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Researchers in Türkiye have loaded a blackcurrant extract (Ribes nigrum) into polymer nanoparticles and shown, in the lab, that it can kill Candida albicans – the yeast behind most cases of vulvovaginal candidiasis (thrush).
Published in June 2026 in the Journal of Applied Polymer Science, the study is early, laboratory-stage work: it characterises the extract, builds and compares three nanoparticle systems, and tests them against candida in a dish.1 It is not a treatment you can buy, and it has not been tested in animals or people.
Still, it is an interesting bit of research for anyone following the search for new antifungals, because two of My Vagina’s long-running interests collide in it: plant polyphenols with genuine antifungal activity, and chitosan as a mucoadhesive delivery material for the vagina.
What did the study actually test?
The team extracted compounds from blackcurrant fruit harvested from different regions of Mount Uludağ in Türkiye, and dried using several different methods, then analysed what was in each extract. Blackcurrants are rich in polyphenols, particularly anthocyanins, which are the pigments behind their deep purple-black colour and a plausible source of antifungal activity.1
They then loaded the extract into three nanoparticle systems and compared them: PLGA (poly(lactic-co-glycolic acid), a well-established biodegradable polymer), chitosan on its own, and chitosan-coated PLGA. Each was characterised for particle size, surface charge, how the extract was released over time, whether it was toxic to cells, and whether it could kill candida in vitro.1
Both the raw extract and the loaded nanoparticles were non-cytotoxic in the cell tests, and both showed strong antifungal activity against C. albicans in the dish.1 So the plant extract worked, and packaging it into nanoparticles did not poison the cells they tested.
Why chitosan-coated PLGA came out on top
Of the three, the chitosan-coated PLGA nanoparticles were the standout for vaginal use. They had a high positive surface charge, an optimal particle size, and mucoadhesive properties, meaning they stick to the mucus lining rather than washing straight back out. They also released the extract in a slow, controlled way over roughly two weeks.1
That combination matters for the vagina specifically. A treatment that clings to the vaginal wall and drip-feeds its active compound for days, rather than being expelled within hours, is exactly the kind of thing that could, in principle, cut the number of doses and improve results.
Chitosan is a recurring character here: we have written before about chitosan polymers tested for their biofilm-busting capacity, and it keeps turning up in vaginal delivery research for good reason.
Why is anyone bothering? Antifungal resistance
The motivation the authors give is the same one clinicians keep running into. The azole drugs used for thrush, fluconazole chief among them, are losing ground as candida grows more resistant to them.1,2
A 2025 systematic review and meta-analysis of two decades of data from Türkiye – the same country as this study – tracked a rising course of antifungal resistance in C. albicans, and a 2026 review laid out how that resistance builds through target-gene mutations and drug-efflux pumps.2,3
In our specialist clinic, treatment-resistant thrush is one of the more disheartening things we see – women who have cycled through repeated courses of the same antifungal with less and less to show for it. That real-world problem is exactly why a natural antifungal, delivered in a way that stays put, is worth watching.
If this interests you, our explainer on treatment-resistant thrush covers why the usual drugs stop working and what else is on the table.
How this affects the vagina
Vulvovaginal candidiasis is a fungal overgrowth in the vagina and vulva, most often caused by C. albicans, and it produces the familiar itch, irritation and thick discharge. The whole point of a vaginal delivery system like this one is local action: get an effective antifungal onto the vaginal mucosa, keep it there, and release it steadily, without pushing a drug through the whole body and its side effects.1
That is the promise. The important caveat is that everything here happened in test tubes and cell cultures. Killing candida in a dish is not the same as clearing an infection in a living vagina, where mucus, pH, the resident protective bacteria and the immune system all get a say.
Plenty of compounds look brilliant in vitro and then disappoint in the body, so this is an early result that needs a lot more work before it means anything for real patients.
The naturopathic thread: polyphenols and yeast
What we like about this study is that it takes a food-derived, polyphenol-rich extract seriously as a candidate antifungal, and puts real formulation science behind it. Plant polyphenols are an area we have long thought is underrated for yeast – our piece on foods high in polyphenols walks through the dietary side of the same idea.
Nanoparticle delivery is also not a fringe idea for the vagina. Other researchers have chased similar goals with metals and polymers – see our coverage of silver nanoparticles for vaginal infections – and the broader field of nanotech drug delivery for microbial control is well established. What is newer here is pairing that delivery science with a specific, edible plant extract aimed squarely at resistant thrush.
Frequently asked questions
Can I use blackcurrant extract to treat thrush right now?
No. This is laboratory research on a formulated nanoparticle system, not a product on a shelf, and eating blackcurrants or dabbing on a shop-bought extract is not the same thing as the tested formulation. If you have thrush, see a practitioner rather than experimenting.
Was this tested in people?
No. The work was done in vitro – on cell cultures and candida in the lab. It has not been tested in animals or in a clinical trial, so we do not yet know if it is safe or effective in a real vagina.
What is PLGA and chitosan doing in the mix?
PLGA is a biodegradable polymer that forms the nanoparticle core and controls slow release. Chitosan is a natural, positively charged polymer that makes the particles stick to vaginal mucus, so the treatment stays where it is needed for longer.1
Why does antifungal resistance matter for thrush?
As C. albicans becomes more resistant to azole drugs like fluconazole, the standard tablets and creams work less well, and recurrent or stubborn thrush becomes harder to shift. That is what is driving the hunt for new options, including natural ones.2,3
What to do next
If you are dealing with thrush that keeps coming back or is not responding to the usual treatments, the most useful first step is knowing exactly what is going on in there. A comprehensive vaginal microbiome test can identify which candida species you have and what else is present, which shapes what actually works.
If you would like tailored help, you can book an appointment with our clinic. And for the bigger picture on why some infections stop responding, our guide to treatment-resistant thrush is a good place to start.
This is general information, not a substitute for personalised medical advice.
- Aslan Aras A, Uygunoz D, Karaduman E, et al. Development and Characterization of Ribes nigrum Extract-Loaded PLGA/Chitosan Nanoparticles as a Vaginal Drug Delivery System for Vulvovaginal Candidiasis. J Appl Polym Sci. 2026. doi:10.1002/app.71079.
- Kilbas I, Kahraman Kilbas EP, Horhat FG, Ciftci IH. Twenty-Year Course of Antifungal Resistance in Candida albicans in Türkiye: A Systematic Review and Meta-Analysis. J Fungi. 2025;11(8):603. doi:10.3390/jof11080603.
- Zhu W, Guo L. Advances in vulvovaginal candidiasis research: a comprehensive review from epidemiology, diagnosis, treatment to resistance mechanisms. Front Microbiol. 2026;17. doi:10.3389/fmicb.2026.1811011.
