FAQ: By Wishtrend Vitamin C Serum, You Asked, Our CS Team Answered

by wishtrend on Aug 18, 2020

All your most frequently asked questions about the By Wishtrend Pure Vitamin C Serum Line, answered with the help of Wishtrend’s CS team. Whether you’re a long time user of vitamin C products, or on the search for your very first serum, this is the perfect guide to better understand the By Wishtrend Pure Vitamin C serum line to make the best choice.  If you have any further questions, please don’t hesitate and ask away via  

By Wishtrend Pure Vitamin C Serum

By Wishtrend Pure Vitamin C Insert Image By Wishtrend Pure Vitamin C 15% with Ferulic Acid
  1. Q. Are the By Wishtrend pure vitamin C serums dermatologist-approved? 

It’s important to keep in mind that the standards in which something is considered dermatologist-approved may differ from country to country. Because of this, it’s important to note the testing a product has undergone when it comes to determining whether or not a product is suitable for specific skin conditions. Both the By Wishtrend Pure Vitamin C 21.5% Advanced Serum and Pure Vitamin C 15% with Ferulic Acid have undergone a “primary skin irritation test”, ensuring its suitability for all skin types, even sensitive skin. 
  1. Q. I heard that vitamin C becomes less stable and potent when paired with water. Are the By Wishtrend vitamin C serums formulated with water, and if so, does this make them less effective? 

It’s true that vitamin C oxidizes when it comes in contact with oxygen, which is why vitamin C products formulated with water are expressed as being “less potent” or “less stable” due to the oxygen found in water molecules. However, oxidation is a natural occurrence in all vitamin C products. While water soluble solvents and oil bases exist as an alternative to a water base, many companies including ours choose to stick with a water base as alternatives do not mix well with vitamin C, nor do they absorb well into the skin. While the By Wishtrend Pure Vitamin C 15% with Ferulic Acid is formulated with water, this decision was made with product efficacy and skin safety in mind.  
  1. Q. My By Wishtrend Pure Vitamin C 15% with Ferulic Acid came with a loose cap. Did I receive a faulty product? 

Please rest assured that your serum is not faulty, and is still safe for use on the skin. However, we are collecting all your feedback and are working to update the cap for an improved usage experience.  
  1. Q. I read that the ideal pH for vitamin C serums ranges from 2 - 3.5. Does the By Wishtrend Pure Vitamin C serums have a pH level higher than this? 

The absorption of vitamin C is largely dependent on pH, which is why many sources will state the “ideal” pH range for vitamin C serums. You can rest assured that both the vitamin serums from By Wishtrend are formulated with the optimal pH level for effective absorption.  
  1. Q. Is the Pure Vitamin C 15% with Ferulic Acid formulated with L-ascorbic acid or a vitamin C derivative?

The Pure Vitamin C 15% with Ferulic Acid is formulated with L-ascorbic acid, making it effective in evening out the skin tone and reducing the appearance of signs of aging.  
  1. Q. What precautions should I take into consideration before using the Pure Vitamin C 21.5% Advanced Serum? 

Whether it’s your first time using the Pure Vitamin C 21.5% Advanced Serum, or you’re a long time veteran, there are a few things to note in order to safely and effectively incorporate a vitamin C serum into your skincare routine. As much as vitamin C is beneficial to the skin, it is a powerful ingredient. 

Application: Avoid sensitive areas surrounding the eyes and mouth, as well as open wounds. If you’re a first time user, you may experience a slight tingling sensation which is a natural phenomenon caused by the pH difference in the skin and vitamin C.


Ingredients to Use/ Avoid: Should you choose to use the serum during the morning, make sure to follow up with a sunscreen with an SPF of 15 or higher before leaving the house. Because vitamin C possesses mild exfoliative properties, we recommend avoiding using both physical and chemical exfoliators on the same day as the vitamin C serum, 


Storage: Vitamin C naturally oxidizes over time and is especially sensitive to air, light and temperature change. As this product contains high concentrations of pure Vitamin C, it’s best when used immediately after purchase for maximum effectiveness. 

  1. Q. I thought 20% is the maximum percentage that vitamin C is effective. Why does the By Wishtrend Pure Vitamin C 21.5% Advanced Serum contain more than 20% vitamin C? 

The idea that 20% is the maximum effective percentage is a common misconception. There are various new studies that prove that formulations containing higher than 20% vitamin C are equally as, or even more, effective. In addition, many research labs base their efficacy testing on pure vitamin C alone, while skincare products are formulated with additional ingredients that aid the absorption of said vitamin C. Because of this, please use research studies only as a reference point as there may be differences in what studies say, and the actual efficacy of a vitamin C serum. 
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