In this preliminary study, data were collected with regard to the high concentration of cobalt in palm leaf and of vitamin B12 in the blood plasma of the elephant. This suggests microbial synthesis and absorption of vitamin B12 in the elephant intestine.
Ananthasubramaniam, C. R. (1980). A Note on the Nutritional Requirements of the Asian Elephant (Elephas maximus indicus). Elephant, 1(5), 72-73. Doi: 10.22237/elephant/1521731848