Why do we need an antioxidant?
How does vitamin C serum get into the skin?
Is vitamin c serum compatible with the sun?
Can vitamin c serum be applied to all skin types?
Is vitamin c compatible with another active ingredient?
Does a highly concentrated vitamin C serum systematically cause irritation?

Click here to read all answer to these questions: https://skincare-expert1.blogspot.com/2021/06/vitamin-c-serum-faq.html