Katemfe (Thaumatococcus daniellii) is a low-growing tropical plant native to the rainforests of West Africa. The plant produces small, pale purple fruit, each containing one to three hard, black seeds surrounded by a translucent, gel-like aril. This aril contains thaumatin, a protein that is roughly 2,000 times sweeter than sucrose by weight, making it one of the most intensely sweet natural compounds ever identified.
The fruit itself has been used as a sweetener and flavour enhancer in West African communities for centuries. The leaves of the plant are also used traditionally for wrapping food. Thaumatin extracted from katemfe has been approved as a food additive in many countries (including Australia, where it appears as E957) and is used in small quantities to enhance sweetness and mask bitterness in processed foods, chewing gum, and beverages.
Despite its remarkable properties, katemfe remains a niche ingredient globally, largely because the plant is difficult to cultivate outside its native tropical forest habitat.
How it's produced
Katemfe fruit is almost exclusively wild-harvested from plants growing in the understory of tropical rainforests in West Africa, primarily in countries such as Ghana, Nigeria, Côte d’Ivoire, and the Democratic Republic of Congo. The plant thrives in deep shade and humid conditions that are difficult to replicate in plantation settings.
Harvesters collect the small fruits from the forest floor or directly from the plants. The arils are carefully separated from the seeds by hand — the quantities are small, as each fruit produces only a tiny amount of the sweet material. For commercial thaumatin production, the arils are processed and the protein is extracted and purified. This extraction is labour-intensive and the raw material supply is limited, which contributes to thaumatin’s high cost relative to other sweeteners.
What it costs the planet (per kilo)
≈ Estimated from its category — typical for sugar, not measured for this item yet. Sources & methods →
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