Lysine (siok-siá: Lys / K),是 (sī)一 (chi̍t)種 (chióng)氨基酸 (an-ki-sng), R group有 (ū)極性 (ke̍k-sèng),帶 (toà)正 (chiàⁿ)電 (tiān)。人體 (Jîn-thé)無法就 (bô-hoat-tō)家己 (ka-tī)合成 (ha̍p-sêng)這 (chit)款 (khoán)氨基酸。