Bilimbi Averrhoa bilimbi ; Oxalidaceae Also called cucumber tree or tree sorrel Biriba Rollinia deliciosa ; Annonaceae Bitter melon , the flesh of which is bitter, and used as a culinary vegetable, but with a sweet coating around the mature seeds Black apple Planchonella australis ; Sapotaceae Black cherry Prunus serotina ; Rosaceae Blackcurrant "Ribes nigrum" Black raspberry Rubus occidentalis or Rubus leucodermis ; Rosaceae Black mulberry Morus nigra ; Moraceae Black sapote Diospyros digyna Black walnut Juglans nigra ; Juglandaceae Blackberry , of which there are many species and hybrids, such as dewberry , boysenberry , olallieberry , and tayberry genus Rubus Blood orange Blue tongue Melastoma affine ; Melastomataceae Blueberry Vaccinium, sect.
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Studies involving humans are for the most part badly designed. A few quality studies have been carried out over the years, starting in 1998 with a double-blind, placebo-controlled trial of 135 adults over 12 weeks published in The Journal of the American Medical Association. They found no evidence that hydroxycitric acid, the active ingredient in weight loss products made from garcinia cambogia, produced significant weight loss.
The American Journal of Clinical Nutrition in 2004 published a systematic review of meta-analyses and clinical trials on dietary supplements for weight loss by complementary medicine researchers at the Universities of Exeter and Plymouth. None of the over-the-counter weight loss aids worked, including garcinia cambogia.