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Facts about the skin from DermNet New Zealand Trust. Topic index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z



Honey

For centuries now honey has been used as an effective remedy for wounds, burns and ulcers. In recent years there has been renewed interest in the medicinal properties of honey. Much of this research is being carried out by a team of people working at the Waikato Honey Research Unit, New Zealand.

How does honey work to treat infections?

There are many features in the composition of honey that together combine to give it its antimicrobial properties.

Feature Antimicrobial action
High osmolality Honey is a saturated or supersaturated solution of sugars that has strong interaction with water molecules. The lack of ‘free’ water inhibits the growth of microorganisms.
Hydrogen peroxide When honey is diluted by wound exudates, hydrogen peroxide is produced via a glucose oxidase enzyme reaction. This is released slowly to provide antibacterial activity but does not damage tissue.
Antibacterial phytochemicals Some honeys still have antimicrobial activity even when hydrogen peroxide activity has been removed. The honey from Manuka trees (Leptospermum scoparium) has been found to have high levels of this antibacterial phytochemical.

In addition to its antimicrobial properties, honey also appears to stimulate lymphocytic and phagocytic activity. These are key body immune responses in the battle against infection.

What is honey used to treat?

Honey is most commonly used as a topical antibacterial agent to treat infections in a wide range of wound types. These include:

In most cases, honey is used when conventional antibacterial treatment with antibiotics and antiseptics are ineffective. Numerous studies have shown that these difficult-to-heal wounds respond well to honey dressings. Inflammation, swelling and pain rapidly subside, unpleasant odours stop, debridement is enhanced as the honey dressings remove dead tissue painlessly and without causing damage to the regrowing cells. Honey promotes rapid healing with minimal scarring.

Honey can also be used as first aid treatment for burns as it has potent anti-inflammatory activity.

What honey to use?

For centuries it has been known that different types of honey exhibit differences in antibacterial activity. In recent years, honey from different sources have been studied and a few have been identified as having particularly high antibacterial activity. Manuka honey gathered from the manuka tree Leptospermum scoparium, native to New Zealand, has exceptionally high antibacterial activity, with about half of this type of honey having high levels of non-peroxide activity (ie: high levels of antibacterial phytochemical activity present). It is important for honey to have this additional non-peroxide antibacterial component as factors such as acidity, catalase and protein-digesting enzymes in wound fluids all work towards reducing the hydrogen peroxide antibacterial effectiveness.

For the treatment of infected wounds, it is important that a sterilised, laboratory-tested honey for medicinal purposes is used. Honey produced from manuka trees is tested for antibacterial activity and given a potency rating called a UMF (Unique Manuka Factor). The higher the UMF rating, the greater the level of antibacterial activity. Medical professionals in New Zealand use active manuka honey with a rating of UMF 10 or higher. UMF graded honey is also sterilised by gamma irradiation without loss of any antibacterial activity.

How to use honey on wounds

All difficult to heal wounds should be seen by your doctor. The following are general tips on how honey may be used for wound care.

Related information

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Author: Vanessa Ngan, staff writer

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