Lichen planus & Nanocurcumin: What real human research shows

By Dr Conor Kerley, PhD, nutrition researcher, and someone who lives with an autoimmune condition himself.

Lichen planus is one of those conditions almost nobody has heard of until they have it. When it affects the mouth, which is where it causes most misery, it means white lacy patches, red raw areas or ulcers that burn every time you eat, drink or brush your teeth. It is an autoimmune condition: immune cells attack the lining of the mouth. The usual treatment is steroids, as a gel, a mouthwash or tablets, and they work, but nobody wants to be on steroids indefinitely for a condition that can grumble on for years.

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That is why curcumin keeps being tested in oral lichen planus. It has one of the longest human trial records of any condition curcumin has been tried in, going back to 2007, and it includes something rare in supplement research: head-to-head trials against the standard treatment.

Quick answer

• Curcumin has been tested in people with oral lichen planus in randomised trials since 2007, including against steroids directly.
• The dose decided everything. A 2007 trial at 2,000 mg a day was stopped early because it was doing nothing. A 2012 trial at 6,000 mg a day reduced pain, redness and ulceration where placebo did not.
• In a 2020 trial, one 80 mg capsule of nanocurcumin a day matched a 10 mg prednisolone tablet, the standard steroid, on pain, burning and lesion size.
• Pooled analyses are mixed but lean positive: a 2025 meta-analysis found curcumin relieved pain faster than steroids in the first week and matched them after that.
• Nothing here replaces your dentist's or doctor's treatment. In most trials curcumin was tested alongside or against it under supervision.

Why curcumin is studied in lichen planus at all

Oral lichen planus is driven by T cells, immune cells that have wrongly decided the lining of the mouth is a threat. Curcumin calms overactive T cells and the inflammation signals they use, which is the same reason it is studied in psoriasis and inflammatory bowel disease [10, 14]. The mouth has one extra advantage: like the gut, it is somewhere curcumin can act directly on the tissue, whether from a capsule or applied as a paste.

What the human trials found

2007: the right idea at the wrong dose

The first randomised, placebo-controlled trial gave people 2,000 mg of curcuminoids a day for seven weeks [1]. At the first planned check, the curcumin group was doing no better than placebo, the statisticians calculated there was less than a 2% chance that would change, and the trial was stopped early. The researchers' own conclusion was that any future trial should use a bigger dose for longer. Remember this trial when someone tells you curcumin was "proven not to work". It was a dosing lesson, and the same team acted on it.

2012: the same team, three times the dose

Five years later the same researchers ran the trial again at 6,000 mg a day, in three divided doses [3]. This time the placebo group did not improve on any measure, while the curcumin group improved on all of them: pain scores, redness, ulceration and the overall disease score. Adverse effects were no more common than with placebo. A small trial, twenty patients, but a clean result, and it is the study that made high-dose curcuminoids a serious option in this condition.

Applied to the mouth directly

Several trials tested curcumin as a paste or gel on the lesions themselves. A 2016 randomised trial compared topical curcumin against triamcinolone, a standard steroid paste [6], and a 2017 study of a 1% curcuminoid gel reported reduced burning and lesion severity [9]. An earlier pilot had already pointed the same way [5]. For people who want to avoid swallowing anything at all, this line of research is worth knowing about.

2020: nanocurcumin against the steroid tablet

The trial most relevant to this site's readers: eighty milligrams of nanocurcumin, one capsule a day, against 10 mg of oral prednisolone for a month [12]. Pain, burning and lesion size fell in both groups, with no significant difference between them. Read that again with the doses in mind. One 80 mg nano capsule kept pace with the standard steroid tablet, and with the 6,000 mg the 2012 trial needed. That is the absorption story of this whole series in a single comparison. What the trial does not show is anything about side effects or long-term use; it was one month, and it found equivalence, not superiority.

What the pooled analyses say

Two systematic reviews in 2019 concluded curcumin was promising and safe in oral lichen planus [10, 11]. A 2024 meta-analysis was more cautious: pooling all trials, curcumin's overall effect on redness, lesion size and pain was not significant, though pain did improve significantly in the first two weeks of treatment [15]. A 2025 meta-analysis put curcumin directly against corticosteroids across the trials: curcumin relieved pain better in the first week, and matched the steroids from then on [16]. An honest summary: curcumin is not a miracle here, the trials are small and mixed, and the fairest reading is that it performs somewhere near the standard treatment, with the dose and the form deciding whether it performs at all.

The score so far

Why the form matters

The 2007 and 2012 trials are the same team, the same condition and the same compound. The only meaningful difference was dose, and it separated failure from success, because so little plain curcumin is absorbed. The 2020 trial closed the loop: shrink the particles so the curcumin actually gets in, and 80 mg a day did what previously took 6,000 mg. Plain turmeric powder, at roughly 3% curcumin, is not in this conversation at all.

Is it safe alongside treatment?

In these trials curcumin was tested alongside or directly against prescribed treatment, under medical supervision, and side effects were consistently no worse than placebo. Lichen planus needs a diagnosis, and oral lesions need monitoring by a dentist or doctor, partly because a small proportion can change character over time. So this is not a swap-your-steroids-for-turmeric story. It is a talk-to-whoever-treats-you story, and the reference list below is there to bring to that conversation.

Frequently asked questions

What dose did the trials use?
Plain curcuminoids only worked at 6,000 mg a day. Nanocurcumin worked at 80 mg a day, because far more of it is absorbed.

Can I just use turmeric?
No trial has used culinary turmeric. A teaspoon holds under 100 mg of poorly absorbed curcumin.

Does it work on skin lichen planus too?
The trials above are almost all in oral lichen planus. For skin involvement the evidence is thinner, and the psoriasis article covers what curcumin does in inflamed skin generally.

How fast would it work?
The 2025 meta-analysis found pain relief within the first week, and the 2020 trial ran for one month. If nothing has changed after a month or two, it is unlikely to.

Is lichen planus autoimmune?
Yes, it is T-cell driven. Our autoimmune disease article covers curcumin across ten autoimmune conditions, including this one.

Where nanocurcumin fits in

The 2020 trial used 80 mg of nanocurcumin a day. Phytaphix's Gold Standard Curcumin provides 80 mg of nanocurcumin per capsule. If you are thinking about it, bring this article and its references to your next dental or medical appointment.

Related reading: Curcumin and autoimmune disease · Psoriasis & Nanocurcumin · Curcumin supplements, the overview

References

1. Chainani-Wu N, Silverman S Jr, Reingold A, Bostrom A, McCulloch C, Lozada-Nur F, Weintraub J. A randomized, placebo-controlled, double-blind clinical trial of curcuminoids in oral lichen planus. Phytomedicine. 2007;14(7-8):437-446. PMID 17604143.
2. Rai B, Kaur J, Jacobs R, Singh J. Possible action mechanism for curcumin in pre-cancerous lesions based on serum and salivary markers of oxidative stress. J Oral Sci. 2010;52(2):251-256. PMID 20587949.
3. Chainani-Wu N, Madden E, Lozada-Nur F, Silverman S Jr. High-dose curcuminoids are efficacious in the reduction in symptoms and signs of oral lichen planus. J Am Acad Dermatol. 2012;66(5):752-760. PMID 21907450.
4. Chainani-Wu N, Collins K, Silverman S Jr. Use of curcuminoids in a cohort of patients with oral lichen planus, an autoimmune disease. Phytomedicine. 2012;19(5):418-423. PMID 22305276.
5. Singh V, Pal M, Gupta S, Tiwari SK, Malkunje L, Das S. Turmeric, a new treatment option for lichen planus: a pilot study. Natl J Maxillofac Surg. 2013;4(2):198-201. PMID 24665176.
6. Comparative efficacy of topical curcumin and triamcinolone for oral lichen planus: a randomized, controlled clinical trial. 2016. PMID 27507989.
7. Amirchaghmaghi M, Pakfetrat A, Delavarian Z, Ghalavani H, Ghazi A. Evaluation of the efficacy of curcumin in the treatment of oral lichen planus: a randomized controlled trial. J Clin Diagn Res. 2016;10(5):ZC134-137. PMID 27437348.
8. Comparison of the effects of curcumin mucoadhesive paste and local corticosteroid on the treatment of erosive oral lichen planus lesions. 2018. PMID 29510851.
9. Thomas AE, Varma B, Kurup S, Jose R, Chandy ML, Kumar SP, Aravind MS, Ramadas AA. Evaluation of efficacy of 1% curcuminoids as local application in management of oral lichen planus, an interventional study. J Clin Diagn Res. 2017;11(4):ZC89-93. PMID 28571271.
10. White CM, Chamberlin K, Eisenberg E. Curcumin, a turmeric extract, for oral lichen planus: a systematic review. Oral Dis. 2019;25(3):720-725. PMID 30614166.
11. Lv KJ, Chen TC, Wang GH, Yao YN, Yao H. Clinical safety and efficacy of curcumin use for oral lichen planus: a systematic review. J Dermatolog Treat. 2019;30(6):605-611. PMID 30388912.
12. Kia SJ, Basirat M, Mortezaie T, Moosavi MS. Comparison of oral nano-curcumin with oral prednisolone on oral lichen planus: a randomized double-blinded clinical trial. BMC Complement Med Ther. 2020;20(1):328. PMID 33129289.
13. Curcuma longa in the treatment of symptomatic oral lichen planus: a non-randomized controlled trial. 2022. PMID 36578734.
14. Khosrojerdi M, Gumpricht E, Jamialahmadi T, Kesharwani P, Sahebkar A. Is curcumin a safe and effective therapeutic in the treatment against oral lichen planus? Curr Med Chem. 2023;30(15):1684-1688. PMID 36476439.
15. Moayeri H, Rajabi A, Mohammadi M, Moghaddam SB. Effects of curcumin on the treatment of oral lichen planus symptoms: a systematic review and meta-analysis study. BMC Oral Health. 2024;24(1):104. PMID 38233780.
16. Al-Maweri SA, Al-Qadhi G, Alqutaibi AY, Sallam NM, Assad M, Abdulghani MA, Mohammed MMA. Curcumin versus corticosteroids for symptomatic oral lichen planus: a systematic review and meta-analysis. Clin Exp Dent Res. 2025;11(5):e70227. PMID 40977174.

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