Kakadu plum is a small, green fruit native to northern Australia that holds the record as the world’s richest known natural source of vitamin C. With up to 3,150 mg of vitamin C per 100 grams of fresh fruit, it contains roughly 50 times more than an orange. Wild-harvested by Indigenous Australian communities for thousands of years, it has recently gained global attention as a superfood ingredient in supplements, skincare, and functional foods.
Where It Grows
Kakadu plum (scientific name Terminalia ferdinandiana) grows wild across the tropical woodlands of northern Australia, primarily in the Kimberley region of Western Australia and the Northern Territory. The tree is deciduous, shedding its leaves during the dry season, and produces small, oval-shaped fruits that are pale green to yellow when ripe. Almost all commercially available Kakadu plum is still wild-harvested rather than farmed, picked by hand from trees scattered across vast stretches of bushland.
Traditional Indigenous Uses
For Indigenous Australian communities, Kakadu plum is far more than a vitamin C source. It has been eaten and used medicinally for generations to treat headaches, colds and flu, and as a natural antiseptic. The fruit holds deep cultural and economic significance for First Nations people, and modern scientific analysis has largely confirmed that the fruit’s dense concentration of bioactive compounds aligns with these traditional applications. Research from the University of Queensland has specifically noted that science is catching up with what Indigenous communities have long known about the fruit’s health benefits.
Vitamin C and Antioxidant Content
The vitamin C numbers are striking. Laboratory analysis of fresh Kakadu plum fruit has found ascorbic acid levels ranging from 2,300 to 3,150 mg per 100 grams. For comparison, oranges contain about 50 mg per 100 grams. That makes Kakadu plum roughly 50 times richer in vitamin C by weight.
But vitamin C is only part of the picture. Kakadu plum is also packed with plant compounds called polyphenols, particularly two potent antioxidants: ellagic acid and gallic acid. The ellagic acid content is especially notable. Pure Kakadu plum powder contains between 600 and 800 mg of free ellagic acid per 100 grams on a dry-weight basis, with total ellagic acid (including bound forms) reaching as high as 2,872 mg per 100 grams. That dwarfs other fruits known for ellagic acid; boysenberry, for instance, contains about 166 mg per 100 grams.
Gallic acid levels are similarly impressive at about 5.1 mg per gram of dried fruit, far exceeding levels in lemons, oranges, and blueberries. Together, these compounds give Kakadu plum exceptionally strong free-radical-scavenging ability. Lab testing shows that ellagic acid and vitamin C content each correlate almost perfectly with the fruit’s antioxidant activity, meaning both contribute significantly to its protective effects.
Health Benefits
The combination of high vitamin C and dense polyphenol content gives Kakadu plum a wide range of potential benefits. Vitamin C is essential for immune function, wound healing, and the production of collagen, the protein that keeps skin, joints, and blood vessels strong. The ellagic acid in the fruit has demonstrated anti-inflammatory, antimicrobial, and antiparasitic properties in laboratory studies. There is also early research suggesting ellagic acid may have protective effects relevant to cancer, diabetes, cardiovascular disease, and neurodegenerative conditions, though most of this work is still preclinical.
Freeze-dried Kakadu plum retains a high proportion of its beneficial compounds. Studies show that freeze-dried fruit still contains about 46.6 mg of ellagic acid per gram, making it a practical way to preserve the fruit’s nutritional value for use in powders and supplements.
Skincare Applications
Kakadu plum extract has become a popular ingredient in serums, moisturizers, and brightening treatments. The appeal is straightforward: vitamin C applied topically stimulates collagen production, which can improve skin elasticity and reduce the appearance of fine lines. It also helps fade dark spots and hyperpigmentation by inhibiting excess melanin production, leading to a more even skin tone. Additionally, vitamin C supports the skin’s barrier function, helping retain moisture and offering some protection against environmental damage from UV exposure and pollution.
Because Kakadu plum delivers vitamin C alongside ellagic acid and gallic acid, skincare products made with the whole extract may offer broader antioxidant protection than synthetic vitamin C alone. That said, the concentration of active ingredients varies widely between products, so not every serum labeled “Kakadu plum” will deliver the same results.
How It’s Sold
You won’t find fresh Kakadu plums at most grocery stores outside Australia. The fruit is primarily available in processed forms: freeze-dried powder, concentrated extracts, capsules, and as an ingredient blended into juices, jams, and functional food products. Pure Kakadu plum powder retains the highest levels of beneficial compounds compared to blended products, so if you’re buying it for nutritional value, check how much actual Kakadu plum is in the product versus fillers or other fruit blends.
The market for Kakadu plum has grown rapidly. The industry’s farmgate value jumped from just over $200,000 Australian dollars in 2012 to $1.6 million in 2019, with projections reaching $3.5 million by 2025. That rapid growth has raised concerns about authenticity and sustainability. Researchers are now developing elemental fingerprinting techniques to verify that products labeled as Kakadu plum actually come from legitimate harvest sites in northern Australia, protecting both Indigenous producers and consumers from fraud.
Oxalate Content: A Caution
One important caveat: Kakadu plum falls into the high-oxalate category. Oxalates are naturally occurring compounds found in many plant foods, but in high amounts they can interfere with calcium absorption and contribute to kidney stone formation in susceptible people. Research published in the journal Food Chemistry found that both the fruit and leaves contain substantial oxalate levels, enough to potentially elevate urinary oxalate in people who are prone to kidney stones. If you have a history of calcium oxalate kidney stones, it’s worth being cautious about regular or heavy consumption of Kakadu plum products.