Geek & Gorgeous C-Glow 15% Vitamin C Serum — Efficacy 4.3/5.0, Safety 4.5/5.0 | DemythSkin
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[ DemythSkin Verdict ]
Geek & Gorgeous C-Glow 15% Vitamin C Serum
Geek

Geek & Gorgeous C-Glow 15% Vitamin C Serum

SerumBrightening
Efficacy
Strong
4.3 / 5.0
Safety
Safe
4.5 / 5.0
System Verdict
This is a clinically strong, no-frills vitamin C workhorse with excellent chemistry and zero fluff. The efficacy score is high because it uses 15% pure L-ascorbic acid at the sweet-spot concentration, supported by ferulic acid and vitamin E in a classic antioxidant trio, plus dimethyl isosorbide to improve penetration and stability—there are no barrier or hydrating extras, but as a focused treatment serum for antioxidant protection and brightening, the formulation is technically optimal for its purpose.
Active Ingredients Detected
S Tier: Gold StandardsHigh Clinical Proof | Skin-Transformative
(L-)Ascorbic Acid
A Tier: Good BasicsProven Results
Ferulic AcidTocopherol
B Tier: Supporting IngredientsPromising Ingredients
Dimethyl Isosorbide
What Each Ingredient Does
Aqua (Water)
Solvent base
(L-)Ascorbic Acid
Antioxidant, brightening active
Dimethyl Isosorbide
Solvent, penetration enhancer
Butylene Glycol
Humectant and solvent
PEG/PPG/Polybutylene Glycol-8/5/3 Glycerin
Humectant, texture modifier
Ferulic Acid
Antioxidant, stabilizer
Tocopherol
Antioxidant (vitamin E)
Phenoxyethanol
Preservative
Ethylhexylglycerin
Preservative booster
Sodium Hydroxide
pH adjuster
Full Ingredient List (INCI)

Aqua (Water), (L-)Ascorbic Acid, Dimethyl Isosorbide, Butylene Glycol, PEG/PPG/Polybutylene Glycol-8/5/3 Glycerin, Ferulic Acid, Tocopherol, Phenoxyethanol, Ethylhexylglycerin, Sodium Hydroxide

Frequently Asked

Is Geek & Gorgeous C-Glow 15% Vitamin C Serum worth it?

Geek & Gorgeous C-Glow 15% Vitamin C Serum scores 4.3 out of 5.0 for efficacy (Strong) and 4.5 out of 5.0 for safety (Safe) on DemythSkin's independent ingredient analysis. This is a clinically strong, no-frills vitamin C workhorse with excellent chemistry and zero fluff. The efficacy score is high because it uses 15% pure L-ascorbic acid at the sweet-spot concentration, supported by feruli

What are the key active ingredients in Geek & Gorgeous C-Glow 15% Vitamin C Serum?

Geek & Gorgeous C-Glow 15% Vitamin C Serum contains these gold-standard actives with strong clinical evidence: (L-)Ascorbic Acid.

Does Geek & Gorgeous C-Glow 15% Vitamin C Serum contain fragrance or known irritants?

DemythSkin's analysis found no flagged irritants in Geek & Gorgeous C-Glow 15% Vitamin C Serum. It scores 4.5 out of 5.0 for safety.

How is Geek & Gorgeous C-Glow 15% Vitamin C Serum scored?

DemythSkin grades every product on two independent axes: efficacy (whether the ingredients have clinical evidence of working) and safety (irritation and sensitisation risk). Ingredients are classified S through D against a database of over 3,000 compounds. No brand pays for a score.

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Analysis last updated: 2026-07-30. DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score. DemythSkin earns commission from affiliate links (Amazon Associates and others). Scores are computed before any commercial relationship — the link follows the verdict, never the other way around.