better suited lớn sensitive skintypes than the old one. I could observe a decreased redness in my face, but I cannot assure that it is only due to lớn the new vitamin C serum, but it will be a combination of my skincare routine as a whole. Maybe if I repurchased this serum I would go for the old version, just because I had the feeling it worked better for me (and lớn confirm my observation). I can recommend you lớn try this new formula of the C20 if you were unhappy with the previous ingredients. This formula is almost completely different and doesn’t contains any parabens or other artificial ingredients. It doesn’t contain alcohol either. The old formula does have some cons, like the extreme stickiness & the ingredients, but I would not claim that the new formula shows better results, even with a higher concentration of vi-ta-min C. Both serum, the old and the new version can be purchased at Wishtrend. The old OST Original Pure vi-ta-min C20 comes with không tính phí shipping & retails for 14.99 US$ at the moment, which is really affordable for a vi-ta-min C serum. The new OST C20 Pure vitamin C21.5 Advanced Serum retails for 24.99 US$. Both bottles contain 30 ml. I made a post about the promotions from Wishtrend for March >>here



Just as a short reminder: All products mentioned and reviewed on this blog are of my personal opinions. This product here was sent to lớn me for reviewing purpose by, which doesn’t influence me in providing my honest opinion on the products.