Timeless 20% Vitamin C + E Ferulic Acid Serum
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Formulation Summary
A straightforward CE Ferulic serum with 20% L-ascorbic acid, 1% vitamin E, and 1% ferulic acid. This follows the research-proven antioxidant combination first commercialized by SkinCeuticals. The formula contains only 11 ingredients, keeping it focused and functional. Widely recognized as one of the closest SkinCeuticals CE Ferulic dupes at a fraction of the price.
Timeless directly replicates the CE Ferulic approach: L-ascorbic acid at a high concentration, vitamin E for synergistic antioxidant benefit, and ferulic acid to stabilize the combination and double its photoprotection. At 20%, the vitamin C is higher than SkinCeuticals' 15%, which may provide slightly more potency but also increases irritation risk. The formula discloses all three key concentrations (20%, 1%, 1%), which is unusual transparency for this category. Ethoxydiglycol is the primary solvent and penetration enhancer, the same ingredient used by SkinCeuticals.
Quick Facts
Designed For
- •Those seeking the CE Ferulic combination at an affordable price
- •Users comfortable with high-concentration L-ascorbic acid
- •People looking for a research-backed antioxidant serum
- •Budget-conscious shoppers who want SkinCeuticals-level actives
- •Users who prefer fragrance-free, minimalist formulas
May Not Suit
- •Users with sensitive skin who cannot tolerate 20% L-ascorbic acid
- •Those who prefer stable vitamin C derivatives that do not oxidize
- •People who want additional actives like peptides or niacinamide in their vitamin C serum
- •Users in warm climates who cannot store the serum properly (it degrades faster in heat)
Key Ingredients
| Ingredient | Concentration | Function |
|---|---|---|
| L-Ascorbic Acid | 20%brand-confirmed | Pure vitamin C at a high concentration. Research supports efficacy in the 10-20% range. At 20%, this is at the top of the proven range. Provides antioxidant protection, brightening, and collagen stimulation. Requires a low pH (below 3.5) for optimal penetration. |
| Alpha Tocopherol (Vitamin E) | 1%brand-confirmed | Fat-soluble antioxidant. When combined with vitamin C and ferulic acid, the trio provides synergistic photoprotection that exceeds each ingredient used alone. Vitamin E also helps regenerate oxidized vitamin C. |
| Ferulic Acid | 1%brand-confirmed | Plant-derived antioxidant from rice bran. Stabilizes L-ascorbic acid and doubles the photoprotection of the CE combination. This is the key ingredient that differentiates CE Ferulic-type serums from basic vitamin C serums. |
| Sodium Hyaluronate | — | Hyaluronic acid salt for hydration. Helps offset the drying effect of the high-concentration L-ascorbic acid. |
| Panthenol | — | Provitamin B5. Provides soothing and moisture-retaining properties. Helps counterbalance potential irritation from the 20% ascorbic acid. |
The Formulation Explained
CE Ferulic replication
This formula replicates the core of the SkinCeuticals CE Ferulic patent: L-ascorbic acid, vitamin E, and ferulic acid at a low pH. The 2005 research paper that established this combination showed ferulic acid doubles the photoprotection of the CE pair. Timeless uses the same primary solvent (ethoxydiglycol) as SkinCeuticals.
20% vs. 15% L-ascorbic acid
Timeless uses 20% L-ascorbic acid versus SkinCeuticals' 15%. Research suggests antioxidant benefit plateaus around 20%, so the higher concentration may offer marginal additional benefit. However, 20% also increases irritation risk compared to 15%. Users with sensitive skin may prefer starting with the brand's 10% version.
Oxidation and shelf life
Like all water-based L-ascorbic acid serums, this formula oxidizes over time. The serum starts clear to pale yellow and gradually darkens. Timeless ships fresh batches and recommends using within 3 months of opening. Refrigeration extends shelf life. The ferulic acid helps stabilize the formula but cannot prevent eventual oxidation.
11-ingredient simplicity
With only 11 ingredients, this is one of the most stripped-down CE Ferulic serums available. Every ingredient serves a functional purpose. No fragrance, no botanical extracts, no marketing ingredients. The formula trusts the CE Ferulic combination to do the work.
Ingredients to Know
Penetration enhancer and primary solvent. Listed second, indicating a high concentration. The same ingredient used by SkinCeuticals in CE Ferulic. Helps L-ascorbic acid penetrate the skin effectively.
Humectant and co-solvent. Generally well tolerated but may irritate very sensitive skin. Listed fourth.
Emulsifier that helps the oil-soluble vitamin E mix with the water-based formula. Used at a low concentration.
Preservative system. A common alternative to parabens. Present at the minimum effective concentration for product safety.
User Feedback Patterns
Full INCI List
11 ingredients · Click "Show full list" to view
About Timeless
Timeless discloses exact concentrations for all three key actives: 20% L-ascorbic acid, 1% alpha tocopherol, and 1% ferulic acid. Full INCI lists are provided. The brand is notably transparent about shelf life and recommends refrigeration. Products are made in the USA.
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Sources
- • https://www.timelessha.com/products/20-vitamin-c-e-ferulic-acid-serum-1-oz
- • https://incidecoder.com/products/timeless-20-vitamin-c-e-ferulic-acid-serum
- • https://www.amazon.com/Timeless-Skin-Care-20-Vitamin/dp/B0036BI56G
- • https://www.beautyindependent.com/founder-story-veronica-pedersen-timeless-skin-care/
- • https://skincarehero.com/best-vitamin-c-serum-reddit/
Last updated: 2026-03
Rating Scales
Comedogenicity (0-5)
Likelihood of clogging pores. 0 = won't clog, 1-2 = low, 3 = moderate, 4-5 = high.
Irritancy (0-5)
Potential for skin irritation. 0 = non-irritating, 1-2 = low, 3 = moderate, 4-5 = high.
Ratings based on published ingredient studies. Individual reactions may vary.