# New Zealand Spinach (Tetragonia tetragonoides)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/new-zealand-spinach
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-29
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Tetragonia tetragonoides, warrigal greens, Botany Bay spinach, sea spinach, New Zealand ice plant, tetragon, warrigal cabbage

## Overview

New Zealand spinach (Tetragonia tetragonoides) contains bioactive flavonoids, saponins, and oxalic acid derivatives that modulate lipid [metabolism](/ingredients/condition/weight-management) and xanthine oxidase activity. Its 70% ethanol extract has demonstrated anti-obesity and uric acid-lowering effects primarily through inhibition of adipogenic pathways and purine catabolism enzymes in preclinical models.

## Health Benefits

• Anti-obesity effects demonstrated in preclinical mouse studies using 70% ethanol extract (preliminary evidence only)
• Anti-hyperlipidemia activity shown in high-fat diet mouse models (no human studies available)
• Anti-hyperuricemic properties observed in animal research (human clinical trials lacking)
• Rich source of iron, beta-carotene, and vitamins A, C, E, K (nutritional analysis, not clinical studies)
• Contains flavonoid glycosides including 6-methoxykaempferol derivatives (bioactive compounds identified, mechanisms unproven)

## Mechanism of Action

New Zealand spinach extract appears to suppress adipogenesis by downregulating PPAR-γ and C/EBPα transcription factors, reducing fat cell differentiation in high-fat diet mouse models. Its anti-hyperuricemic action is attributed to xanthine oxidase inhibition by flavonoid constituents, reducing conversion of hypoxanthine to uric acid. Saponin and polyphenol fractions may additionally modulate HMG-CoA reductase activity, contributing to observed reductions in serum triglycerides and [LDL cholesterol](/ingredients/condition/heart-health) in preclinical lipid studies.

## Clinical Summary

All current evidence for New Zealand spinach derives from preclinical animal studies; no human randomized controlled trials have been published to date. Mouse models using high-fat diets treated with 70% ethanol extract demonstrated reductions in body weight gain and serum lipid markers, though exact dosages varied across studies. Anti-hyperuricemic effects were observed in rodent models of uric acid overload, with statistically significant reductions in serum urate levels compared to controls. The overall evidence base is preliminary and insufficient to establish efficacy, dosing guidelines, or safety profiles for human supplementation.

## Nutritional Profile

{"macronutrients": {"protein": "2.1 g per 100 g", "fiber": "2.0 g per 100 g", "carbohydrates": "3.5 g per 100 g", "fat": "0.3 g per 100 g"}, "micronutrients": {"vitamins": {"vitamin_A": "8000 IU per 100 g", "vitamin_C": "30 mg per 100 g", "vitamin_E": "2.1 mg per 100 g", "vitamin_K": "960 mcg per 100 g"}, "minerals": {"iron": "3.5 mg per 100 g", "calcium": "65 mg per 100 g", "magnesium": "54 mg per 100 g", "potassium": "380 mg per 100 g"}}, "bioactive_compounds": {"beta-carotene": "4500 mcg per 100 g"}, "bioavailability_notes": "Contains oxalates which may reduce the bioavailability of calcium and iron. Cooking can reduce oxalate content, enhancing mineral absorption."}

## Dosage & Preparation

No clinically studied dosage ranges are available as no human trials exist. Preclinical mouse studies used 70% ethanol extracts without specific dose translations for humans. Traditional culinary use involves blanching leaves in hot water to reduce oxalate content before consumption. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

New Zealand spinach contains moderate-to-high levels of oxalic acid, which can bind dietary calcium and potentially contribute to calcium oxalate kidney stones in susceptible individuals, particularly those with a history of nephrolithiasis. The plant also contains saponins that may cause gastrointestinal irritation, including nausea or diarrhea, at high intake levels. No formal drug interaction studies exist, but theoretical interactions with allopurinol (additive uric acid lowering) and lipid-lowering medications (statins) are plausible given overlapping mechanisms. Pregnant and breastfeeding women should avoid concentrated extracts due to the complete absence of safety data in these populations.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses have been conducted on Tetragonia tetragonoides. The only available evidence comes from a single preclinical mouse study using a high-fat diet-induced obesity model, which showed anti-obesity, anti-hyperlipidemia, and anti-hyperuricemic effects with 70% ethanol extract.

## Historical & Cultural Context

Known as warrigal greens or Botany Bay spinach, it was recognized as edible by some Australian Aboriginal groups but often avoided due to high oxalic acid content that outweighed minimal nutritional benefits. Unlike many traditional medicinal plants, there's no documented use in formalized medicine systems like Ayurveda or TCM.

## Synergistic Combinations

Iron supplements, Vitamin C, Calcium citrate, Magnesium glycinate, Vitamin D3

## Frequently Asked Questions

### Does New Zealand spinach lower uric acid levels?

Animal studies suggest New Zealand spinach extract can reduce serum uric acid by inhibiting xanthine oxidase, the enzyme that converts purines into uric acid. However, no human clinical trials have confirmed this effect, so it cannot currently be recommended as a treatment or supplement for gout or hyperuricemia in people.

### What are the active compounds in New Zealand spinach?

New Zealand spinach contains flavonoids, saponins, oxalic acid derivatives, and polyphenolic compounds identified as the primary bioactive constituents. Flavonoids are credited with xanthine oxidase inhibition, while saponins and polyphenols may contribute to the observed anti-lipidemic and anti-adipogenic effects seen in mouse models.

### Is New Zealand spinach safe to eat every day?

As a whole food, New Zealand spinach is generally considered safe for regular consumption, though its elevated oxalic acid content warrants caution for individuals prone to calcium oxalate kidney stones. Concentrated extracts or supplements lack human safety data, and daily high-dose supplementation is not supported by current evidence.

### How does New Zealand spinach differ from regular spinach?

New Zealand spinach (Tetragonia tetragonoides) belongs to the Aizoaceae family, not the Amaranthaceae family like common spinach (Spinacia oleracea), making it botanically distinct despite similar culinary use. It tends to have slightly different oxalate profiles and contains saponins not prominently found in common spinach, while sharing broadly comparable micronutrient content including vitamins A, C, and K.

### Can New Zealand spinach help with weight loss?

Preclinical mouse studies using a 70% ethanol extract demonstrated reduced body weight gain and decreased fat accumulation linked to downregulation of PPAR-γ and C/EBPα, key regulators of adipogenesis. These findings are promising but entirely preliminary; no human studies have been conducted, and no evidence-based weight loss dosage for humans has been established.

### Is New Zealand spinach safe during pregnancy and breastfeeding?

New Zealand spinach is generally recognized as safe as a food source during pregnancy and breastfeeding due to its nutrient density, particularly its iron and folate content which support fetal development. However, specific clinical safety studies in pregnant or nursing populations are limited, so consultation with a healthcare provider before using supplements or concentrated extracts is recommended. As a whole food vegetable consumed in normal dietary amounts, it is considered a beneficial addition to pregnancy nutrition.

### Does New Zealand spinach interact with blood thinners or anticoagulant medications?

New Zealand spinach is high in vitamin K, which plays a role in blood clotting and may interact with warfarin (Coumadin) and other anticoagulant medications by reducing their effectiveness. Individuals taking blood-thinning medications should maintain consistent vitamin K intake and consult their healthcare provider before significantly increasing New Zealand spinach consumption. Sudden large increases in dietary vitamin K from leafy greens can interfere with anticoagulant dosing and medication efficacy.

### What does the research quality show about New Zealand spinach's health benefits?

Most evidence for New Zealand spinach's therapeutic benefits (anti-obesity, anti-hyperlipidemia, anti-hyperuricemic effects) comes from preclinical animal studies using concentrated extracts, with no published human clinical trials currently available. The nutritional profile—iron, beta-carotene, and vitamins A, C, E, K—is well-established through standard nutrient analysis, supporting its classification as a nutrient-dense food. Stronger human clinical evidence would be needed to make definitive health claims beyond its recognized role as a nutritious vegetable in a balanced diet.

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