Selenium status of lactating women is affected by the form of selenium consumed.

@article{McGuire1993SeleniumSO,
  title={Selenium status of lactating women is affected by the form of selenium consumed.},
  author={Michelle K. McGuire and S L Burgert and John A. Milner and L Glass and Rafael Kummer and R H Deering and Robert J. Boucek and Mary Frances Picciano},
  journal={The American journal of clinical nutrition},
  year={1993},
  volume={58 5},
  pages={
          649-52
        }
}
The impact of providing selenomethionine (2.7 mumol Se) or selenium-enriched yeast (2.9 mumol Se) on the selenium status of lactating and nonlactating women with customary intakes of approximately 1.3 mumol Se/d was studied. Plasma selenium declined in unsupplemented lactating women but not in nonlactating women. Selenomethionine increased plasma selenium in both lactating and nonlactating women whereas selenium-enriched yeast increased plasma selenium only in nonlactating women. Erythrocyte… 

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