Manuka Honey MGO Ratings: What MGO 400+ Actually Means
The numbers on manuka jars are not marketing invention. They measure something specific, and most people do not know what.
What does MGO 400+ mean in manuka honey?
MGO 400+ means the honey contains at least 400 mg/kg of methylglyoxal, the compound primarily responsible for manuka's non-peroxide antibacterial activity. MGO is a direct measurement of that compound. Higher numbers indicate greater concentration — MGO 400+ is considered a high therapeutic grade, well above entry-level manuka sold as table honey, which typically rates MGO 30 to 100.
What the numbers measure
Manuka honey grading exists because manuka has an antibacterial mechanism that other honeys lack, and the strength of it varies enormously between batches.
All honey has some antibacterial activity from hydrogen peroxide produced by an enzyme the bee adds. That activity is fragile — heat, light and the enzyme catalase in body tissue all destroy it.
Manuka has a second, non-peroxide activity that is stable. It comes from methylglyoxal, which forms from dihydroxyacetone present in manuka flower nectar, converting gradually as the honey matures.
MGO is a direct measurement: milligrams of methylglyoxal per kilogram of honey. MGO 400+ means at least 400 mg/kg.
The competing grading systems
| System | What it measures | Rough equivalence |
|---|---|---|
| MGO | Methylglyoxal concentration in mg/kg — direct chemical assay | MGO 83 ≈ UMF 5 MGO 263 ≈ UMF 10 MGO 400 ≈ UMF 13 MGO 514 ≈ UMF 15 |
| UMF | Unique Manuka Factor — tests methylglyoxal, DHA and leptosperin together, plus authenticity | Broader; includes markers verifying genuine manuka |
| KFactor | Pollen count and purity focused rather than activity focused | Not directly comparable to MGO |
| Bio Active / Active | Often no verified assay behind it | Treat with scepticism |
MGO 400+ manuka, delivered where contact matters
BreathEaseX is a spray specifically so the manuka reaches throat and upper airway tissue directly.
Where MGO 400+ sits
For context on the scale: manuka sold as ordinary table honey commonly rates MGO 30 to 100. Mid-range therapeutic grades sit around MGO 250. MGO 400+ is a high grade, and grades above MGO 800 exist at considerably higher cost.
MGO 400+ is a genuine step above supermarket manuka rather than a nominal one.
Why delivery format matters here
This is the part relevant to a spray rather than a capsule.
Manuka's studied properties concern direct contact with tissue — it has been examined in wound care and mucosal applications, with therapeutic manuka honey reviewed in the microbiology literature. The mechanism is contact-dependent.
Honey inside a capsule that dissolves in the stomach never touches the throat or upper airway. Whatever contact-dependent activity it has is simply not deployed. A spray puts it on the tissue.
This is a case where the delivery format is doing real mechanistic work rather than serving as a novelty.
What manuka does not do
It does not reach the lower airways or alveoli. A spray coats the oral cavity, throat and to some extent the upper pharynx. It does not travel down the bronchial tree, and any claim that it does is not physiologically plausible.
It is also not a treatment for respiratory infection, and it should not delay appropriate medical care.
One practical caution: honey is sugar. In a spray the total quantity is small, but anyone managing blood glucose closely should be aware of it. And honey should never be given to infants under twelve months due to botulism risk — irrelevant to an adult product but worth stating.
