Serving size of 3oz (85g) chicken liver has 1.680mg vitamin B2, which is 105% of the daily vitamin B2 RDA for lactating women. 1 liver (20g) has 24% of the daily vitamin RDA.
Serving of 3oz (85g) of chicken liver is also a good source of other priority 1 nutrient for lactating women, such as vitamin B12 and “true” vitamin A (retinol).
Find a recipe with chicken liver here