Vitamin ReviewsVitamin CThis vitamin C serum brightened my skin, evened tone, and worked perfectly with my resilient skincare routine!

This vitamin C serum brightened my skin, evened tone, and worked perfectly with my resilient skincare routine!

2025-09-07 Vitamin Reviews Categroy:Vitamin C Views:66


I use this vitamin C serum with glycolic acid and tretinoin—my ultra-resilient skin glows brighter, stays even-toned, and handles the strong formula effortlessly. Worth the odd smell!


This is a review of product:


COSRX Pure Vitamin C 23% Serum with Vitamin E & Hyaluronic Acid, Brightening & Hydrating Facial Serum for Fine Lines, Uneven Skin Tone & Dull Skin, 0.7oz/20g, Korean Skin Care


From Amazon.com


My Honest Review: Vitamin C Serum That Brightens Skin Despite the Smell


My skincare routine:


1. Double wash, first with micellar water then with water-based cleanser.


2. Microneedling 2-3x a week


3. 12% glycolic acid toner


4. COSRX Vitamin C serum


5. 0.14% tretinoin cream


6. 8% hydroquinone cream


7. Ceramide moisturizer


8. Sunscreen, mornings


This is NOT for everybody. My skin is ultra-resilient and nothing ever irritates it. The Vitamin C serum really stinks, but it’s worth it. My skin is noticeably brighter and more even. Highly recommended!


Vitamin Basics & Tips


Skincare Routine Breakdown & Vitamin C Insights


Double Cleansing: Micellar water removes makeup/sunscreen, followed by a water-based cleanser to clear pores. Ideal for prepping skin for actives like vitamin C.


Microneedling: Enhances product absorption. Avoid combining with vitamin C immediately post-treatment to prevent irritation.


Glycolic Acid (12%): An AHA that exfoliates, boosts cell turnover, and complements vitamin C's brightening effects. Use cautiously to avoid over-exfoliation.


Vitamin C Serum (L-ascorbic acid): A potent antioxidant that fights free radicals, boosts collagen, and reduces hyperpigmentation. Stability varies—store in cool, dark places.


Tretinoin (0.14%): A retinoid that accelerates cell renewal. Pairing with vitamin C may enhance anti-aging benefits but requires robust skin tolerance.


Hydroquinone (8%): Targets stubborn pigmentation. Use cyclically (4-6 weeks) and avoid combining with vitamin C in the same routine to prevent irritation.


Ceramides & Sunscreen: Ceramide moisturizers strengthen the skin barrier, while sunscreen (SPF 30+) is non-negotiable—vitamin C increases sun sensitivity.


Vitamin C FAQs & Tips


Why does vitamin C serum smell? Oxidation causes a metallic/iron-like odor. Air-tight packaging and refrigeration slow this process.


Best time to apply: Morning (under sunscreen) boosts UV protection. Night use aids repair. Avoid layering with niacinamide or benzoyl peroxide unless formulated together.


For sensitive skin: Opt for gentler derivatives like sodium ascorbyl phosphate or tetrahexydecyl ascorbate.


Shelf life: 3-6 months. Discard if serum turns dark yellow/brown.



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Tags: vitamin c serum brightening skincare glycolic acid toner skincare routine antioxidant protection


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