C E Ferulic

Name: SkinCeuticals C E Ferulic
Brand: SkinCeuticals
Price: 182.00 USD
Availability: InStock

The most clinically validated vitamin C serum ever produced. The Duke Patent formulation (15% L-ascorbic acid + 1% vitamin E + 0.5% ferulic acid at pH 2.5-3.5) has specific peer-reviewed evidence showing 8x photoprotection and significant collagen stimulation. Expensive, but the evidence is genuinely unmatched.

89/ 100

Biorank Score

Independently ranked

89/ 100

Biorank Score

Independently ranked by Biorank Laboratories

Our Verdict

Best in Class

SkinCeuticals C E Ferulic earns the highest skincare score because the specific formulation is directly supported by peer-reviewed research -- not ingredient extrapolation. The Duke Patent combination (C + E + Ferulic at the correct pH) is one of the most rigorously validated topical formulations in dermatology. No hype penalty because the marketing genuinely reflects the evidence. The value score is low due to $182/bottle pricing, but cheaper vitamin C serums often use different pH, concentrations, or forms that lack equivalent evidence.

Key Findings

Duke Patent formulation has specific peer-reviewed evidence (Pinnell 2001, Lin 2005)
C + E + Ferulic combination provides 8x photoprotection vs. UV alone
Most expensive product we rank but the evidence genuinely justifies the premium
L-ascorbic acid oxidizes in 2-3 months after opening -- storage matters

Evidence Analysis

SkinCeuticals C E Ferulic is based on the Duke Antioxidant Patent by Dr. Sheldon Pinnell, which identified the precise combination and pH required for L-ascorbic acid skin penetration. The landmark Pinnell 2001 paper established that L-ascorbic acid requires pH < 3.5 and >8% concentration for skin penetration. The Lin 2005 study demonstrated that adding ferulic acid to C+E doubles photoprotection from 4x to 8x versus UV alone. Subsequent studies confirm antioxidant protection, collagen stimulation, and hyperpigmentation reduction. This is not marketing -- the formulation is patented based on published research.

Ingredient Breakdown

Ingredient	Dose	Effective Dose	Verdict
L-Ascorbic Acid (Vitamin C)	15%	8-20% at pH < 3.5	Optimal
Vitamin E (Alpha-Tocopherol)	1%	1%	Optimal
Ferulic Acid	0.5%	0.5-1%	Optimal

True Cost Analysis

Properly Dosed -- What You Pay Is What You Get

Listed Price

$2.02/serving

$60.60/month at 1 serving/day

True Cost Per Effective Dose

$2.02/effective dose

$60.60/month for effective dosing

Value Score

Decent value

Save $59.10/month (98%)

by switching to The Ordinary Niacinamide 10% + Zinc 1%

Where It Falls Short

Extremely expensive at $182/bottle ($2.02/day). The L-ascorbic acid formulation oxidizes quickly -- must be stored properly and used within 3 months of opening (it turns orange when oxidized). Cheaper vitamin C serums exist but lack the specific Duke Patent formulation evidence. The bottle design exposes product to air, accelerating degradation.

Best For

Those willing to pay for the most evidence-backed vitamin C formulation
Dermatologist patients receiving professional skincare guidance
People wanting documented photoprotection alongside sunscreen
Anti-aging focused consumers prioritizing collagen stimulation evidence

Not Ideal For

Budget-conscious buyers (many alternatives exist at 1/10th the price)
Those who cannot store properly or use within 3 months of opening
People who are satisfied with cheaper vitamin C derivatives (they may work, less evidence)
Sensitive skin (L-ascorbic acid at pH 2.5-3.5 can sting)