And this is a prime example of why 140 characters are not enough to provide nutrition counselling. It does appear that lower doses of vitamin A (such as the quantities you might obtain from eating the foods listed above) may increase absorption of non-heme iron (i.e. plant sources of iron). However, the increase seems to be minimal in comparison to consuming an iron supplement alone. In addition, when vitamin A supplements of 1, 800 µg were consumed with iron supplements they actually deceased iron absorption (1). Vitamin C, however, has been proven to increase iron absorption (2).
1. Do your own research. It’s difficult for a 140 character tweet to convey sufficient information for you to make an informed dietary decision.
2. Try to get most of your nutrients from food, rather than supplements. While consuming foods that contain vitamin A may aid in iron absorption, consuming vitamin A supplements may actually decrease iron absorption.