Mānuka honey is one of the most studied natural foods on earth. It's also a sugar, a potent biological compound, and — for a small number of people — something that deserves a second look before it becomes part of your daily routine.
This isn't a scare piece. It's the honest version of a conversation we think every informed adult deserves to have.
What Makes Mānuka Honey Different in the First Place
Before we talk about who should be careful, it's worth being clear on what sets mānuka apart from regular honey — because the very properties that make it compelling are also the reason some people need to pay closer attention.
Genuine East Cape mānuka honey contains methylglyoxal (MGO), a compound formed from dihydroxyacetone (DHA) naturally present in mānuka blossom nectar. MGO is what gives mānuka honey its distinctive character and is the basis for the UMF and MGO rating systems you'll see on reputable labels.
Our NZ Country Mānuka Honey is sourced from the East Cape of New Zealand — one of the most remote and biodiverse mānuka regions on earth — and is GC-MS tested to verify authenticity and potency. That's not a marketing claim. It's a lab result.
High-MGO honey behaves differently from supermarket honey. That distinction matters for a handful of specific groups.
People with Diabetes or Blood Sugar Concerns
This is the most important conversation in this article, so we'll be direct.
Mānuka honey is still honey. It contains approximately 70–80% sugars — predominantly fructose and glucose — and will raise blood glucose levels. A standard teaspoon (roughly 7g) carries around 5–6g of sugar. A tablespoon is considerably more.
Some research suggests that mānuka honey may produce a lower glycaemic response than refined sugar or some processed foods, and animal studies have explored its relationship with insulin response. But this is not a green light. If you are managing type 1 or type 2 diabetes, are insulin-resistant, or are monitoring carbohydrate intake on medical advice, mānuka honey is something to discuss with your GP or endocrinologist before you start — not after.
Topical use (applying mānuka honey to the skin rather than consuming it) is a separate matter and carries far less systemic sugar impact. But again, if you have diabetes-related skin conditions, your doctor is the right first call.
"I love the idea of mānuka but my diabetes nurse and I spoke about it first. Once I knew the right amount for me, it became a small daily ritual I actually look forward to." — Helen R., Wellington
Infants Under 12 Months — A Hard Line
This one is non-negotiable, and it applies to all honey — not just mānuka.
Honey of any kind should never be given to infants under the age of 12 months. The reason is the risk of infant botulism: a serious illness caused by Clostridium botulinum spores that can be present in honey. An adult's digestive system handles these spores without issue. An infant's developing gut cannot.
No UMF rating, no MGO level, no amount of GC-MS testing changes this. The guidance from Plunket NZ, the Ministry of Health, and paediatric organisations worldwide is consistent and clear: no honey before 12 months.
This includes honey used in cooking if the food is intended for infants, and honey-based products applied near an infant's mouth.
After the first birthday, the picture changes — but if you have any questions specific to your child, a Plunket nurse or your GP is your best resource.
Allergies to Bees, Pollen, or Related Compounds
Mānuka honey is a bee product, and like all bee products it contains trace proteins that can trigger reactions in sensitive individuals. If you have a known allergy to bee stings, bee venom, pollen, or other bee products such as propolis or royal jelly, there is an elevated risk that honey — including mānuka honey — may cause an allergic response.
Reactions can range from mild oral itching or tingling (sometimes called oral allergy syndrome) through to more significant responses. People with severe bee-related allergies should consult an allergist before consuming or topically applying mānuka honey.
If you're trying mānuka honey for the first time and have any history of atopy (eczema, hay fever, asthma), it's sensible to start with a very small amount and observe your response before making it a daily practice.
People on Certain Medications
Mānuka honey is a biologically active food. While it doesn't have the dramatic drug-interaction profile of something like grapefruit, there are a few situations worth flagging.
- Chemotherapy patients: Some oncology units ask patients to avoid high-MGO honey during active treatment because of potential interactions with certain protocols. If you're in cancer treatment, check with your oncologist before adding any potent supplement or functional food.
- Blood-thinning medications: There is limited but emerging research looking at honey's potential effect on platelet function. If you're on anticoagulants such as warfarin, it's worth mentioning mānuka honey to your prescribing doctor.
- Immunosuppressants: If you're taking medication that intentionally modulates your immune response — post-transplant therapy, for example — discuss any new dietary additions with your specialist.
In most of these cases the concern is about quantity and frequency, not a blanket prohibition. Your pharmacist or specialist is better placed than any article on the internet to give you guidance specific to your situation.
Digestive Sensitivity — When More Isn't Better
Some people who introduce mānuka honey find that taking too much, too quickly causes mild digestive upset — bloating or loose stools are the most commonly reported effects. This tends to happen when people start with large quantities rather than building up gradually.
The practical guidance is straightforward: start with half a teaspoon, see how your system responds, and work up from there if you're comfortable. There's no evidence that consuming large amounts delivers proportionally more benefit — and your gut will thank you for not treating the jar like a race.
"I was taking a full tablespoon from day one and wondered why my stomach was complaining. Dropped back to a teaspoon and it's been fine ever since." — Marcus T., Christchurch
Pregnancy and Breastfeeding
Mānuka honey is generally considered safe for pregnant and breastfeeding adults in culinary amounts — the same way other honeys are. There is no established evidence of harm at normal dietary intake levels.
That said, very high daily doses of any biologically active food during pregnancy fall into the "check with your midwife or obstetrician" category. If you're taking mānuka honey therapeutically — meaning more than the occasional spoonful — have that conversation before you're deep into a routine.
The infant botulism caution extends to honey being transmitted through breast milk only in extreme theoretical terms; this is not a documented or established risk in the literature. But as with anything in pregnancy, your LMC is your best sounding board.
High-UMF Honey Is More Potent — Scale Accordingly
A UMF 5+ honey and a UMF 20+ honey are not the same thing, in the same way that a mild olive oil and a cold-pressed extra virgin are not interchangeable in every recipe. The methylglyoxal content scales significantly with UMF rating, and so does the intensity of the biological activity.
Most of the research on mānuka honey's properties uses mid-to-high MGO preparations. For everyday culinary use — stirring into yoghurt, taking in warm water, using as a food ingredient — a UMF 10+/MGO 263+ is a reasonable starting point. Reaching for the highest UMF you can find and consuming it by the spoonful several times a day isn't the goal, and for some of the groups mentioned above it carries more risk than benefit.
Our NZ Country Mānuka Honey carries clear MGO certification and is GC-MS lab-verified — so you always know exactly what you're working with. That transparency matters when you're making informed decisions about how much and how often.
Topical Use vs. Oral Use — Different Risk Profiles
Much of the caution in this article applies primarily to eating mānuka honey. Topical application — using it on skin — carries a different and generally lower risk profile for most of the groups mentioned here.
Diabetics using mānuka honey on skin, for example, are not consuming the sugars. People with pollen sensitivities may still want to patch-test, but systemic allergic exposure via skin contact is less likely than via ingestion for most people.
If you're drawn to the traditional Māori rongoā uses of mānuka — Leptospermum scoparium has a long documented history of topical application in Māori wellness practice — and you're uncertain about internal use, topical may be the sensible starting point.
For those who want to explore mānuka honey in a skincare context, our tallow-based formulation — which combines traditional mānuka with grass-fed tallow — is currently in development. Join the waitlist here →
What Side Effects Actually Look Like — and When to Stop
In practice, the vast majority of adults who use mānuka honey within sensible amounts experience no adverse effects at all. The reported issues that do arise tend to be:
| What People Notice | Most Likely Cause | What to Do |
|---|---|---|
| Digestive upset, bloating | Too much, too fast | Reduce to ½ tsp, build slowly |
| Oral itching or tingling | Possible pollen sensitivity | Stop use; speak to GP if persists |
| Skin redness at application site | Patch sensitivity or contact | Patch-test first; discontinue if reaction continues |
| Blood sugar fluctuation | Sugar content of honey | Diabetics: discuss with GP before use |
| No effect noticed at all | Normal — not all benefits are felt | Consistent use over weeks, not days |
If you experience anything beyond mild and transient digestive adjustment, stop using and speak to a health professional. That's not overcaution — it's just common sense.
The Bigger Picture
Mānuka honey has been used in New Zealand for generations, is backed by a growing body of peer-reviewed research, and is part of a living tradition that long predates the wellness industry's discovery of it. The cases where it warrants caution are specific and relatively rare.
But "natural" has never meant "consequence-free for every person in every circumstance." Knowing who you are, what you're managing, and what you're putting into your body is how you actually benefit from something like this rather than just hoping for the best.
"I'd been burned by so many products that over-promised. What I liked about NZ Country was that they were straight with me about what mānuka honey is and isn't. That's why I trusted it enough to try it." — Diane W., Auckland
If you're ready to add genuine, GC-MS verified East Cape mānuka honey to your routine, start with our NZ Country Mānuka Honey →
Read more:
Mānuka Oil vs. Tea Tree Oil — What's Actually Different →