dl-methionine
DL-methionine is a sulfur amino acid supplement used to meet essential amino acid needs and often to acidify urine. Normal formulation levels are safe, but studies show excess methionine can cause methemoglobinemia and Heinz body hemolytic anemia in cats, and high-dose methionine supplements are not recommended for kittens.
Other common names: dl methionine, methionine, DL-メチオニン, 蛋氨酸, 甲硫胺酸, DL蛋氨酸
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Sources: ASPCA Animal Poison Control Center, FDA Center for Veterinary Medicine, veterinary literature.
For reference only, not medical advice. If poisoning is suspected, seek veterinary care immediately.