Diabetic Foot Ulcers: Three Trials, Three Different Answers

The most-studied wound application

Diabetic foot ulcers (DFUs) are where manuka honey has the largest body of randomized controlled trial evidence. There are good reasons. DFUs are common, clinically important, often resistant to standard treatment, and their healing rate is straightforward to measure. Honey-impregnated dressings are practical to apply and easy to blind in some study designs.

Three trials between 2013 and 2017 are most often cited. They produced three quite different results, and understanding why is more useful than picking a single conclusion.

Al Saeed 2013

Al Saeed, working in Saudi Arabia, randomized 63 patients with infected diabetic foot ulcers into a manuka honey group and a conventional saline-dressing control. Outcomes at six weeks: 61.3 percent complete healing in the honey arm versus 11.5 percent in the control. At six months: 87.1 percent versus 42.3 percent. Toe amputations were also fewer in the honey arm (9.7 percent versus 34.6 percent). This is the study most often cited by manuka producers, and it is genuinely striking.

It also has limitations. The control was saline dressing, not modern wound care. The trial was unblinded by necessity. And the specific manuka product was not standardized to a publicly verifiable UMF grade in the published report. The effect size is real but the comparator was conservative.

Tsang 2017

Tsang and colleagues in Hong Kong ran a three-arm pilot with 31 patients comparing nanocrystalline silver, manuka honey, and conventional dressing. Complete ulcer healing rates were 81.8 percent for silver, 50 percent for manuka, and 40 percent for conventional. Silver beat manuka, manuka beat conventional, and the differences were not always statistically significant given the small sample.

This trial is uncomfortable for the manuka case but informative. Against modern silver-based dressings, the established competitor in advanced wound care, manuka is not the front-runner. It is competitive with conventional treatment but not categorically superior to alternatives.

Kamaratos 2014

Kamaratos and colleagues in Greece ran 63 patients with neuropathic diabetic foot ulcers (a specific subtype, not the most aggressive). The honey group showed faster healing time and lower infection rates than the conventional dressing group. The result is positive and cleaner than Al Saeed because the ulcer subtype was constrained, but the comparator was again conventional rather than silver.

Why the spread

Four variables explain most of the disagreement:

Comparator. Manuka beats saline. It is comparable to or somewhat behind silver. A trial's headline number depends entirely on what the other arm got.

Ulcer type. Neuropathic ulcers behave differently from infected or ischemic ones. Sub-population matters more than overall healing rates.

Honey grade. Most published trials do not specify the MGO concentration of the manuka used. The gap between MGO 250 and MGO 800 is substantial in vitro and presumably also in vivo.

Trial size. All three trials are small (31 to 63 patients). None individually has enough statistical power to settle the question.

What the evidence supports

A reasonable summary: manuka honey dressings are a viable option for diabetic foot ulcer care, particularly when modern silver dressings are unavailable or contraindicated. They are not, on current evidence, the first-line choice in settings where silver is available. They appear to be more useful for neuropathic ulcers than for ischemic or severely infected ones, though that distinction is not well-tested.

The Cochrane review on honey for wound healing, last meaningfully updated in 2015, declined to recommend honey as a standard treatment but acknowledged the evidence is not negative. That stance has held. No subsequent trial has produced the kind of large, multicenter, rigorous result that would shift it.

The practical implication

For a clinician, manuka has a defensible place in the wound-care arsenal but should not replace established advanced dressings without reason. For a consumer, this is the kind of application that should never be self-managed for a serious wound. The trials that show benefit are using sterile, medical-grade products under clinical supervision, not table honey on a kitchen towel.