Vitamin C in Skincare
Vitamin C — L-ascorbic acid — is one of the most extensively studied actives in skincare. It is present in high concentrations in normal healthy skin, where it plays critical roles in collagen synthesis, antioxidant protection, and pigmentation control.
The clinical evidence is well-established. The formulation problem is equally well-established: ascorbic acid is inherently unstable in water, and a formulation that has oxidised cannot deliver the benefits associated with fresh, active vitamin C.
This page explores the clinical evidence for topical ascorbic acid, the stability challenges affecting conventional formulations, and how the EVIK™ LyoPearl freeze-dried bead format is designed to address those challenges.
View Product Specifications →What the Clinical Evidence Shows
Published systematic reviews and clinical studies identify several important mechanisms relevant to topical ascorbic acid in skincare.
Collagen Synthesis & Structural Support
Ascorbic acid acts as a required cofactor for prolyl and lysyl hydroxylase, enzymes involved in the hydroxylation of proline and lysine residues during collagen biosynthesis.
Adequate ascorbic acid supports the formation, stabilisation and structural integrity of collagen fibrils.
Clinical research has investigated topical ascorbic acid for its effects on collagen synthesis, dermal elastic fibre activity and collagen degradation, supporting research into skin firmness, elasticity and the appearance of fine lines and wrinkles.
Correia et al., Journal of Cosmetic Dermatology, 2023; Pullar et al., Nutrients, 2017.
Antioxidant Protection & Photoprotection
Ascorbic acid functions as an important antioxidant in human skin, helping neutralise reactive oxygen species generated by UV radiation, pollution and other environmental stressors.
It also participates in the skin's antioxidant network and can contribute to regeneration of vitamin E following oxidative stress.
Controlled studies have investigated topical ascorbic acid for reducing UV-induced photodamage, erythema and other oxidative effects associated with environmental exposure.
Pinnell et al., Dermatologic Surgery, 2001; Lin et al., Journal of the American Academy of Dermatology, 2003; Sasidharan et al., 2023.
Skin Brightening & Antipigmentary Effect
Ascorbic acid can interfere with melanin biosynthesis through effects on tyrosinase activity, an important enzyme in the melanin synthesis pathway.
Clinical research in areas including melasma and photodamage has investigated topical ascorbic acid for reducing pigmentation and improving the appearance of uneven skin tone.
A 2023 systematic review covering three randomised controlled trials reported improvements in skin appearance, including smoothness and evenness, compared with placebo.
Correia et al., Journal of Cosmetic Dermatology, 2023.
Formulation Stability Determines Delivery
The clinical potential of L-ascorbic acid is closely linked to formulation stability. Ascorbic acid is susceptible to oxidation when exposed to water, oxygen, light and unsuitable pH conditions.
Oxidation converts ascorbic acid into dehydroascorbic acid and subsequently into further degradation products.
Consequently, labelled concentration alone does not fully describe the active vitamin C available at the time of application.
JCAD Clinical Applications of Vitamin C in Dermatology, 2024.
The Stability Problem in Conventional Vitamin C Skincare
One of the central formulation challenges with L-ascorbic acid is maintaining the active molecule in a stable form throughout manufacturing, storage and consumer use.
Water is a key part of the problem
In conventional liquid serum formulations, L-ascorbic acid is dissolved in water from the time of manufacture. Exposure to oxygen, light and unsuitable pH conditions can progressively accelerate oxidation.
Once a product is opened, repeated exposure to air and environmental conditions can further contribute to degradation over the product's use period.
The result is a formulation challenge: maintaining the desired concentration and chemical form of ascorbic acid until the moment the consumer applies the product.
Dissolved in Water
Conventional liquid formulas expose L-ascorbic acid to an aqueous environment from manufacture onward.
Oxygen Exposure
Oxygen exposure can contribute to oxidation of ascorbic acid over time.
Light & pH
Light exposure and pH conditions can further influence vitamin C stability.
Active Loss
Progressive oxidation can reduce the amount of active ascorbic acid available at application.
Conventional Stability Strategies
Formulators use several approaches to slow vitamin C degradation, including:
- pH adjustment, commonly targeting an acidic formulation
- Ferulic acid and tocopherol as antioxidant co-actives
- Opaque packaging to reduce light exposure
- Airless packaging to reduce oxygen exposure
The Remaining Challenge
These strategies can help improve formulation stability, but they do not change the fundamental chemical sensitivity of dissolved L-ascorbic acid.
For brands pursuing preservative-free, clean-label or waterless positioning, the additional stabilisation requirements can also increase formulation complexity.
Why the Freeze-Dried Bead Format Changes the Picture
The core concept behind EVIK™ LyoPearl Ascorbic Acid is simple: remove water from the formulation until the moment of use. Lyophilization — freeze-drying — removes water under controlled conditions without exposing the formulation to the prolonged aqueous environment present in conventional liquid serums.
The resulting dry bead is designed to protect the L-ascorbic acid formulation during storage and distribution, with the active exposed to water only at the point of application.
No Preservatives
The dry bead contains no free water to support microbial growth, reducing the need for a conventional preservative system within the bead formulation.
Reduced Oxidation Exposure
In the dry state, L-ascorbic acid is not continuously exposed to the aqueous conditions associated with conventional liquid formulations.
Ambient Temperature Storage
The dry format is designed to support ambient-temperature storage, helping simplify distribution without refrigerated handling.
Fresh Dose at Application
Each single-use bead is dissolved immediately before use, allowing the formulation to be prepared at the point of application.
Clean-Label Potential
The dry format can reduce the need for multiple stability-support ingredients commonly used in aqueous vitamin C formulations.
Single-Dose Format
One bead provides a defined quantity of the formulation, supporting consistent single-use preparation.
Skincare Use Cases & Formulation Applications
EVIK™ LyoPearl Ascorbic Acid supports product-development concepts where fresh preparation, single-dose delivery and dry-state formulation are important considerations.
Premium Single-Use Vitamin C Serum
Each bead can be dissolved at point of use to prepare a fresh L-ascorbic acid treatment without the repeated opening of a multi-use liquid serum.
Two-Component Vitamin C System
Pair the dry bead with a liquid activator such as water, hyaluronic acid serum or botanical water in dual-component packaging.
Preservative-Free Vitamin C
A dry delivery format for brands developing preservative-free, clean-label, waterless or free-from skincare concepts.
Anti-Aging & Brightening
A targeted single-dose format containing L-ascorbic acid together with sodium hyaluronate and hydrolyzed collagen co-actives.
Travel & Sampling
Compact dry beads can simplify sample-size and travel-oriented product concepts without the liquid format of conventional serums.
Stability Benchmarking
Research teams can use the format for comparative evaluation of lyophilized and aqueous ascorbic acid formulations over time.
EVIK™ LyoPearl Ascorbic Acid
EVIK™ LyoPearl Ascorbic Acid is available for research and evaluation. Each bead contains 4.2 mg of the formula described above, with L-ascorbic acid representing 82.7% of dry weight alongside sodium hyaluronate and hydrolyzed collagen co-actives.
The formulation also contains sodium hyaluronate and hydrolyzed collagen as co-actives. Supplied as 10 LyoPearls per vial.