African Dream Herb

In several African traditions the seed is used to induce vivid and meaningful dreams, sometimes as part of practices intended to communicate with the ancestors or the spirit world. Tobacco made from the seeds is reported to cause vivid dreaming ^{5Reference 5Nzowa et al. · 2013In vitroTwo new tryptophan derivatives from the seed kernels of Entada rheedei: effects on cell viability and HIV infectivity — in vitroView study →}.

The inner seed material is shredded and smoked, brewed as a tea, or eaten before sleep.

The hard seed shells are also worn as protective amulets.

Other reported medicinal uses of the plant include jaundice, diarrhoea, muscle and joint problems, and mumps ^{5Reference 5Nzowa et al. · 2013In vitroTwo new tryptophan derivatives from the seed kernels of Entada rheedei: effects on cell viability and HIV infectivity — in vitroView study →}.

In Thailand the seed kernels are taken for stomachache ^{4Reference 4Sugimoto et al. · 2012Medicinal plants of ThailandView study →}.

In a rural community in Mozambique the seeds, called zangusi, are a food. The kernels are put into the fire and then shelled, and they are sometimes used to make xima, a porridge ^{26Reference 26Bruschi et al. · 2014Traditional uses of plants in a rural community of Mozambique and possible links with Miombo degradation and harvesting sustainability — ethnobotanical surveyView study →}.

Entadamide A and entadamide B are sulfur-bearing thioamides first isolated from E. phaseoloides seeds; entadamide A is also present in E. rheedii ^{5Reference 5Nzowa et al. · 2013In vitroTwo new tryptophan derivatives from the seed kernels of Entada rheedei: effects on cell viability and HIV infectivity — in vitroView study →}. Both inhibited 5-lipoxygenase in cultured cells ^{1Reference 1Ikegami et al. · 1989In vitroSynthesis of entadamide A and entadamide B isolated from Entada phaseoloides and their inhibitory effects on 5-lipoxygenase — in vitroView study →}.

Saponins from E. phaseoloides stems, and their aglycone entagenic acid, suppressed nitric-oxide production in stimulated macrophages (IC50 about 20–25 µM) and reduced the release of TNF-α, IL-1β, IL-6 and IL-8 ^{10Reference 10Xiong et al. · 2015In vitroTriterpene saponins with anti-inflammatory activity from the stems of Entada phaseoloides — in vitroView study →}.

In arthritic rats, a topical E. phaseoloides seed ointment matched diclofenac ointment on day 12, and a seed paste was more effective than diclofenac by day 21 ^{9Reference 9Dawane et al. · 2011AnimalExperimental evaluation of anti-inflammatory effect of topical application of Entada phaseoloides seeds as paste and ointment — animal modelView study →}.

Phaseoloidin, from E. phaseoloides seed, suppressed gout inflammation in mice by blocking NLRP3 inflammasome activation and caspase-1-dependent IL-1β maturation ^{11Reference 11Jiang et al. · 2026AnimalPhaseoloidin, a homogentisic acid glucoside from Entada phaseoloides, suppresses gout inflammation via NLRP3 inflammasome — mouseView study →}. Entadamide A-β-D-glucopyranoside eased imiquimod-induced psoriasis in mice ^{12Reference 12Zhang et al. · 2026AnimalEntadamide A-β-D-glucopyranoside attenuates psoriatic dermatitis by restoring keratinocyte homeostasis and suppressing neutrophil extracellular traps — mouseView study →}.

Bark and leaf fractions of the West African tree E. africana inhibit iNOS and pro-inflammatory cytokines in microglia and skin cells ^{13,14Reference 13Owona et al. · 2013In vitroEntada africana fraction CH2Cl2/MeOH 5% inhibits inducible nitric oxide synthase and pro-inflammatory cytokine gene expression induced by lipopolysaccharide in microglia — in vitroView study →Reference 14Codo Toafode et al. · 2022In vitroAnti-inflammatory potential of phenolic compounds isolated from Entada africana Guill. & Perr. used in the Republic of Benin — in vitroView study →}.

Gap: No study tested E. rheedii itself for anti-inflammatory effect beyond a screening-level assay ^{8Reference 8Rawat et al. · 2024Nutritional characterization of an underutilized legume Entada rheedii Spreng. seeds and validation of its folklore usesView study →}, and none used an oral seed preparation.

Rheediinoside A and rheediinoside B, saponins isolated from the E. rheedii seed kernel, showed moderate antioxidant activity in vitro, with rheediinoside B the more active ^{2Reference 2Nzowa et al. · 2010In vitroRheediinosides A and B, two antiproliferative and antioxidant triterpene saponins from Entada rheedii — in vitroView study →}.

A 2024 nutritional study of E. rheedii seeds reported anti-radical activity ^{8Reference 8Rawat et al. · 2024Nutritional characterization of an underutilized legume Entada rheedii Spreng. seeds and validation of its folklore usesView study →}.

In mice under chronic restraint stress, an E. phaseoloides seed extract restored the antioxidant enzymes glutathione and superoxide dismutase and lowered lipid peroxidation in the hippocampus ^{23Reference 23Barua et al. · 2020AnimalEffect of seeds of Entada phaseoloides on chronic restraint stress in mice — animal modelView study →}.

The whole-animal evidence is in E. phaseoloides, whose seed is used for diabetes by the Dai people of China ^{15Reference 15Zheng et al. · 2012AnimalAntidiabetic effect of total saponins from Entada phaseoloides (L.) Merr. in type 2 diabetic rats — animal modelView study →}.

Total saponins from the seed, given orally at 25, 50 and 100 mg/kg for 21 days, lowered fasting blood glucose and serum insulin, improved blood lipids and reduced oxidative stress in type 2 diabetic rats. The effect was dose-dependent and comparable to metformin ^{15Reference 15Zheng et al. · 2012AnimalAntidiabetic effect of total saponins from Entada phaseoloides (L.) Merr. in type 2 diabetic rats — animal modelView study →}.

In liver cells, the total saponins suppressed glucose production by activating the AMPK pathway, raising phosphorylation of AMPK, ACC and Akt/GSK3β ^{16Reference 16Zheng et al. · 2016In vitroEntada phaseoloides extract suppresses hepatic gluconeogenesis via activation of the AMPK signaling pathway — in vitroView study →}.

A 2024 study of E. rheedii seeds also reported antidiabetic activity at a screening level ^{8Reference 8Rawat et al. · 2024Nutritional characterization of an underutilized legume Entada rheedii Spreng. seeds and validation of its folklore usesView study →}.

Gap: The dose-response data are for a different species. For E. rheedii there is only a screening signal, with no in-vivo glucose study and no human data.

In rats with arthritis of the knee, topical E. phaseoloides seed paste and ointment both raised pain thresholds, comparably to diclofenac ^{17Reference 17Dawane et al. · 2013AnimalAnti-nociceptive effect of Entada phaseoloides seeds formulation after topical application in arthritic Wistar rats — animal modelView study →}.

An ethanol leaf extract of E. africana reduced pain and inflammation in rodents ^{18Reference 18Ezenyi et al. · 2014AnimalAnalgesic, anti-inflammatory, and heme biomineralization inhibitory properties of Entada africana ethanol leaf extract — animal modelView study →}, and the traditional uses of E. phaseoloides seed include pain relief and fever ^{12Reference 12Zhang et al. · 2026AnimalEntadamide A-β-D-glucopyranoside attenuates psoriatic dermatitis by restoring keratinocyte homeostasis and suppressing neutrophil extracellular traps — mouseView study →}.

Gap: The pain data are topical, in a different species. No pain study exists for the dream herb.

The E. rheedii saponins rheediinoside A and B showed moderate antiproliferative activity against glioblastoma (T98G), epidermoid (A431), prostate (PC3) and melanoma (B16-F1) cell lines ^{2Reference 2Nzowa et al. · 2010In vitroRheediinosides A and B, two antiproliferative and antioxidant triterpene saponins from Entada rheedii — in vitroView study →}. A lactose-binding lectin, entadin, purified from the seed, induced apoptosis in lung (A549) and cervical (HeLa) cancer cells, with IC50 values of 28 and 32 µg/mL, and did not affect normal cells ^{20Reference 20Naik et al. · 2020In vitroBiochemical characterization of lactose-binding Entadin lectin from Entada rheedii seeds with cytotoxic activity against cancer cell lines — in vitroView study →}.

In E. phaseoloides, an n-butanol seed fraction induced apoptosis in HepG2 liver-cancer cells through mitochondrial depolarisation ^{19Reference 19Zhang et al. · 2014In vitroN-butanol fraction of Entada phaseoloides ethanol extract inhibits hepatocellular carcinoma HepG2 cell proliferation by inducing apoptosis — in vitroView study →}. Synthetic derivatives of entadamide A have been made that are active against breast-cancer cells and slowed tumour growth in mice ^{21Reference 21Bhulakshmi et al. · 2026In vitroDesign and synthesis of entadamide A derivatives targeting breast cancer: insights into in silico, in vitro and in vivo modelsView study →}.

A tannin extract of E. phaseoloides (76% tannin) sped wound closure in rats, promoted fibroblast growth and migration, and inhibited Staphylococcus aureus (MBC 1.5 mg/mL) ^{22Reference 22Su et al. · 2017AnimalWound-healing promoting effect of total tannins from Entada phaseoloides (L.) Merr. in rats — animal modelView study →}.

The authors attributed the wound-healing effect to both the antibacterial action and the effect on cell growth.

Gap: One study, one species, and a tannin fraction applied to wounds rather than the whole seed.

In mice under 28 days of daily restraint stress, a methanolic E. phaseoloides seed extract given at 100 or 200 mg/kg for the last seven days reduced immobility in the forced-swim test. It also restored antioxidant enzymes and lowered markers of endoplasmic-reticulum stress and cell death (GRP78, GRP94, CHOP, caspase-12) in the hippocampus. The authors judged its antidepressant response weak ^{23Reference 23Barua et al. · 2020AnimalEffect of seeds of Entada phaseoloides on chronic restraint stress in mice — animal modelView study →}.

Two tryptophan derivatives from E. rheedii seed, tryptorheedei A and B, appear to inhibit indoleamine 2,3-dioxygenase (IDO) in an HIV infection assay. IDO controls the kynurenine pathway, which is linked to serotonin and melatonin synthesis, and the authors proposed that this could explain the plant’s reported effects on the mind ^{5Reference 5Nzowa et al. · 2013In vitroTwo new tryptophan derivatives from the seed kernels of Entada rheedei: effects on cell viability and HIV infectivity — in vitroView study →}.

Gap: The behavioural data are in a different species, and the IDO link is a hypothesis from an HIV assay, not a brain or sleep study. The dream-enhancing effect itself has not been tested.

Toxicity. No human study, no animal toxicity test and no official monograph covers Entada rheedii. Two tryptophan derivatives from the seed were not toxic to human immune cells in the laboratory ^{5Reference 5Nzowa et al. · 2013In vitroTwo new tryptophan derivatives from the seed kernels of Entada rheedei: effects on cell viability and HIV infectivity — in vitroView study →}, which says little about eating the seed.

Saponins. The bark and seeds contain saponins ^{27Reference 27Wu et al. · 2010Entada rheedii Sprengel — species description, habitat and distribution — floraView study →}. Large amounts taken by mouth may irritate the gut, as saponins generally can.

Sedatives. The seed is used before sleep to bring on dreams, so take care combining it with sedatives or other drugs that depress the nervous system. No interaction has been measured.

Liver enzymes. Inhibition of the liver enzyme CYP2E1 has been shown for a bark extract of E. africana, a different West African species ^{25Reference 25Kouam et al. · 2025In vitroEnzyme kinetic and in silico characterization of cytochrome P450 2E1 inhibition by hydro-ethanolic extract of Entada africana and its protective role in acetaminophen-induced hepatotoxicity — in vitro / in silicoView study →}. No enzyme or drug-interaction study has been done on E. rheedii.