Science
Mechanism of Action
As a cofactor for the enzyme gamma-carboxylase, Phytonadione facilitates the activation of precursor proteins essential for blood clotting. In skincare, this mechanism is believed to strengthen capillary walls, while its anti-inflammatory action, achieved through suppressing NF-κB activation and reducing pro-inflammatory cytokines, supports overall skin health, even skin tone, and the reduction of certain discolorations and visible signs of aging.
Research
Clinical Evidence
Medium confidence0.3%
Key findings
- 01 A topical VK1 product demonstrated minimal skin permeability in an ex vivo porcine model but maintained 98.1% stability after four months at ambient temperatures.
- 02 This range is considered effective for most topical applications, with higher concentrations not yielding proportionally greater efficacy but increasing cost.
- 03 Used effectively in general anti-redness formulations, often in conjunction with other vasoconstrictive ingredients.
- 04 Higher concentrations are applied in post-procedure care products, typically alongside supporting active ingredients.
Transparency
Dusting Analysis
While a general range of 0.1-1.0% is reported in skincare, the effective range for noticeable benefits begins around 0.3%. Formulations below this threshold, such as at 0.1%, may serve more as label claims rather than delivering significant topical effects, especially given documented minimal skin permeability at lower concentrations. Conversely, higher concentrations (1-2%) are associated with increased incidence of allergic contact dermatitis, making effective yet safe formulation challenging.
The Formula
Formulation
Stability
Pure Phytonadione is highly susceptible to rapid degradation when exposed to light and air. It is stable to heat but decomposes in alkaline environments. Optimal stability is achieved within a pH range of 5.5 to 7.0. For preservation, it must be stored in a tightly sealed, dry, well-ventilated container at 2-8 °C, protected from air, moisture, and light, ideally under an inert gas.
Conflicts
- alkalis
- light
- air
Safety
Safety Profile
The Scientific Committee on Consumer Safety (SCCS) of the EU has deemed Phytonadione unsafe for cosmetic use due to concerns over cutaneous allergy and sensitization, leading to its ban in Europe. Documented cases of allergic contact dermatitis are cited. California Assembly Bill No. 496 (AB496) is slated to ban Phytonadione in cosmetics starting January 1, 2027, reflecting growing safety concerns. While the FDA approved phylloquinone for medical use pre-1955, this does not apply to its cosmetic use or safety assessment.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite its purported benefits for skin discoloration and redness, Phytonadione poses a high sensitization risk and is banned in Europe with an impending ban in California, rendering it unsuitable for precise, consumer-safe skincare formulations.
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References
Sources