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That said, these claims lack reliable research backing, with only a limited number of animal studies available

Cysteine degradation and energy metabolism Although the role of cysteine degradation in cancer development has predominantly been explored regarding H 2 S production, the usefulness of cysteine as a carbon source is also evident along its catabolic pathways, as its degradation gives rise to other organic compounds relevant for carbon and energy metabolism (Fig

The two main sources are supplements and selenium-rich foods

It has also been shown to suppress HER-2/neu gene expression, linked to breast cancer progression

Liposomal encapsulation also protects the active glutathione from degradation and ensures its is well tolerated in the stomach

The researchers therefore urge caution for patients with melanoma when taking any antioxidant supplements that could contain larger doses than recommended by health organisations