Jarrah honey has high antibacterial activity in laboratory testing.
In a screen of 477 Australian honeys, jarrah was among the few with exceptional in-vitro antibacterial activity. As in most honeys, the activity came from hydrogen peroxide, generated by the bees' glucose oxidase when honey is diluted, and it declined in storage, faster at 25 °C than at 4 °C. Why jarrah generates so much is not established by that work. This is laboratory activity against organisms in a dish.
What this does not claim: It is not evidence that eating jarrah honey fights infection. Peroxide activity is destroyed by catalase, an enzyme present in human tissue and blood, and it degrades with heat and storage. No clinical trial supports a therapeutic claim for jarrah honey, and the TA number on a jar predicts nothing about what happens after swallowing.
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