Quercetin While Breastfeeding. Her serum prolactin level was 27.3 mcg/l (normal 2 to 30 mcg/l) and decreased to 8.5. If you are pregnant or breastfeeding, do not take quercetin as a supplement.

However, there are no scientific studies to support the safety of quercetin supplements for breastfeeding or pregnant women. During fetal development, quercetin exposure had no effect on the erythroid lineage switch and concomitant globin switch. Q was shown to be a component of human milk at the nmol/l level.