Prequel Lucent-C Brightening Vitamin C Serum — Efficacy 4.2/5.0, Safety 4.6/5.0 | 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
4.6 / 5.0
System Verdict
This is a lean, clinic-style vitamin C serum that focuses almost entirely on delivering 15% L-ascorbic acid at the right pH with smart antioxidant partners — it’s built to work, not to look fancy. The high efficacy score comes from genuine gold-standard L-ascorbic acid at 15%, an acidic pH around 3.2 that maximizes penetration, and a co-antioxidant system (ferulic acid ~0.5%, ergothioneine, niacinamide) that improves stability, brightening, and photoprotective synergy, all in a fast-penetrating, mostly solvent-humectant base with no fragrance and minimal filler. There are no unstable vitamin C derivatives, no jar packaging, and no marketing-only idol ingredients — the formula is ruthlessly optimized around well-studied actives and delivery conditions.
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)
Primary solvent
Propanediol
Solvent and humectant
Ascorbic Acid
Vitamin C antioxidant brightener
Ethoxydiglycol
Solvent and penetration enhancer
Isopentyldiol
Humectant and emollient solvent
Ferulic Acid
Antioxidant and vitamin C stabilizer
Ergothioneine
Antioxidant co-factor
Inulin
Prebiotic, texture and conditioning
Niacinamide
Brightening, barrier-supporting vitamin B3
Hydroxyacetophenone
Antioxidant preservative helper
Aminomethyl Propanol
pH adjuster / buffering agent
1,2-Hexanediol
Solvent and preservative booster
Caprylyl Glycol
Humectant and preservative booster
Mannitol
Humectant and antioxidant co‑factor
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 4.6 out of 5.0 for safety (Safe) on DemythSkin's independent ingredient analysis. This is a lean, clinic-style vitamin C serum that focuses almost entirely on delivering 15% L-ascorbic acid at the right pH with smart antioxidant partners — it’s built to work, not to look fancy. The high efficacy score

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 4.6 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: 2026-08-01. DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score.