Disclaimer:
This review contains affiliate links.
It is not a sponsored review and is my true and honest opinion and results of the product.
Why do I need a vitamin C serum?
Serum’s are the new hot item in skincare and a must have in every morning and night time routine. We now find our selfs looking for serum and products that contain Vitamin C that will help even out ourย skin tone. Vitamin Cย serums are great for fading post acne scars, sun spots, pigmentation and even help to fight against acne.
Today I am going to share my review on the new formula of the OST Pure Vitamin C 21.5 Advanced Serum. The upgrade of the OST Pure Vitamin C 20 Serum. You can view my previous review of the old formula by clicking here.
*NOTE: This review is old. The product is now called the ByWishtrend Pure Vitamin C21.5 Advanced Serum, however, the formula is the exact same!*
ByWishtrend Pure Vitamin C21.5 Advanced Serum Review
Serums that contain high concentrates of vitamin C aren’t always the most pleasant to use. The number 1 issue is the texture of the serum being too sticky. Overly sticky serums block the absorption of additional layered skincare products, limiting their effects and overall be uncomfortable and unpleasant to use.
You can tellย how sticky a serum may be by seeing how thick the consistency of it is. As shown above, the vitamin c 21.5 serum travels at a medium rate down the surface of my skin. Just slow enough to give me enough time to click the shuttle button on my camera before the serum disappeared down my skin.
Texture & Comparison
The second way to compare which product is more sticky is to apply any type of powder substance on top of the applied serum.
In the above photo, I placed sugar overย vitamin c serum. I used 3 drops of serum on the skin beforehand. After shaking off the sugar, you can see almost all the sugar was easily removed from the skin where the serum was applied.
Will it fade my Acne Scars?
Let’s test and see how the ByWishtrend Pure Vitamin C 21.5 Serum affected my acne scars over the time span of 10 days of use.
The serum applied smoothly and absorbed quickly into the skin with a slightly tacky texture that faded after 1 minute. When first applied, I felt a slight tingling and burning sensation. After a few seconds, the sensation went away. I then wait 15 minutes before applying any additional product to make sure the serum was fully absorbing into my skin without being diluted.
Over the time span of 10 days, I did not experience any skin irritations.
No hives, no itching, no burning and no redness!
My skin actually improved very quickly in only 10 days of use. The redness in my cheeks improved, my pores appeared tighter and my acne scars started to heal very quickly!
I was very shocked at how quickly this serum worked for me in comparison to the old OST C 20 formula.
What makes me the happiest about this new formula?
The small number of ingredients used. Making the ByWishtrend Pure Vitamin C 21.5 Advanced Serum much less sticky and less irritating to anyone with sensitive skin.
Overall
Based on my personal results with the OST C 21.5 Advanced serum, I would choose this vitamin c serum over the old OST C 20 Serum as it did not cause me any irritations and provided my skin with the results I was hoping for out of a vitamin serum.
The new ByWishtrend Vitamin C serum is something I highly recommend to includeย in anyone’s skincare routine who is looking for aย Vitamin Cย product that is less likely to cause irritation and will improve the appearance of post acne scars fast and other skin pigmentation concerns.
Check out the new and improved ByWishtrend Pure Vitamin C 21.5 Advanced Serumย at Wishtrend
ย :: Getย It Hereย ::
PINย It!
42 Comments
Frl. Schnee
February 12, 2015 at 6:44 pmThe before and after effect really shows some improvement. I’m happy they changed the formula to a less sticky one, because with the old OST20 this was my main problem. I had to mix it with moisturizer so it was at least a bit less sticky.
biibiibeauty
February 13, 2015 at 1:30 amI was shocked by the improvements. I didn’t notice how fast it worked until I compared the photos. I am super happy with this serum! ๐
Jolanda
February 16, 2015 at 5:50 pmThank you so much for this in depth review. I’ve had my eye on this serum for a wee while now and I will definitely purchase it now I know it works so well! Thanks again! xx
biibiibeauty
February 17, 2015 at 2:04 amI’m happy the review was helpful to you! ๐
BeautySushi
February 16, 2015 at 8:57 pmWhoa!!! The difference between before and after really shows!
This product really seems worth a try! I don’t have acne but my friend does, I’ll recommend it to her >. beautisushi.blogspot.com/
biibiibeauty
February 17, 2015 at 2:03 amI know right! I couldn’t believe it either! ๐
Sora
July 16, 2015 at 7:52 pmOne question, did you use it all over your face? because in various sites it says it shouldn’t be used all over, but rather as a spot treatment for PIH, so I don’t know which I should buy.
Thanks!
biibiibeauty
July 17, 2015 at 1:40 amI apply is all over my face. But I avoid the eye area. If your have PIH, then you can use an additional drop and apply it to targeted areas that need extra help.
Lia
August 12, 2015 at 6:25 pmFor reducing acne scars, brightening skin, and evening over skin tone and complexion, would you recommend OST C 21.5 SERUM or the Klairs Freshly Juiced Vitamin Drop Serum?
biibiibeauty
August 13, 2015 at 3:58 amHi Lia,
For fast results, C21.5 is the best choice. However take into consideration, with is 21.5% VS 5% vitamin C, it is prone to faster expiration and can cause skin sensitivity. If you have never sensitive skin, then Klairs would be best. If you skin is not very sensitive or is okay with Vitamin C products, then C21.5 is best ๐ Klairs is more of a gentle brightening and mostly an anti-aging anti-oxidant product. While C21.5 is more for whitening and scar healing as well as anti-oxidant.
Kin
August 7, 2017 at 3:17 amHi, is this good for hyperpigmentations like melasma/colasma? I have been wanting to remove the melasma from my cheeks that has started to come post pregnancy. Thanks for your response!
Bronwyn Papineau (BiiBiiBeauty)
June 18, 2018 at 1:18 pmSorry but I am not 100% sure if it would help those skin conditions or not. But I’d say it’s worth a try.
Lily
September 23, 2015 at 2:27 amI have a really oily acne prone skin type! Can i use this? what other things would you recommend me. To clear my acne and for scars to fade away. Thanks
biibiibeauty
September 23, 2015 at 6:46 amYes you can use it ๐
Lily
September 24, 2015 at 1:55 amThank you for your response. I forgot to mention this but i checked your skin routine video and was interested in few things that you mentioned.
My skin is really oily so, would the products mentioned below be ok for my skin?
1. Cosrx Bha Blackhead Power Liquid 100 Ml
2. Cure Natural Aqua Gel 250ml
3. Missha Time Revolution Night Repair Science Activator Ampoule SeRum
Thank you once again:)
biibiibeauty
September 24, 2015 at 2:47 amYes!
All the products are okay for oily skin types as well ๐
aria
September 27, 2015 at 2:26 amis this a morning serum or night serum?
biibiibeauty
September 30, 2015 at 9:37 amBoth. Just make sure you start using a sun cream when using vitamin c in your routine. Vitamin c make your skin more prone to sun damage all year round.
aria
September 27, 2015 at 2:41 ami see that Missha Time Revolution Night Repair Science Activator Ampoule Serum can be used both day and night. Can you tell me whether the 21.5 serum is a day serum or night? And if you had to pick one serum from these two, which one would you pick?
biibiibeauty
September 30, 2015 at 9:38 amYes, you can use it day or night, just make sure you use a sun cream when you use this product in your routine as it has ingredients that make the skin more prone to sun damage. Use the 2 serums at different times. I use vit c during the day with sun cream and missha at night. If your looking to get rid of scars, use vit c. if your looking for an all around skin repair and anti aging serum, use missha.
Mary
October 7, 2015 at 10:41 amHi, I still have active acne and lots of acne scars, is the vit c suitable for me? Will it cause more breakouts initially?
biibiibeauty
October 27, 2015 at 3:53 amYes, it is a good product to help skin healing ๐
Engelia soei
November 5, 2015 at 1:51 amHow often do you use the serum? Do you use it everyday?
biibiibeauty
November 8, 2015 at 5:29 pmevery night ๐
tanzin
November 25, 2015 at 1:13 pmhi can i use it with retinol A(isotretinoin) together or separately?????? is it effective for oily dark coloured asian skin??????
biibiibeauty
November 25, 2015 at 6:02 pmStart by using them separately or patch testing them together. ๐
Wendy
January 9, 2016 at 8:19 amThanks for the review-! I got mine in the mail about 3 days ago and started to use it every night. But today, i noticed some white stuff near the cap. It looked like mold to me but I read somewhere that it could be vitamin c crystallized. Should I be worried about this or is it fine to keep using it? Thank you in advance ๐
biibiibeauty
January 15, 2016 at 5:14 pmHi,
That is normal crystallization ๐ This can occur around the cap and sometimes in the dropper.
Jessica
January 24, 2016 at 6:24 amMy skin it’s not extremely dry nor with a lot of acne. I do have small pores and blackheads. Can i still use it? I’m 20 years old. Is it good for fine lines?
David
February 14, 2016 at 12:28 amHi, can I use this vitamin C serum and mandelic acid together with salicylic products? What will happen? Thanks.
biibiibeauty
March 9, 2016 at 9:48 pmSure, just allow time for it to absorb before applying products overtop.
Patricia
April 5, 2016 at 3:21 amHi! big fan of yours from Toronto! I’m just wondering how do you use the serum? Reading from various online sources, some of them said you have to wait for 20 minutes after cleansing or apply it first before toner. So… I’m kind of confuse how to use this serum. What do you think it’s the right way?
biibiibeauty
July 9, 2016 at 4:14 amYou don’t have to wait that long. I never do and the results are the same as if i did. Just wait long enough for the serum to absorb ๐ The choice of how long you wait is up to you.
Aubri
February 28, 2017 at 2:04 amHi i have several question about this serum. Do we have to use low ph toner and cleanser when using this product? And if i want to use this only at night, do i have to use sunscreen in the morning? Thx!
Lily
June 19, 2017 at 5:44 pmI have a terrible pigmentation on my face, will it be effective for this? Such a mess! Want to get rid of it
Bronwyn Papineau (BiiBiiBeauty)
June 18, 2018 at 1:15 pmYes, it will be effective.
ben
September 10, 2017 at 6:07 pmwhich one you prefer between this one and the klairs vitamin drop?
Bronwyn Papineau (BiiBiiBeauty)
June 18, 2018 at 1:12 pmKlairs. My skin no longer needs an intensive vitamin C product. So a mild vitamin C does the trick just fine.
proxy list daily
September 30, 2017 at 11:54 amHi,I check your blogs named “OST C 21.5 SERUM REVIEW | OST Pure Vitamin C 21.5 Advanced Serum – BIIBIIBEAUTY – BRONWYN PAPINEAU BLOG” on a regular basis.Your writing style is witty, keep it up! And you can look our website about proxy list daily.