A patient with pernicious anemia asks the nurse why oral vitamin B12 supplements are not effective. What is the best response?
1
"Your stomach does not produce enough intrinsic factor to absorb the vitamin B12."
2
"Oral vitamin B12 is too weak to correct your anemia."
3
"Vitamin B12 must be taken with iron to be absorbed."
4
"You need to take Vitamin C along with B12 for better absorption."