55 in addition, cystine is readily catabolized.52 The limitations of sulfur amino acid administration can be overcome by cysteine pro-drugs that are converted intracellularly to cysteine.

• 此外，胱氨酸在很短时间就被代谢掉(52)。含硫氨基酸补充剂的使用限制可以改用半胱氨酸替代药品加以克服，它可以在细胞内转换成半胱氨酸。