Prequel Lucent-C Brightening Vitamin C Serum — Efficacy 4.2/5.0, Safety 4.4/5.0 | DemythSkin
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[ DemythSkin Verdict ]
Prequel Lucent-C Brightening Vitamin C Serum
Prequel

Prequel Lucent-C Brightening Vitamin C Serum

SerumBrightening
Efficacy
Strong
4.2 / 5.0
Safety
Safe
4.4 / 5.0
System Verdict
This is a legitimately strong vitamin C serum, not a hype bottle. The efficacy score is high because 15% L-ascorbic acid sits near the top of the list, and the formula adds ferulic acid plus ergothioneine to support antioxidant stability and performance; niacinamide and humectants add secondary support, while the main limitation is that this kind of low-pH L-ascorbic acid system can be irritating for sensitive skin and depends on proper formulation rather than a long list of extras.
Active Ingredients Detected
S Tier: Gold StandardsHigh Clinical Proof | Skin-Transformative
Ascorbic Acid
A Tier: Good BasicsProven Results
Ferulic AcidNiacinamide
B Tier: Supporting IngredientsPromising Ingredients
EthoxydiglycolIsopentyldiolErgothioneineInulinHydroxyacetophenoneMannitol
What Each Ingredient Does
Water (Aqua)
solvent, formula base
Propanediol
solvent, humectant
Ascorbic Acid
primary vitamin C active
Ethoxydiglycol
solvent, penetration aid
Isopentyldiol
solvent, humectant
Ferulic Acid
antioxidant stabilizer
Ergothioneine
antioxidant support
Inulin
humectant, prebiotic support
Niacinamide
barrier support, brightening
Hydroxyacetophenone
antioxidant, preservative booster
Aminomethyl Propanol
pH adjuster
1,2-Hexanediol
solvent, preservative booster
Caprylyl Glycol
humectant, preservative booster
Mannitol
humectant, antioxidant support
Full Ingredient List (INCI)

Water (Aqua), Propanediol, Ascorbic Acid, Ethoxydiglycol, Isopentyldiol, Ferulic Acid, Ergothioneine, Inulin, Niacinamide, Hydroxyacetophenone, Aminomethyl Propanol, 1,2-Hexanediol, Caprylyl Glycol, Mannitol

Frequently Asked

Is Prequel Lucent-C Brightening Vitamin C Serum worth it?

Prequel Lucent-C Brightening Vitamin C Serum scores 4.2 out of 5.0 for efficacy (Strong) and 4.4 out of 5.0 for safety (Safe) on DemythSkin's independent ingredient analysis. This is a legitimately strong vitamin C serum, not a hype bottle. The efficacy score is high because 15% L-ascorbic acid sits near the top of the list, and the formula adds ferulic acid plus ergothioneine to support anti

What are the key active ingredients in Prequel Lucent-C Brightening Vitamin C Serum?

Prequel Lucent-C Brightening Vitamin C Serum contains these gold-standard actives with strong clinical evidence: Ascorbic Acid.

Does Prequel Lucent-C Brightening Vitamin C Serum contain fragrance or known irritants?

DemythSkin's analysis found no flagged irritants in Prequel Lucent-C Brightening Vitamin C Serum. It scores 4.4 out of 5.0 for safety.

How is Prequel Lucent-C Brightening 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.

Analyze on DemythSkin →

Analysis last updated: 2026-10-02. DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score.