Advanced The Vitamin C 23 Serum with Super Vitamin E & Hyaluronic Acid vs 15% Vitamin C Bright Cell™ Serum with N.A.D + Complex — Ingredient Comparison

COSRX

Advanced The Vitamin C 23 Serum with Super Vitamin E & Hyaluronic Acid

Serum · 34 ingredients · South Korea

COSRX Advanced The Vitamin C 23 Serum returns renewed with improved stability and a gentler, smoother texture. Brightens dark spots and boosts radiance with concentrated 23% vitamin C.

Youth To The People

15% Vitamin C Bright Cell™ Serum with N.A.D + Complex

Serum · 30 ingredients

A brightening serum that targets uneven texture, dark spots, and a compromised skin barrier using a concentrated blend of actives. THD Ascorbate, a stable form of vitamin C, works to visibly brighten skin tone, while the N.A.D.+ Complex — niacinamide, adenosine, and D-ribose — addresses visible signs of fatigue. Antioxidant-rich superfruit oils and extracts round out the formula by defending against visible signs of aging.

Vegan

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How these two interact

No conflicts — safe to layer

Both are Serum products.

At a glance

Vegan

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Price

$20

$35 less

$55

Key ingredients

L-Ascorbic Acid

A form of vitamin C — an antioxidant that brightens, fades dark spots, and supports collagen.

Niacinamide

Strengthens the barrier, controls oil, and fades dark spots — gentle and plays well with almost everything.

Hyaluronic Acid

Holds water in the skin for instant plumping and hydration.

Squalane

A lightweight, biomimetic oil that softens without clogging pores — pairs perfectly with strong actives to offset dryness.

Vitamin E

An antioxidant that protects the barrier and supercharges vitamin C.

Ascorbic Acid(23%)

A form of vitamin C — an antioxidant that brightens, fades dark spots, and supports collagen.

Panthenol (B5)

A barrier-repairing humectant that hydrates and calms — a sensitive-skin staple.

Caffeine

An antioxidant that temporarily de-puffs and tightens — popular around the eyes.

Glutathione

An antioxidant brightener that supports a more even tone.

Adenosine

A cell-signaling ingredient that smooths fine lines and supports firmer skin.

Allantoin

Calms redness and smooths texture — buffers harsh actives beautifully.

Elaeis Guineensis (Palm) Oil