Educational information, not medical advice — ask your doctor or midwife.
Pipturus albidus, known in Hawaii as māmaki, is a small tree in the nettle family. Its dried leaves are brewed as a mild, caffeine-free tea. Most people drink it as an everyday hot drink.
Unlike most nettles, māmaki has no stinging hairs. It grows wild only in Hawaii, mainly in damp forest. Hawaiian families have used the leaf tea for generations.
Here is the honest verdict on the evidence. Lab work has mapped the plant's plant compounds in good detail. Controlled trials in people are all but absent.
So long use in tradition is not proof that it works, and it is not proof that it is safe. Treat it as a pleasant tea, not as a treatment.
No one has shown in people how māmaki tea acts in the body.
In lab tests, leaf extracts mop up free radicals (unstable molecules that can harm cells). The leaves hold rutin, chlorogenic acid and catechins. These same compounds turn up in apples, buckwheat and green tea.
In test tubes, some extracts slow enzymes linked to swelling and pain. A few animal studies hint at effects on blood sugar and fat levels. The work is small and early.
A cup of tea is far weaker than a lab extract. Hot water pulls out only part of what the leaf holds. Whether any of the lab effects happen inside a person is not known.
Māmaki reaches most buyers as a tea.
Common forms:
- Loose dried leaf - Tea bags, plain or blended - Blends with hibiscus, lemongrass or ginger - Powdered leaf - Capsules and extract drops, less often - Fresh leaf, mainly in Hawaii
Most Hawaiian growers sell whole dried leaf. Blends taste milder, but they also give you less māmaki per cup. Check the label if you want to know what you are drinking.
Strength is not listed in any standard way. One brand's cup may be much stronger than another's.
Māmaki was a well-known plant in old Hawaii, used for far more than tea. Written records of these uses date mainly from the 1800s onward.
Traditional uses recorded by Hawaiian sources and later writers included:
- Leaf tea as a general tonic and daily drink - Leaf tea for tiredness and low spirits - The small white fruit for sores in the mouth - Preparations for sluggish digestion - Inner bark beaten into kapa, a cloth
The plant also feeds the Kamehameha butterfly, which made it a familiar sight in wet forest. Interest in growing it has grown again since the 1990s.
This page records what was done in the past. It does not suggest you copy those uses yourself.
Stop drinking it and get urgent care if you get a spreading rash, swelling of the face or lips, or trouble breathing.
See your doctor soon if you get stomach pain, vomiting or dark urine after starting it.
Also see your doctor if the problem you hoped the tea would help has not improved in two weeks. Tiredness, stomach trouble and high blood pressure all need a proper check.
In the United States, māmaki is sold as an ordinary herbal tea or dietary supplement. The FDA does not check it before sale and no health claims are approved. Outside the US it is uncommon, and some countries may restrict it as a novel food, so check local rules.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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