good levels. Mango peel  and pulp contain other  phytonutrients , such as the  pigment   antioxidants  - carotenoids and polyphenols - and  omega-3  and -6  polyunsaturated fatty acids . Guarana A 2007 human pilot study  assessed acute behavioral effects to four doses (37.5 mg, 75 mg, 150 mg and 300 mg) of guarana extract. Memory, alertness and