A very important study done by the Harvard University found that the coca leaf has a large amount of nutrients, more than other foods well known as strong ones:

FOODS USED FOR COMPARISON POURPOSES:

10 CEREALS
Amaranthus Caudatus, Oriza Sativa, Avena Sativa, Chenopodium Pallidicaule, Chenopodium Quinoa, Hordeum Vulgare, Sccale Cereale, Coix Lachrima Jobi, Zea Mays and Triticum Aesticum.

10 VEGETABLES:
Canna Edulis, Caapsicum spp., Allium Saticum, Arracacha Xanthorriza, Ipomoca Batatas, Cyclanthera Pedata, Cucurbita Maxima, Alliem Cepa; Brasica Oleracea and Tropacolum Tuberosum, and

10 FRUITS
Persea Americana, Ananas Cosmosus, Musa Sapientum, Cocos Nucifera, Passiflora Mollissima, Annona Cherimolia, Prunus Persica, Fregaria spp., Annona Muricata, and Ficus Carica.

MATE COCA is a medicinal tea made from the leaves of the Coca plant (Erythroxylon). This tea has been used for over four thousand years by the people of South America. Coca was and is still considered a sacred aspect of the Andean culture. It is only in this past century that the chemical configuration was changed to make the drug cocaine. Since then, the rest of the world has seen Coca as the raw material for the drug cocaine and not as the medicinal plant used for thousands of years. Coca was and is still used at every stage of the Andean peoples lives. Before giving birth, a woman drinks and chews Coca to hasten the labor and ease the pain. When a child is born, relatives celebrate by chewing the Coca leaf together. When a young man wants to marry a girl, he offers Coca to her father. And when somebody dies, Mate De Coca is drunk at the wake and a small pile of leaves are placed in the coffin before burial. From ancient times, these rituals were considered sacred, and as such, the Coca leaf continues to have a great significance in the culture of the Andean people

Andean People have used coca leaf as a remedy for thousands of years . Coca might be useful as a treatment for gastrointestinal ailments and motion sickness, as a fast-acting antidepressant medication, as a substitute stimulant for coffee in certain cases, and as an adjunct in programs of weight reduction and physical fitness. In leaf form, coca does not produce toxicity or dependence. Its effects are distinct from those of chloridrate of cocaine, which is but one of a number of active compounds in the leaf. Coca can be administered as a chewing gum containing a whole extract of the leaf, including alkaloids, natural flavors, and several nutrients, take a look the their contents.

About legal importation of coca leaf
Special to ABCNEWS.com