Excretion of gold into milk after gold sodium thiomalate has not been rigorously studied. Case reports indicate that gold appears in milk in small quantities and at least a little of it is absorbed because it is detectable in the infant's urine. No convincing cases of toxicity have been reported. Opinions of authors of review articles vary from recommending avoidance to allowing use.[1][2][3][4][5] Monitoring for possible adverse effects in the breastfed infant would seem prudent.