(4 customer reviews)

KD Brighten & Tighten Vitamin C Serum (1 fl oz)

This brightening and hydrating vitamin C serum delivers skin-enhancing combination of fruit-based acids and nutrients to achieve improved skin texture and tone resulting in healthier-looking skin. Delivered through a controlled time-release system instant, continuous, and optimized penetration.

Excellent addition to any skincare regimen!

$85.00 $68.00


Directions: Massage a thin layer over the desired area once or twice daily or as directed by your physician.


Overall Features

  • A physician strength vitamin c serum
  • More potent than any drugstore brand
  • Fragrance & Paraben free
  • Improves appearance of dark spots
  • Melasma, and acne scarring
  • Non-hydroquinone brighten effects



  • Penetrating ascorbate blend, arbutin, emblica, bearberry, citrus terpenes
  • Supports healthy collagen production
  • Helps guard against free-radicals and moisturizes
  • Maintains potency and stability, allowing maximum penetration and absorption over time



Methyltrimethicone, Cyclopentasiloxane, Trimethylsiloxysilicate, Tetrahexyldecyl, Ascorbate, Dimethiconol, Ascorbyl Glucoside, Ascorbic Acid, Arbutin, Phyllanthus, Emblicaextract, Ascorbic Acid/Orange/Citruslimon/Citrus, Auranti Folia Polypeptides, Arctostaphylos, Uva Ursi (Bearberry) Leaf Extract, Ascorbyl, Palmitate, Purified Water, Citrus Terpenes, Phospholipids, Tocopheryl Acetate, Retinyl Palmitate, Superoxidedismutase, Ubiquinone, Phenoxyethanol.

4 reviews for KD Brighten & Tighten Vitamin C Serum (1 fl oz)

  1. Kara Kiely (verified owner)

    So I never write reviews however this product most definitely deserves one! I have been following dr Kay on Instagram and have listened to her podcasts for a while now. Her work is amazing and her advice and tips on her podcast are so informative! So I decided to try some products from her line ( perfecting polish, day cream and this vitamin C serum) and I absolutely love everything! This one in particular I feel has made such a difference in my skins appearance and texture. My skin is smoother brighter and Firmer! I also have noticed I don’t get any type of breakouts like I normally would here in there Which is a bonus! I also just received my second purchase of deep blue hydration serum and the diamond line refine yesterday and I’m super excited to start adding them in my routine! Highly recommend these products! Thank you dr Kay!

  2. Hye H. (verified owner)

    I absolutely love this serum! The combination of the Glycolic Acid Cleanser, Deep Blue Hydration, Brightening Pads and this serum has made my skin smoother and brighter. Can’t wait to try the other products!

  3. Zuleika Javed (verified owner)

    I usually don’t review products, but Dr. Kay’s skincare line is exquisite, effective and comes with the right price point to maintain. I have been getting many compliments at work and events on how youthful and glowy my skin is. I have been recommending to everyone that has been commenting on my skin.

  4. Megan Jafari (verified owner)

    i’m using vitamin C serum since 2 years ago and i’m in love with it. My skin feels tight, bright, and the size of my pores get smaller!
    Thank you Dr Kay❤️

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