Elemental profiling routinely finds that soil-derived elements such as calcium, potassium, magnesium, manganese and sodium (and trace elements like boron, rubidium and phosphorus) vary by harvest region and show up in honey in predictable patterns. These elemental signatures, when combined with molecular markers (for example leptosperin, methyl syringate derivatives, 2-methoxyacetophenone and related phenolics), form a chemical “passport” that labs use to verify provenance and detect mislabeling and adulterated Manuka.
Regional mineral mixes also relate to non-MGO chemistry; honey from different soils shows measurable differences in total phenolic and flavonoid content (a major part in Manuka's antioxidant system) and in the relative abundance of phenolic metabolites that contribute to flavor and bioactivity. Several studies that sampled New Zealand honeys report that elemental profiles can separate geographic regions statistically, and work that examines plant, soil and honey together shows correlations (and in some cases inverse relationships) between specific elements and MGO/DHA levels.
Recent metabolomic fingerprinting using REIMS/LA-REIMS has shown that Leptospermum honeys from New Zealand and Australia have distinct molecular profiles even when matched for MGO, demonstrating country-level separation beyond just MGO values; earlier marker studies also found certain compounds (for example leptosperin and 2-methoxybenzoic acid) at different concentrations across origins. That does not mean every NZ jar is “better” by a single metric, but it does show New Zealand Manuka has a reproducible, distinguishable chemical expression compared to Australia's.
Our Manuka is produced in Taranaki, which is a respected source. The region’s volcanic-derived tephra and ash soils produce distinct soil chemistries that influence plant and nectar composition. Remote, wind-exposed Manuka stands in Taranaki experience stressors known to affect nectar chemistry (producing more DHA/MGO), so Taranaki honey commonly carries a detectable mineral signature and a character (minerality, herbaceous tone) prized by graders.
https://pmc.ncbi.nlm.nih.gov/articles/PMC7178798/
https://www.nature.com/articles/s41538-018-0016-6
https://pubmed.ncbi.nlm.nih.gov/34033993/
https://pmc.ncbi.nlm.nih.gov/articles/PMC8303644/
https://pmc.ncbi.nlm.nih.gov/articles/PMC6613335/
https://www.agresearch.co.nz/news/manuka-honey-country-of-origin-breakthrough/
https://www.umf.org.nz/wp-content/uploads/2024/03/2023-REIMS-Ross.pdf
https://www.mpi.govt.nz/dmsdocument/31122/direct