Essential but lacking data (trace elements)

Question 1

what are the trace elements that are believed to be essential but lacking data?

Answer 1

nickel and vanadium

Question 2

whats the function of nickel?

Answer 2

iron metabolism

Question 3

whats the upper limit of nickel?

Answer 3

1 mg

Question 4

what are the two functions of vanadium?

Answer 4

phosphate enzyme, nitrogen fixing

Question 5

whats the upper limit for vanadium?

Answer 5

1.8 mg