You don't need a supplement if you get vitamin C from your foods. Also, topical vitamin C does have studies backing its efficacy. Here's one of many studies. I personally like the Timeless vit C+E+ferulic acid serum; I've had a lot of success over the years reducing post-inflammatory erythema from acne.
Storing the serum. Storing a vitamin C serum properly becomes necessary to keep it from oxidising. Dr Ankur Sarin and Dr Jushya Sarin Co-Founders of Sarin Skin Solutions weigh in. They say, “A vitamin C serum in an amber bottle is preferable. Keep it away from direct sunlight and screw back the bottle cap tight after usage.”
For best results, you should use your vitamin C serum as early as possible in your routine. You can use it, for example, right after cleansing your skin (or, if you use a toner, right after toning). Moisturizers should always come after your vitamin C serum. Finally, if it’s daytime, don’t forget to use sunscreen!

This face serum includes skin-brightening vitamin C and acne-fighting salicylic acid to increase radiance, minimize large pores, brighten and even skin tone. Apply it to clean skin and follow up with L’Oréal Paris Revitalift Derm Intensives 1.5% Pure Hyaluronic Acid Serum for extra hydration. 3. To Plump and Hydrate Your Skin.

7. PURA D’OR 20% Vitamin C Serum is a lightweight, maximum-strength formula suitable for men and women. It is designed to treat the skin around the face and eyes, with special attention given to It helps trigger the skin’s regeneration process naturally to repair the damaged skin cells. Some of the most common benefits of Vitamin C serum include the following: Offers hydration to the skin. Brightens dark marks and improves pigmentation. Reduces redness and evens out the skin tone. Lessens the appearance of dark under-eye circles. Abstract. Vitamin C (L-ascorbic acid) has been known as an antioxidant for most people. However, its physiological role is much larger and encompasses very different processes ranging from facilitation of iron absorption through involvement in hormones and carnitine synthesis for important roles in epigenetic processes. There are now tons of skincare products with vitamin C touting beneficial effects for collagen production. You can find vitamin C in face wash, lotion, toner, and just pure vitamin C serum. A study looked at how effective topically applied vitamin C was on skin aging in 60 healthy women, compared to a placebo (7). Additionally, vitamin C serums help hydrate the skin by increasing the amount of water that binds to its surface, which increases suppleness and reduces roughness. 7. Balanced Oil Production. Even if you don’t have oily skin, you can still benefit from using a vitamin C serum to help balance oil production. Vitamin C serum is concentrated, which means a few drops or one pump from the container is usually enough to cover the whole face and neck. Vitamin C is an important factor in promoting skin
First layer vitamin C, then add your EGF serum, then sunscreen.” Why Is Vitamin C So Important For Skin Protection? Studies have shown that using an antioxidant vitamin C serum prior to sunscreen can optimize your SPF, addressing damage from the sun and pollutants by neutralizing free radicals before exposure. According to that study
Why Vitamin C Should Be Paired With Sunscreen. "Combining vitamin C serum and broad-spectrum sunscreens that protect well against UVA rays has been shown to be more effective at neutralizing free radical damage from sun exposure than just using sunscreen alone," Mandrea says. According to this study from 2013: "Sunscreens block only 55 percent Skintreats Vitamin-C Serum. $24. 4. Treat Those Blemishes. Exfoliating the skin and keeping pores clear of dirt debris is key for acne-prone skin. But when breakouts do happen, Dr. Mehr suggests
One study even recommends applying a vitamin C serum every eight hours, or twice daily for the pinnacle of protection. Vitamin C has photoprotective properties and staves off oxidative
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    • is vitamin c serum necessary