Vitamin Overdose

Question 1

Vitamin A (retinol)

Answer 1

hypervitaminosis A

Question 2

Vitamin B1 (thiamine)

Answer 2

drowsiness

muscle relaxation

(Note: Upper RDA limit has not been determined in USA)

Question 3

Vitamin B2 (riboflavin)

Answer 3

none proven

Note: Upper RDA limit has not been determined in USA

Question 4

Vitamin B3 (niacin)

Answer 4

liver damage (<2g/day)

Question 5

Vitamin B5 (pantothenic acid)

Answer 5

diarrhea

nausea

heartburn

(Note: Upper RDA limit has not been determined in USA)

Question 6

Vitamin B6 (pyridoxine)

Answer 6

impairment of proprioception

nerve damage (>100mg/day)

Question 7

Vitamin B7 (biotin)

Answer 7

none proven

Note: Upper RDA limit has not been determined in USA

Question 8

Vitamin B9 (folate)

Answer 8

may mask symptoms of Vitamin B12 deficiency

Question 9

Vitamin B12 (cobalamin)

Answer 9

none proven

Note: Upper RDA limit has not been determined in USA

Question 10

Vitamin C (ascorbic acid)

Answer 10

none proven

Note: Upper RDA limit has not been determined in UK; RDA UL for USA is 2000mg/day

Question 11

Vitamin D (calciferol)

Answer 11

hypervitaminosis D

Question 12

Vitamin E (tocopherol)

Answer 12

increased risk of CHF

Question 13

Vitamin K (quinones)

Answer 13

decreased anticoagulation (effect of warfarin)

Note: Upper RDA limit has not been determined in USA