Medik8 C-Tetra Vitamin C Serum

Medik8

Medik8 C-Tetra Vitamin C Serum

4.8(1,200 ratings)from retailer data

Key Features

  • 20% vitamin C with Phyto Exosomes
  • Per the brand: visible brightening and skin smoothing
  • Per the brand: lightweight, non-greasy formula
  • Antioxidant defense per the brand
  • Formulated for all skin types per the brand

This is a gel-serum from Medik8 that contains 20% vitamin C alongside Phyto Exosomes. The brand describes it as a lightweight, non-greasy formula designed to deliver visible brightening, skin smoothing, and daily antioxidant defense.

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From

$70.00

at Sephora · also stocked at 1 other retailer

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Last price update was: Sep 11, 2026, 4:46 AM

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Highlights

Description

This is a gel-serum from Medik8 that contains 20% vitamin C alongside Phyto Exosomes. The brand describes it as a lightweight, non-greasy formula designed to deliver visible brightening, skin smoothing, and daily antioxidant defense. Vitamin C is an antioxidant that helps protect skin, while hyaluronic acid and squalane oil provide hydration and nourishment.

Per the brand, this serum targets the visible signs of premature aging, hyperpigmentation, and wrinkles. The brand positions C-Tetra as suitable for all skin types, making it an option regardless of your skin's baseline state. The lightweight formulation means it can be layered into most routines without heaviness or visible residue on the skin.

If you have sensitive or reactive skin, patch-test first to ensure your skin tolerates the formula well.

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How to use

  1. Apply a small amount to clean, dry skin
  2. Gently pat or press into the face and neck
  3. Allow to absorb before applying other products
  4. Follow application instructions on the product label

Good to know

  • The brand positions this serum for all skin types
  • Vitamin C serums can increase photosensitivity, so daily SPF is essential
  • This works well as an early step in your routine before heavier creams
  • Hyaluronic acid and squalane oil provide hydration alongside the vitamin C
  • Patch-test first if you have sensitive or reactive skin
  • FSA and HSA eligible

FAQs

What does this serum contain?

C-Tetra combines 20% vitamin C with Phyto Exosomes, hyaluronic acid (a humectant that attracts water), and squalane oil (an emollient that softens and protects the skin barrier).

What skin types can use this?

Per the brand, it is formulated for all skin types.

Is this product FSA or HSA eligible?

Yes, this serum is eligible for FSA and HSA spending accounts.

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