Manuka Honey for Canker Sores — What the Evidence Actually Shows

TL;DR

Honey is one of the best-supported home remedies for canker sores. Several small randomized trials have compared it with a prescription steroid paste: in two, honey did better (El-Haddad et al., 2014 — PMID: 25019115; Ghalwash et al., 2025 — PMID: 39723829), and in two others it did about as well. That's more trial evidence than almost any other home remedy has.

Manuka honey is the honey medicine takes most seriously. It has stronger antibacterial activity than most honeys, medical-grade Manuka dressings are FDA-cleared for wound care, and a Cochrane review found high-quality evidence that honey heals burns faster than standard dressings (Jull et al., 2015 — Cochrane Database Syst Rev). The canker sore trials used other honeys, so Manuka hasn't been tested on canker sores specifically, but it's a natural choice if you want the honey with the strongest wound-healing track record. To use any honey, dab a small amount on the dried sore a few times a day.

The Evidence

Trials comparing honey with a steroid paste

Honey has been tested against the standard prescription treatment, a steroid paste, in several small randomized trials:

• Saudi Arabia, 2014: 94 people with 180 minor canker sores received honey, a steroid paste, or Orabase (a plain protective paste with no drug) for five days. Honey did significantly better than both on ulcer size, days of pain, and redness, with no side effects (El-Haddad et al., 2014 — PMID: 25019115).
• Egypt, 2025: 30 people received thyme honey or triamcinolone (a common steroid paste) three times a day for a week. The honey group had smaller ulcers, less pain, and better scores on a mouth-related quality-of-life questionnaire by the end of the week (Ghalwash et al., 2025 — PMID: 39723829).
• India, 2022: 60 people received honey or triamcinolone paste. There was no difference between them in ulcer size, pain, or burning, and only the steroid group had side effects (Mhapuskar et al., 2022 — J Indian Acad Oral Med Radiol).
• Iran, 2023: 46 people used a honey-and-lemon spray or a steroid ointment. Again, no difference between them (Shirzaiy et al., 2023 — Braz J Oral Sci).

A study in 50 children also found that adding honey, applied to the sore and taken by mouth, to a standard pain reliever shortened recovery from about 13 days to about 9 (Abdulrhman et al., 2022 — Ain Shams Med J).

What that adds up to

Across these trials, honey consistently did as well as or better than a prescription steroid paste, with no side effects reported. For a cheap, safe home remedy, that's an unusually good record. The trials are small, they used different honeys, and some were in a single center, so it's not ironclad, but the direction is consistent.

Where Manuka fits

The canker sore trials above used ordinary and thyme honeys, so Manuka hasn't been put through a canker sore trial of its own. Where Manuka stands out is wound care, which is the closest thing to a canker sore that honey has been studied for extensively: it's the honey behind FDA-cleared medical wound dressings, and honey dressings have high-quality evidence for healing burns faster (Jull et al., 2015 — Cochrane Database Syst Rev). (One area where Manuka hasn't shown a benefit is mouth sores caused by cancer radiation, a different condition from canker sores (Bardy et al., 2012 — Br J Oral Maxillofac Surg).) See What Manuka Honey Is Genuinely Good For below.

Evidence level: moderate for honey for canker sores, based on several small trials, with Manuka adding a strong wound-healing track record.

Why Honey Might Help

Several properties of honey are plausibly helpful on an open sore. None of them has been measured directly in canker sores, so treat this as the "why it makes sense" rather than the "how we know."

It keeps the wound moist. Wounds in the mouth heal best in a moist environment, and honey holds moisture at the surface. This is the same reason honey has a long history in wound care generally.

It forms a coating. Thick honey sits on the sore and partially shields it from food, saliva, and your tongue, at least for a while. Some of the benefit may simply be protection.

It's mildly acidic and antibacterial. Honey's acidity and high sugar content make it a poor place for bacteria to grow. Manuka honey also contains methylglyoxal (MGO), which gives it stronger antibacterial activity in lab tests than most honeys.

That last point is where the Manuka marketing comes from, and it needs a caveat. Canker sores aren't infections. They're caused by the immune system attacking the lining of the mouth. Bacteria on the surface of an open sore may make it a bit more irritated, but killing them isn't what heals the sore. So Manuka's extra antibacterial power may not translate into any extra benefit for canker sores. Nobody has tested it.

Manuka vs. Ordinary Honey

What we know: ordinary honeys, including thyme honey, did as well as or better than a steroid paste in several small trials.

What hasn't been tested: how Manuka compares with other honeys for canker sores specifically. What Manuka brings is a stronger antibacterial profile and a proven record in medical wound care.

So which should you use?

• Raw honey is a reasonable and cheap first try. Processed, heavily heated honey may lose some of its enzyme activity, so raw is the better pick if you're using regular honey.
• Certified Manuka costs more. You're paying for a tested, consistent product with higher antibacterial activity and a track record in medical wound care.
• A honey wound gel is thicker and stays on the sore longer than liquid honey. That's a practical advantage in the mouth, where saliva washes things away quickly.

Regular honey has trial support for canker sores and is the budget option. If you want the honey with the strongest wound-healing credentials, certified Manuka or a Manuka gel is the natural choice.

What Manuka Honey Is Genuinely Good For

Manuka's reputation is built on real strengths.

Wound care. Honey has a long history as a wound dressing, and the evidence there is solid. A Cochrane review of 26 studies with about 3,000 people found high-quality evidence that honey heals partial-thickness burns about 4 to 5 days faster than conventional dressings, and moderate-quality evidence that it helps infected surgical wounds heal (Jull et al., 2015 — Cochrane Database Syst Rev). Many of the honey dressings used in wound care are made from Manuka, and medical-grade Manuka dressings such as Medihoney have been cleared by the FDA as wound dressings since 2007–2008.

Antibacterial strength. Manuka contains high levels of methylglyoxal (MGO), which gives it stronger and more stable antibacterial activity in lab tests than most honeys. That's a big part of why it's favored for dressing infected wounds.

What's less certain: eating Manuka for general health, immunity, or gut health. Those claims go beyond the current evidence; its proven strengths are topical.

Medical-grade vs. food-grade. Medical-grade Manuka is sterilized and made for open wounds on the skin. For a sore inside your mouth, which is never sterile anyway, food-grade Manuka or a honey gel is fine.

Put together: honey has trial support for canker sores, and Manuka is the honey with the strongest track record for healing wounds. It's also handy to have one honey that does double duty for cuts and minor burns.

If You Buy Manuka: UMF, MGO, and KFactor

If you decide to buy Manuka, the labeling is confusing, and some of it tells you more than the rest.

UMF (Unique Manuka Factor)

UMF is a grading system run by the UMF Honey Association in New Zealand. UMF-certified honey is independently tested for markers that confirm it's genuine Manuka (leptosperin), for its methylglyoxal (MGO) level and the compound it forms from (DHA), and for a marker of heat damage and age (HMF). A higher UMF number means more MGO.

MGO

Some brands label the MGO content directly instead. That tells you the antibacterial compound level, but not the authenticity and freshness information UMF includes. From a reputable producer that uses independent testing, MGO labeling is fine. As a rough guide, MGO 514 corresponds to about UMF 15.

KFactor

KFactor is a grading system used by one brand (Wedderspoon). It's based on how much Manuka pollen the honey contains, not on its MGO level, and it isn't certified by an independent body. Pollen content doesn't tell you the MGO level, so a KFactor number doesn't give you the same information as UMF or MGO.

Fakes

Genuine Manuka honey is scarce and expensive, and there's a long-standing problem with honey being sold as Manuka that isn't. Independent certification is the main protection against that.

Which grade?

There's no evidence on which grade, if any, works best for canker sores, because grades haven't been tested. Higher grades have more antibacterial activity, which may or may not matter for an immune-driven sore. If you're buying Manuka anyway, a UMF 10+ or equivalent MGO-labeled product from a producer that uses independent testing is a reasonable middle ground; you don't need the most expensive jar on the shelf.

How to Use Honey on a Canker Sore

1. Gently dry the area around the sore with a clean tissue or cotton swab. Saliva dilutes honey quickly.
2. Dab a small amount of honey or honey gel directly onto the sore.
3. Try to keep your mouth still for a minute or two so it stays put.
4. Avoid eating or drinking for about 20–30 minutes.
5. Repeat a few times a day, including at bedtime, when it can stay on longest.

It may sting briefly on application, which is normal.

Who shouldn't use it: never give honey to a baby under 12 months, because of the risk of infant botulism. People with diabetes should be aware that a little honey is absorbed, though the amounts involved are small. Anyone allergic to bee products or pollen should avoid it.

What to expect: in the trials, honey reduced pain and redness and helped sores shrink about as well as, or better than, a steroid paste. It's a reasonable thing to try alongside other measures, but it isn't a guaranteed fix.

How Honey Compares to Other Options

• Numbing gels (benzocaine) work faster for pain, within a minute or two, but wear off quickly and don't help the sore heal. Better before meals.
• Barrier patches protect the sore for longer than honey stays on, without any taste. See Best Canker Sore Patches.
• Prescription steroid pastes are the standard treatment. In head-to-head trials, honey did as well or better, but steroids have a much larger body of evidence overall. See How to Get Rid of a Canker Sore Fast.
• Hydrogen peroxide isn't a good substitute. At drugstore strength it irritates the healing tissue. See Hydrogen Peroxide for Canker Sores.

For an evidence-ranked look at the other home remedies, see Do Home Remedies for Canker Sores Actually Work?.