Jatropha curcas L.

Euphorbiaceae
Physic nut, Purging nut

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1. COMPARISON OF BIOENERGY  WITH OTHER Renewable Energy

Ale vera juices are commonly made from grounded leaves dissolved in water. They are packed and sold as health tonic. However three of the species including Aloe vera are not safe to drink and even banned by law in Japan.
However one can drink Aloe arborescence juices provided they are made hygenically and properly.

Juices made from leaves of three Aloe species Aloe vera , Aloe ferox and Aloe africana are not allowed to be used as food according to pharmaceutical affairs law in Japan while Aloe arborescens can be used as food. Thus its not safe to use Aloe vera juices as drink.
see also
Gullerman and Chauser Volfson 2008, (Bhansali and Kumar 2009 in press)

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It is strange analogy that since times immemorial Kattha was used along with Piper betle leaves by dance artists and visitors to the brothels, and rulers before indulgence. Were they knowing that consumption of Piper betle leaves with Acacia catechu can prevent them from AIDS or STD ? Its a matter of research .