Is Kobalt [German, Polish] Safe in Breastfeeding

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

Gray powder or metal, odorless. There is a risk of asthma crisis if Kobalt [German, Polish] powder is inhaled. It can be a cause of skin, ocular and respiratory tract irritation. Acetate, sulfate, trioxide and nitrate Kobalt [German, Polish] salts are potentially carcinogenic. Mandatory measures to prevent inhalation (room air extraction and respiratory protection) and ingestion (avoid eating, drinking or smoking in the work place). The industry must ensure a Threshold Limit Value (TLV) (TWA as well) less than 0.05 mg/m3 (Kobalt [German, Polish] salts less than 0.002 mg/m3). Biological Exposition Index (BEI) on the last labor week day: 15 micrograms/L in the urine, 1 microgram/L in the blood. Benefits of breastfeeding are largely more important than risk related to the presence of mild level environment pollutants in human milk, in many instances, they are at lower content than those found in cow’s milk or other foods. (Codex alimentarius FAO-WHO).