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Oral Supplements for Warts: Does Zinc Work, and What Works Better?

For common warts, the best-tested home treatment is not a supplement: salicylic acid on the skin helps a little (grade A), and about half of children's warts go away within a year on their own. Among pills, oral zinc sulphate cleared more warts than control treatments in a 2025 review of 7 trials, more so in people low in zinc (grade B), but the doses were far above the adult upper limit and often caused nausea.

Published How we grade evidenceEditorial policy

Warts are small skin growths caused by the human papillomavirus (HPV). Most go away on their own, the best home treatment goes on the skin, and the one supplement with real trial support, zinc, was tested at doses far above the safe daily limit. Here is what the trials show for zinc, propolis, echinacea, cimetidine and vitamin D, and what the treatments that are not supplements can do.

The short version

  • Salicylic acid on the skin clears more warts than placebo, a modest gain. It is a skin treatment, not a supplement. Grade A (Kwok 2012).
  • About half of children's warts go away within a year with no treatment (Bruggink 2013).
  • Oral zinc sulphate cleared more warts than control treatments, more so in people with low zinc, but at doses far above the upper limit, and it added nothing to freezing in one trial. Grade B (Wang 2025; Mahmoudi 2018).
  • Propolis by mouth helped in one single-blind trial; echinacea did not. Grade C (Zedan 2009).
  • Cimetidine, a stomach-acid medicine, did no better than placebo in double-blind trials. Grade B for no benefit (Yilmaz 1996; Rogers 1999).

What works best for warts?

Grade A for salicylic acid, and it is not a supplement. Treatments you put on the skin and treatments you swallow are tested separately, so this guide keeps them apart. A Cochrane review of 85 trials (8,815 people) found that salicylic acid paint or plaster made clearance about half again as likely as placebo, more so on hands than feet. Freezing (cryotherapy) at a clinic was not clearly better than placebo overall, or than salicylic acid; the two together beat salicylic acid alone in 2 trials (328 people). Clear duct tape showed no advantage over placebo in 2 trials (193 people) (Kwok 2012).

Waiting is a fair choice for warts that don't bother you. In a Dutch study of 1,099 schoolchildren aged 4 to 12, half of those with warts were free of them within a year, faster in younger children (Bruggink 2013).

Does zinc help warts?

Grade B. Taken by mouth, zinc sulphate cleared more warts than the comparison groups, more so in people whose zinc was low to start with. A 2025 review of 7 randomized trials found a higher rate of complete clearance with oral zinc sulphate, a much bigger effect in people with low blood zinc, and, when it was given alongside usual wart treatment, fewer warts returning within 6 months. Nausea and vomiting were the common side effects (Wang 2025).

Single trials point in different directions. One 2002 study enrolled 80 people with more than 15 stubborn warts, all with low zinc, 20 of the 23 who finished zinc sulphate cleared within 2 months, against none of the 20 who finished placebo; many dropped out (Al-Gurairi 2002). In a double-blind trial of 83 people also having freezing treatment, warts cleared in 68% with zinc and 64% with placebo, and recurrence did not differ (Mahmoudi 2018). An earlier systematic review found only limited evidence for zinc, perhaps in people who are short of it (Simonart 2012), and a 2025 review that pooled oral zinc trials against placebo found a benefit, but not when zinc was added to treatments such as freezing (Shafiei 2025).

The doses are the problem. Both trials used up to 600 mg of zinc sulphate a day, which supplies far more zinc than the adult upper limit. Upper limit for adults: 40 mg of zinc a day, because more can cause copper deficiency; take more only with blood tests or your clinician's advice (NIH ODS; check your stack). Copper deficiency from zinc pills has caused severe anemia (case report) (Magham 2023). Never give a child high-dose zinc unless a doctor prescribes it. See our zinc page and copper page.

Are warts caused by a vitamin deficiency?

Not as a rule, though low zinc turns up more often in people with stubborn warts. Grade C, from small observational studies. Among 75 people with persistent warts, 56% had low blood zinc, against 32% of 75 matched people without warts (Raza 2010). In another comparison of 40 people with warts and 40 without, vitamin D, ferritin, folate and zinc were similar, while vitamin B12 was lower in the wart group (Tamer 2020). A third study found vitamin D only slightly and not significantly lower in people with warts (Shalaby 2022). If stubborn warts make you wonder, a blood test answers the question better than a guess.

Does propolis help warts?

Grade C. Propolis is a resin that bees make. In one 3-month single-blind trial, 135 people with different types of warts took propolis, echinacea or a placebo by mouth. Among those taking propolis, 75% with flat warts and 73% with common warts saw them clear, significantly more than with echinacea or placebo (Zedan 2009). No double-blind trial has repeated it. People who react to bee products should avoid it: 1.2% to 6.6% of people patch-tested for skin rashes are allergic to propolis (Walgrave 2005).

Does cimetidine help warts?

No. Grade B for no benefit. Cimetidine is a medicine that lowers stomach acid, not a supplement, and the wart trials used high, prescription-strength doses. In a double-blind trial of 70 people with many warts, 32% cleared on cimetidine and 31% on placebo after 3 months (Yilmaz 1996). A stricter trial in adults with stubborn warts also found it no better than placebo, after earlier placebo-controlled trials had failed too (Rogers 1999). A review of systemic wart treatments found no consistent evidence for it (Simonart 2012). Ask your prescriber or pharmacist before using any medicine for something it is not labelled for.

What about vitamin D or zinc injections for warts?

These are clinic procedures, not supplements: a dermatologist injects vitamin D3, a vaccine or zinc solution into the wart. In a 2026 review of 9 trials (742 people), injected vitamin D3 cleared warts less often than an injected measles, mumps and rubella vaccine (Balach 2026). Those results say nothing about vitamin D pills: we found no trial reporting results for vitamin D taken by mouth for warts, and a 2022 study that planned to give it to deficient patients reported no outcome in its abstract (Shalaby 2022).

What we'd skip

  • Cimetidine for warts. Double-blind trials found it no better than placebo (Yilmaz 1996; Rogers 1999).
  • Echinacea for skin warts. It did no better than placebo in the one trial that tested it by mouth (Zedan 2009).
  • Raw garlic or apple cider vinegar taped to the skin. No trial supports either for common warts, and both have caused chemical burns, garlic in children (case reports) (Schimmel 2019; Bunick 2012).
  • High-dose zinc for months without a blood test. The benefit was largest in people low in zinc, and the cost can be copper deficiency (Wang 2025; Magham 2023).
  • Supplements sold to clear HPV. An international HPV society statement in 2026 found that supplements and other promoted products lack robust evidence for clearing the virus (Arroyo Mühr 2026).

Safety and interactions

  • Zinc often causes nausea and vomiting at wart-trial doses (Wang 2025). Upper limit for adults: 40 mg of zinc a day, because more can cause copper deficiency (NIH ODS).
  • Zinc and medicines: zinc can lower the absorption of quinolone and tetracycline antibiotics and of penicillamine, so space them apart and ask your pharmacist (NIH ODS). No interaction studies were found for propolis.
  • Several supplements at once: zinc turns up in multivitamins, cold lozenges and immune blends, so check your stack against the upper limits.
  • Children: no amounts here. Pregnant or breastfeeding: ask a clinician before any treatment.

When to see a doctor

  • Any growth that bleeds, changes colour or shape, or grows quickly, or that you aren't sure is a wart.
  • Warts on the genitals or around the anus. They need a clinician's diagnosis and treatment, and supplements have no good evidence there (Arroyo Mühr 2026).
  • Warts on the feet if you have diabetes or poor circulation, before you use salicylic acid or try to remove them yourself.
  • Many warts that keep spreading, or warts with a weakened immune system (for example from medicines after a transplant).
  • Warts on the face, before you put acids on them.

FAQ

Does zinc help warts? Oral zinc sulphate cleared more warts than control treatments in a 2025 review of 7 trials, more so in people with low zinc (grade B), but the trials used doses far above the 40 mg adult upper limit and it added nothing to freezing in one trial.

Is there a vitamin deficiency that causes warts? Not as a rule. People with stubborn warts had low zinc more often in one study, and lower vitamin B12 in another, but vitamin D was not significantly different (grade C).

Does cimetidine work for warts? No. Cimetidine is a stomach-acid medicine, not a supplement, and it did no better than placebo in double-blind trials.

Do warts go away on their own? Often. In a study of 1,099 schoolchildren, about half of those with warts were free of them within a year.

Does apple cider vinegar remove warts? No trial supports it for common warts, and apple cider vinegar on the skin has caused a chemical burn (case report).

Sources

  1. Kwok CS, et al. Topical treatments for cutaneous warts. Cochrane Database Syst Rev. 2012. PubMed 22972052 · doi:10.1002/14651858.CD001781.pub3
  2. Bruggink SC, et al. Natural course of cutaneous warts among primary schoolchildren: a prospective cohort study. Ann Fam Med. 2013. PubMed 24019275 · doi:10.1370/afm.1508
  3. Wang CC, et al. Oral zinc sulphate reduces the recurrence rate and provides significant therapeutic effects for viral warts: A systematic review and meta-analysis of randomized controlled trials. PLoS One. 2025. PubMed 40334186 · doi:10.1371/journal.pone.0323051
  4. Mahmoudi H, et al. Cryotherapy plus oral zinc sulfate versus cryotherapy plus placebo to treat common warts: A double blind, randomized, placebo-controlled trial. Int J Womens Dermatol. 2018. PubMed 29872682 · doi:10.1016/j.ijwd.2017.09.004
  5. Zedan H, et al. Propolis as an alternative treatment for cutaneous warts. Int J Dermatol. 2009. PubMed 20064186 · doi:10.1111/j.1365-4632.2009.04184.x
  6. Yilmaz E, et al. Cimetidine therapy for warts: a placebo-controlled, double-blind study. J Am Acad Dermatol. 1996. PubMed 8647965 · doi:10.1016/s0190-9622(96)90279-0
  7. Rogers CJ, et al. Cimetidine therapy for recalcitrant warts in adults: is it any better than placebo?. J Am Acad Dermatol. 1999. PubMed 10411426 · doi:10.1016/s0190-9622(99)70421-4
  8. Al-Gurairi FT, et al. Oral zinc sulphate in the treatment of recalcitrant viral warts: randomized placebo-controlled clinical trial. Br J Dermatol. 2002. PubMed 11952542 · doi:10.1046/j.1365-2133.2002.04617.x
  9. Simonart T, et al. Systemic treatments for cutaneous warts: a systematic review. J Dermatolog Treat. 2012. PubMed 21054194 · doi:10.3109/09546634.2010.500324
  10. Shafiei M, et al. Clinical Use of Zinc in Treatment of Human Papillomavirus Cervical Infection and Viral Warts: A Systematic Review and Meta-Analysis. Rev Med Virol. 2025. PubMed 40670323 · doi:10.1002/rmv.70054
  11. Magham K, et al. Severe copper deficiency anemia caused by zinc supplement use. Am J Emerg Med. 2023. PubMed 37640593 · doi:10.1016/j.ajem.2023.08.033
  12. Raza N, et al. Zinc deficiency in patients with persistent viral warts. J Coll Physicians Surg Pak. 2010. PubMed 20378032
  13. Tamer F, et al. Pre-treatment vitamin B12, folate, ferritin, and vitamin D serum levels in patients with warts: a retrospective study. Croat Med J. 2020. PubMed 32118375 · doi:10.3325/cmj.2020.61.28
  14. Shalaby ME, et al. Diagnostic and therapeutic implications of vitamin D deficiency in patients with warts: A case-controlled study. J Cosmet Dermatol. 2022. PubMed 33860625 · doi:10.1111/jocd.14156
  15. Walgrave SE, et al. Allergic contact dermatitis from propolis. Dermatitis. 2005. PubMed 16536336
  16. Balach R, et al. Comparative Efficacy and Safety of Intralesional MMR Vaccine and Vitamin D3 in Managing Nongenital Warts: A Systematic Review and Meta-Analysis. J Cosmet Dermatol. 2026. PubMed 41502319 · doi:10.1111/jocd.70618
  17. Schimmel J, et al. Pediatric Cases Involving Chemical Burns to Garlic Used to Treat Warts. Dermatitis. 2019. PubMed 30570580 · doi:10.1097/DER.0000000000000431
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