SkinCeuticals C E Ferulic® Vitamin C Serum

Product Overview

SkinCeuticals C E Ferulic® is the originator antioxidant serum that established the clinical standard for topical vitamin C therapy in dermatology. The product's efficacy rests on the synergistic interaction among its three active antioxidant components: 15% L-ascorbic acid provides direct free radical neutralisation and stimulates pro-collagen I and III synthesis in human fibroblasts; 1% alpha-tocopherol (vitamin E) regenerates oxidised vitamin C and provides independent lipid-soluble antioxidant activity; and 0.5% ferulic acid — a hydroxycinnamic acid derivative — further doubles the combined photoprotective efficacy of the vitamins C and E combination while also stabilising the formulation. The aqueous vehicle is buffered to pH 2.5–3.0, which is critical for maintaining L-ascorbic acid in its bioavailable, uncharged form to facilitate passive diffusion across the stratum corneum into the viable epidermis.

In Singapore, topical cosmeceutical serums containing L-ascorbic acid are regulated as cosmetics under the ASEAN Cosmetic Directive (ACD) harmonised framework, enforced by the Health Sciences Authority (HSA) under the Health Products Act (Cap. 122D). SkinCeuticals C E Ferulic® is an internationally distributed product manufactured under ISO 22716:2007 Cosmetics Good Manufacturing Practices (GMP), and retailed through authorised dermatology clinics, aesthetic medical practices, and cosmeceutical suppliers including EMIS in Singapore. The product is not classified as a pharmaceutical and does not require Therapeutic Products registration under the HSA Therapeutic Products regulatory pathway.

Product Specifications

Clinical Indications and Key Applications

• Environmental oxidative stress protection: Topical application before UV and pollution exposure neutralises free radicals in the epidermis and dermis, supplementing but not replacing SPF sunscreen protection. Research demonstrates that the C + E + ferulic acid combination provides 8-fold photoprotection compared to unprotected skin, and doubles the protection of C + E alone.
• Post-inflammatory hyperpigmentation and dyschromia: L-ascorbic acid inhibits tyrosinase-mediated melanin synthesis, supporting brightening of post-acne marks, melasma, and solar lentigines over a 12-week treatment course. Used as an adjunct to dermatologist-prescribed depigmentation regimens.
• Collagen stimulation and anti-aging: L-ascorbic acid is an essential co-factor for prolyl hydroxylase and lysyl hydroxylase enzymes required for collagen cross-linking. Clinical studies on topical L-ascorbic acid demonstrate increased collagen I and III mRNA expression and reduced fine line appearance over 12 weeks of consistent use.
• Pre- and post-procedure skin conditioning: Prescribed by dermatologists and aesthetic physicians in Singapore for pre-laser brightening protocols and post-procedure barrier support, in conjunction with post-procedure serums such as SkinCeuticals Phyto Corrective or HA Intensifier.
• Clinic retail and aesthetic practice dispensary: Supplied to Singapore dermatology clinics, aesthetic medical practices, and specialist skin clinics as a clinic-dispensed cosmeceutical supporting patient treatment adherence and in-clinic product revenue.

Frequently Asked Questions

Why must the pH be 2.5–3.0 for vitamin C to work?

L-ascorbic acid exists in its uncharged (reduced) form at pH below 3.5, which is the form required to passively diffuse through the lipid-rich stratum corneum into the viable epidermis. At higher pH, L-ascorbic acid ionises and loses its ability to penetrate skin. The pH 2.5–3.0 window also maximises L-ascorbic acid chemical stability, reducing its rapid oxidative degradation to inactive dehydroascorbic acid. Ferulic acid additionally acts as a stabilising agent within this pH range.

How does C E Ferulic differ from other vitamin C serums on the market?

Many vitamin C serums use derivatives such as ascorbyl glucoside, ascorbyl palmitate, or magnesium ascorbyl phosphate, which must undergo enzymatic conversion to L-ascorbic acid in the skin. SkinCeuticals C E Ferulic® uses the direct, pure L-ascorbic acid form at 15% — the highest clinically effective concentration before diminishing returns and irritation risk — combined with the ferulic acid potentiator. This formulation is backed by peer-reviewed research and Duke University patent protection (US 7,179,841).

Is this product suitable for post-laser or post-peel skin in Singapore's climate?

During the immediate post-procedure healing phase (first 3–5 days post-ablative laser), the barrier is compromised and acidic serums should be withheld to avoid irritation. From day 5–7 onward, once re-epithelialisation is confirmed, C E Ferulic® can be reintroduced as part of a physician-directed antioxidant maintenance protocol. Singapore's tropical climate increases cumulative UV exposure, making daily antioxidant serum use particularly relevant for photoprotection maintenance between clinic visits.

Is SkinCeuticals C E Ferulic® regulated by HSA in Singapore?

The product is classified as a cosmetic under the ASEAN Cosmetic Directive (ACD), which Singapore enforces under the Health Products Act. Cosmetics under the ACD are notified rather than registered, meaning the responsible person notifies HSA prior to market placement. L-ascorbic acid at cosmetic-grade concentrations is a permitted cosmetic ingredient under the ACD Annex framework. It does not require Therapeutic Products or Medical Device registration. EMIS supplies the product for clinic-dispensed cosmeceutical procurement.

How should the serum be stored to prevent oxidation?

L-ascorbic acid oxidises on exposure to air, light, and heat. Store C E Ferulic® at room temperature (18–25°C), away from direct sunlight, and ensure the dropper cap is tightly sealed after each use. An amber or opaque bottle — as used in SkinCeuticals packaging — reduces photodegradation. Discard 3 months after opening or if the solution turns orange or brown, indicating significant oxidation to dehydroascorbic acid, which has no antioxidant activity. Do not refrigerate.

Available from EMIS for Singapore clinic procurement and individual purchase. Orders placed before 12:00 SGT are dispatched the same business day. Suitable for dermatology clinic retail, aesthetic practice dispensaries, and specialist skincare programme supply.