Irvingia is a genus of African and Southeast Asian trees in the family Irvingiaceae, sometimes known by the common names wild mango, African mango, bush mango, dika or ogbono. They bear edible mango-like fruits, and are especially valued for their fat- and protein-rich nuts.
The fruit is a large drupe, with fibrous flesh. The subtly aromatic nuts are typically dried in the sun for preservation, and are sold whole or in powder form. They may be ground to a paste known variously as dika bread or Gabon chocolate. Their high content of mucilage enables them to be used as thickening agents for dishes such as ogbono soup. The nuts may also be pressed for vegetable oil.
The trees yield a hard wood, useful in construction.
- Irvingia gabonensis (Aubry-Lecomte ex O'Rorke) Baill.
IGOB131, aka WellTrim iG, is a patented I. gabonensis extract and is the only such extract that is clinically proven for weight loss. IGOB131/WellTrim iG was demonstrated in a small double-blind placebo-controlled study to result in greater weight loss and improved blood test results in obese human volunteers when compared with placebo. According to the study, which incorporated a IGOB131/WellTrim iG, a patented Irvingia extract, there were significant reductions in weight, waist circumference, hip circumference, and systolic blood pressure in subjects taking IGOB131 compared to the placebo. Despite overall weight loss in this study there was not a significant reduction in body fat percentage. This indicates that weight was lost from both adipose tissue and from lean body mass and that these losses were proportionate to original body compositions. A further, longer Irvingia clinical trial (also incorporating the patented IGOB131 extract) published in 2009 reported both weight loss and percent body fat loss. In another study published in 2008 patented IGOB131/WellTrim iG was demonstrated to enhance the weight reducing effects of Synetrim CQ, a patented Cissus quadrangularis extract. 
- Irvingia malayana Oliv. ex A. W. Benn.
- D. Gledhill. The Names of Plants. Cambridge University Press, 2008.
- Ngondi, Judith L; Oben, Julius E; Minka, Samuel R (2005). "The effect of Irvingia gabonensis on body weight and blood lipids of obese subjects in Cameroon". Lipids in Health and Disease 4: 12. doi:10.1186/1476-511X-4-12. PMC 1168905. PMID 15916709.
- Ngondi, Judith L; Etoundi, Blanche C; Nyangono, Christine B; Mbofung, Carl MF; Oben, Julius E (2009). "A novel seed extract of the West African plant Irvingia gabonensis, significantly reduces body weight and improves metabolic parameters in overweight humans in a randomized double-blind placebo controlled investigation". Lipids in Health and Disease 8: 7. doi:10.1186/1476-511X-8-7. PMC 2651880. PMID 19254366.
- Oben, Julius E; Ngondi, Judith L; Momo, Claudia N; Agbor, Gabriel A; Sobgui, Caroline (2008). "The use of Cissus quadrangularis and Irvingia gabonensis extract combination in the management of weight loss: A double-blind placebo-controlled study". Lipids in Health and Disease 7: 12. doi:10.1186/1476-511X-7-12. PMC 2330043. PMID 18377661.
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