Graviola by amazon Therapeutic Laboratories by Amazon Therapeutic Laboratories has been extracted from a famous tropical tree known for the luxurious growth and vibrant green fruit that tastes like lemon custard. The phyto-chemicals are derived from the leaf which is collected in the Amazon jungle and carefully shade-dried before extraction in their laboratory. Graviola, can support healthy cell growth and function. In addition, Graviola has been used for its whole body calming effects and as a supplement to help maintain a positive mood and good support circulatory system.