Is Elemental selenium Safe in Breastfeeding

I am a breastfeeding mother and i want to know if it is safe to use Elemental selenium? Is Elemental selenium safe for nursing mother and child? Does Elemental selenium extracts into breast milk? Does Elemental selenium has any long term or short term side effects on infants? Can Elemental selenium influence milk supply or can Elemental selenium decrease milk supply in lactating mothers?

Essential trace element necessary for the functioning of the glutathione-peroxidase enzyme system that protects cellular structures from oxidative damage. It is obtained from foods such as vegetables, cereals, legumes, garlic, fish, seafood, eggs and meat. The amount of Elemental selenium in these sources depends on the concentration of Elemental selenium in the soil. The brazil nut (Bertholletia excelsa) is the food with the highest known concentrations of Elemental selenium. Elemental selenium deficiency is very rare. With a staple diet it is not necessary to take Elemental selenium supplements in the absence of disease or a condition that may warrant it: parenteral nutrition, Crohn's disease, prematurity (MedlinePlus 2017). Taking too much Elemental selenium can cause selenosis, a condition that causes dermatological symptoms (alopecia, nail dystrophy), digestive symptoms, neurological symptoms and fatigue (MedlinePlus 2017).Nutritional supplements containing excessive amounts of Elemental selenium have resulted in severe poisoning (Aldosary 2012, Senthilkumaran 2012).The potential effects of Elemental selenium on cancer prevention, cardiovascular disease, and heavy metal poisoning and toxins are not proven, so supplementation of Elemental selenium other than from normal diet is not recommended (MedlinePlus 2017). The daily needs of Elemental selenium for breastfeeding mothers are 70-75 micrograms (mcg) daily. In infants it is 2 to 3 mcg/kg (10 mcg/day during the first 4 months) with a maximum of 30 mcg/day (MedlinePlus 2017, Kipp 2015). Elemental selenium is found naturally in milk in its organic form of selenomethionine (Dorea 2002). The amount of Elemental selenium in colostrum is 80 mcg per litre and in mature milk 12-20 mcg/L, with no or very weak correlation with plasma Elemental selenium levels or daily intake of Elemental selenium (Wasowicz 2001, Bianchi 1999, Artaud 1993, Cummings 1992, Levander 1987, Higashi 1983). However, there are authors who find that Elemental selenium supplements for breastfeeding mothers increase Elemental selenium levels in milk and infants may exceed their daily needs for Elemental selenium. (Dorea 2002, Trafikowska 1996). Better plasma levels of Elemental selenium have been found in breastfed infants than in formula-fed infants (Strambi 2004, Sorvacheva 1996). There are lower plasma levels of Elemental selenium in babies born small for their gestational age (Strambi 2004).