20% CEF Serum

CEF 20% Vitamin C Serum —
active overload solved.

A stable vitamin C + vitamin E + ferulic acid serum — calibrated for photoprotection support and lasting radiance.

Most vitamin C serums are either too unstable to be effective, too aggressive to layer, or too basic to differentiate. CEF 20% was designed to solve all three.

Shop Now $40 one-time  ·  $34/mo Subscribe & Save

The Problem

Active overload is real — and most vitamin C serums make it worse.

Too much sting.

Too much instability at high concentrations.

Too much conflict with retinol, AHAs, and BHPs.

Too much "stronger is better" thinking applied to a sensitive active.

Too many serums that stop working the moment you open the bottle.


CEF 20% was designed for people who want the proven benefits of vitamin C — brightness, environmental protection support, tone improvement — without the harsh active-serum experience.

The Promise

A vitamin C serum that works with your skin, not against it.

CEF 20% delivers 20% L-Ascorbic Acid in a stable, buffered system with Vitamin E and Ferulic Acid — the proven CEF combination that photoprotection research has shown to be complementary.

CEF is your morning anchor. Apply it. Forget it. Get on with your routine.

Texture

Silky, low-tack, absorbs clean — layers under moisturizer without a sticky afterfeel.

Why CEF

What makes this different from market alternatives.

Form

Triple-antioxidant complexity vs. single active

Most vitamin C serums are just L-Ascorbic Acid in solution. CEF 20% combines three complementary antioxidants — L-Ascorbic Acid, Tocopherol, and Ferulic Acid — calibrated to work together rather than compete.

Stability

Formulated stability vs. "raw" ascorbic acid

Pure L-Ascorbic Acid is notoriously unstable above 10%. The addition of Tocopherol and Ferulic Acid stabilizes the formula — so the serum you apply in month three is still working, not oxidized.

Layering

Designed to layer vs. conflicting with your routine

CEF 20% is buffered for tolerance, not acidity. It is formulated to sit cleanly under moisturizer and sunscreen — not conflict with retinol, niacinamide, or other actives in your routine.

Research

CEF research basis vs. trend-driven single actives

The vitamin C + E + ferulic acid combination has a research basis dating to studies on photoprotection. CEF 20% is built on that science — not a trending single-ingredient concentration war.

Ingredient Transparency

The CEF formula — every active, every percentage.

01 / Primary Active

L-Ascorbic Acid

20%

The gold-standard form of vitamin C. Brightening, collagen-supportive, and environmental protection-complementary at proven concentrations.

02 / Antioxidant Support

Tocopherol

1%

Vitamin E in its most bioactive form. Stabilizes the ascorbic acid, adds antioxidant protection, and supports the skin barrier.

03 / Synergy Agent

Ferulic Acid

0.5%

A plant-based antioxidant that stabilizes both vitamin C and vitamin E, and has research suggesting it extends their photoprotection benefits.

04 / Barrier Repair

Panthenol

Pro-Vitamin B5

Humectant and barrier-supporting ingredient that helps the skin retain moisture and maintain tolerance during active use.

Honest Fit Check

CEF 20% is probably not for you if:

This is for people who want a stable, well-formulated vitamin C serum and are willing to build a routine around it.

Pricing

Straightforward pricing. No founding member confusion.

CEF 20% is available at full retail pricing — one-time purchase or Subscribe & Save on a 30-day cadence and save 15%.

One-Time Purchase

$40 one-time

Buy once, no commitment. Ships in 3 days. Free returns if it's not right for your skin.

Subscribe & Save — 30 Day

$34 /mo — save 15%

Delivered every 30 days. Cancel or pause anytime. Your serum ships automatically so you never run out.

Questions? hello@fulgira.com

Shop CEF 20% — $40