goop 20% Vitamin C Brightening Serum 1 fl oz — Powder‑Activated L‑Ascorbic Acid, Hydrating & Fast‑Absorbing

goop Beauty 20% Vitamin C + Advanced Brightening Serum is a powder-activated, high-concentration L-ascorbic acid serum designed to brighten, hydrate, and help improve skin tone and texture.

This daily brightening serum blends a potent 20% L-ascorbic acid dose with ferulic acid, hyaluronic acid, and ectoin to deliver antioxidants and hydration in a lightweight, fast-absorbing formula. The product arrives in two parts: a stable amber bottle of L-ascorbic acid powder plus a liquid activator to mix immediately before first use, limiting oxidation and preserving efficacy.

How does the powder-activated system work and why does it matter?

The two-part design keeps L-ascorbic acid stable until activation, helping the vitamin C remain potent when you use it. You pour the liquid activator into the amber bottle with the powder and shake; the amber glass helps minimize light exposure after activation.

• 20% pure L-ascorbic acid powder activated with a liquid for freshness
• Amber glass bottle reduces UV exposure to protect the mixed serum
• Shake to combine; ready to apply morning and night

What skin benefits can I expect from this serum?

This formula combines antioxidant support with hydration and barrier protection to address dullness, uneven tone, and the appearance of texture. While results vary, clinical measurements in a small study reported improved radiance after regular twice-daily use over several weeks.

• Antioxidant blend: L-ascorbic acid and ferulic acid for free-radical defense
• Hydration: hyaluronic acid helps skin feel plumper and smoother
• Barrier support: ectoin helps retain moisture and soothe skin

Is the serum heavy or suitable under makeup?

The texture is water-light and designed to absorb quickly without tackiness, making it easy to layer under moisturizers and sunscreen. A few drops spread across face and neck, leaving a smooth base for subsequent products.

• Weightless finish—no greasy residue
• Fast absorption enables easy layering with other products
• Recommended application: a few drops to face and neck, morning and night

How should I use and store the activated serum safely?

Activate the powder with the included liquid activator right before first use, then store the amber bottle in a cool, dry place away from direct sunlight. Apply sunscreen during daytime use to protect skin after applying antioxidant treatments.

• Combine activator into powder bottle and shake to mix
• Store amber bottle upright, away from heat and direct light
• Use morning and night; follow with moisturizer and daytime SPF

Who is this for: This serum is aimed at anyone seeking a high-strength vitamin C treatment to address dullness, uneven tone, and visible texture while also wanting hydrating and barrier-supporting ingredients. It suits people comfortable with a powder-activation step and those who prefer fast-absorbing, non-greasy serums; if you have very sensitive skin, patch testing before full-face use is recommended.

Key features:

• 20% L-ascorbic acid (pure vitamin C)
• Antioxidant ferulic acid plus hydrating hyaluronic acid
• Ectoin for barrier support and moisture retention
• Lightweight, non-tacky texture; amber glass to limit UV exposure
• Clinical improvement in radiance reported after regular use in a small study

Ingredients

AQUA/WATER/EAU, ASCORBIC ACID, GLYCERIN, DIMETHYL ISOSORBIDE, PENTYLENE GLYCOL, ECTOIN, PROPANEDIOL, FERULIC ACID, SODIUM HYALURONATE, TERMINALIA FERDINANDIANA (KAKADU PLUM) FRUIT EXTRACT, GALACTOARABINAN, SODIUM CITRATE, ZIZIPHUS JUJUBA (JUJUBE) SEED EXTRACT, FRUCTAN, ETHYLHEXYLGLYCERIN, POTASSIUM SORBATE, DECYL GLUCOSIDE, OLEA EUROPAEA (OLIVE) LEAF EXTRACT, SODIUM HYDROXIDE, CITRIC ACID, PHENETHYL ALCOHOL, XYLITOL, CAPRYLIC ACID, CAPRYLYL GLYCOL.