The single most important thing to look for when buying manuka honey is a verified grading number on the label, either UMF or MGO. Without one of these ratings, you have no reliable way to know what you’re getting. Beyond that, the right grade depends on what you plan to use it for, and a few label details can help you spot fakes before you waste money on a jar that isn’t what it claims to be.
Understanding UMF and MGO Ratings
Manuka honey is graded by the concentration of methylglyoxal, the compound responsible for its antibacterial activity. You’ll see this expressed two ways: MGO (a direct measurement in milligrams per kilogram) and UMF (a broader quality score used by New Zealand producers that factors in additional markers). Both are legitimate, and they roughly convert like this:
- UMF 5+ / MGO 83+: Entry-level manuka, works as a culinary sweetener
- UMF 10+ / MGO 263+: Moderate activity, suitable for daily wellness
- UMF 15+ / MGO 514+: High activity, meaningful immune support
- UMF 18+ / MGO 696+: Strong antibacterial properties
- UMF 20+ / MGO 829+: Premium grade, maximum potency
These are minimum thresholds, so actual MGO content can vary slightly between batches. If a jar only says “manuka honey” without listing a UMF or MGO number, treat it with skepticism. Some brands use proprietary grading systems that sound official but aren’t independently verified.
Choosing the Right Grade for Your Purpose
If you’re buying manuka honey as a spread or sweetener, you don’t need to spend on a high-grade jar. MGO 83+ (UMF 5+) is fine and costs significantly less. For general wellness, like adding it to tea or taking a spoonful daily, MGO 263+ offers moderate antibacterial activity without the premium price tag.
If you’re looking for active antibacterial benefits, research suggests MGO 400+ provides meaningful activity. Clinical settings typically use honey rated MGO 550+ or higher, though that medical-grade honey undergoes gamma irradiation to sterilize it without destroying its bioactive compounds. You can’t buy medical-grade manuka at a grocery store, but a high-rated food-grade jar (MGO 514+ or above) delivers potent antibacterial properties for personal use.
Monofloral vs. Multifloral
You’ll sometimes see manuka honey labeled “monofloral” or “multifloral,” and this distinction matters more than many buyers realize. Monofloral manuka comes predominantly from the nectar of one plant species (Leptospermum scoparium) and carries higher MGO concentrations. Multifloral manuka is blended with nectar from other flowers, which dilutes the active compounds. It typically grades at UMF 5+ or below.
Multifloral manuka is more affordable and works well as an everyday honey. But if you’re paying for therapeutic benefits, make sure the label says monofloral or shows a UMF rating above 5+.
New Zealand vs. Australian Manuka
New Zealand dominates the manuka honey market, and its honey comes from a single species of Leptospermum tree. Australia has 87 species of Leptospermum, 15 of which produce bioactive honey with high MGO levels. Australian producers claim some of their varieties yield the highest MGO potencies in the world due to elevated levels of the precursor compound that converts into methylglyoxal over time.
Both countries produce genuine manuka honey, but their labeling standards differ. New Zealand’s UMF system is tightly regulated through the UMF Honey Association. Australian manuka may use MGO ratings or other certifications. Neither origin is inherently better, but New Zealand’s verification infrastructure makes it easier for consumers to confirm what they’re buying.
How to Verify Authenticity
Manuka honey fraud is a well-documented problem. Global sales of “manuka honey” far exceed actual production volumes, which means counterfeit and diluted products are common. Here’s how to protect yourself:
Look for a UMF trademark on the label. Genuine UMF-certified jars carry a four-digit license number, usually on the side or back of the product. You can enter this number on the UMF Honey Association’s website (umf.org.nz) to confirm the producer holds a valid license. Each jar also has a batch number that traces it back to specific lab test results verifying its bioactivity levels and quality.
Genuine manuka also contains a compound called leptosperin, found exclusively in Leptospermum nectar at concentrations between 100 and 1,000 mg/kg. Some testing standards use leptosperin as an authenticity marker. You won’t see this on most consumer labels, but it’s part of what certified grading systems verify behind the scenes.
A few red flags to watch for: prices that seem too low for the stated grade (UMF 15+ honey is expensive to produce), missing or vague grading information, and brands that can’t be found in the UMF certification database.
Price Expectations by Grade
Manuka honey costs more than conventional honey at every grade, and prices rise steeply with MGO concentration. A jar of UMF 5+ multifloral manuka might cost $15 to $25. UMF 10+ typically runs $30 to $50. Once you reach UMF 15+ and above, expect $50 to $80 or more for a standard 250g jar. UMF 20+ can exceed $100.
If you find a jar labeled UMF 20+ for $30, that’s a strong signal something is wrong. The raw honey itself is scarce at those concentrations, and legitimate producers price accordingly. Buying from established brands with verifiable UMF licenses is the most reliable way to ensure your money goes toward actual high-grade manuka rather than a convincing label on ordinary honey.