Methionine

Methionine is a sulfur containing amino acid that is important in a wide variety of metabolic processes. Supplemental DL-methionine has been used to help acidify the urine in cats prone to struvite urinary stones.

However, there are questions regarding the safety of the synthetic form (Internet search: safety of DL-Methionine) and Wysong has reformulated to boost methionine with high methionine-containing sesame seeds. For a source of supplemental DL-methionine, see Biotic pH-™.