Cashew Apple Extract in Liposomes Retains 85% Vitamin C, Doubles Skin Penetration
The cashew tree (Anacardium occidentale) is best known for its seeds. But perched above each nut is a swollen, bell-shaped fruit called the cashew apple, loaded with roughly five times the vitamin C of an orange. The catch: that vitamin C is notoriously unstable. It degrades quickly on contact with air and light, and what survives on the surface still faces the skin barrier.
A team from four Thai universities (Rangsit University, Walailak University, Prince of Songkla University, and Chulalongkorn University) approached the problem through liposomal encapsulation. Published in November 2025 in MDPI Cosmetics, their study showed that wrapping cashew apple extract in liposomes preserved ~85% of its vitamin C content and roughly doubled delivery into an artificial skin model compared to the free extract.
What Liposomes Actually Do
A liposome is a nanoscale capsule built from the same phospholipid bilayers that form cell membranes. Because the structure mirrors the skin cell membrane, liposomes fuse with it readily, delivering their contents inside. That membrane-like shell also shields oxidation-prone compounds, such as vitamin C, from degradation in the formula. Liposomal vitamin C technology already exists in commercial skincare, but this research specifies the cashew apple as the antioxidant source and validates its bioactivity at the cellular level.
Three Effects Measured in the Lab
The researchers compared free cashew apple extract against the liposome-encapsulated version across three areas.
Free radical scavenging: Cashew apple extract demonstrated significant antioxidant activity, driven by its vitamin C content alongside polyphenols and flavonoids. Free radicals are unstable molecules that trigger oxidative stress in skin cells and accelerate visible aging.
Fibroblast protection and collagen synthesis: When applied to human fibroblasts (the cells in the dermis responsible for producing collagen) under oxidative stress conditions, the extract protected the cells from death and promoted collagen synthesis. The researchers described this as cytoprotective activity.
Wound healing: Using an artificial skin model, the team observed accelerated wound closure with the liposomal extract. This points to potential in skin repair beyond anti-aging applications.
The Numbers Behind the Delivery Advantage
The core finding is quantitative. Vitamin C stability in the liposomal formulation was approximately 85%, meaning the encapsulation significantly slowed the degradation that typically makes vitamin C serums lose potency before they are used up.
Skin penetration, measured in the artificial skin model, was roughly twice as high with the liposomal version as with the free extract. The stratum corneum, the outermost layer of skin, blocks most water-soluble molecules including vitamin C. Liposomes bypass this barrier more effectively due to their lipid-compatible structure, delivering a greater payload to the living cell layers below.
Safety Profile
Both fibroblast cells and monocytes (white blood cells involved in immune response) showed no cytotoxicity from either the extract or the liposomal formulation. There was also no measurable immune stimulation. For an ingredient at the early research stage, that is a useful baseline.
The significant caveat: all results are in vitro. The study used animal-derived cells and artificial skin constructs, not human participants. Whether these findings translate to real skin, at what concentrations, and through what delivery format remains to be established in clinical trials.
What This Means for Your Current Routine
Cashew apple liposome products do not exist on shelves yet. But liposomal vitamin C as a delivery format is already commercially available, found in serums and ampoules listing ‘Liposomal Ascorbic Acid’ or phospholipid-encapsulated vitamin C on the ingredient deck. If you already use a vitamin C serum, the practical takeaway from this research is about packaging: regardless of the vitamin C form, airtight, opaque, or pump-dispensing containers slow degradation and keep the active ingredient effective longer.