Pì-su an-ki-sng (Eng-gí: essential amino acid) sī seng-bu̍t-thé bô hoat-tō͘ tùi-thâu ha̍p-sêng ê an-ki-sng, su-iàu keng-kòe chia̍h-mi̍h lâi khip-siu. Thù lâng lâi kóng, ū 9 khoán pì-su an-ki-sng, in sī phenylalanin, valin, threonin, tryptophan, methionin, leucin, isoleucin, lysine, kap histidin.

Lēng-gōa chāi jîn-thé koh ū 6 khoán an-ki-sng tī chi̍t koá chōng-khóng hā sī pì-su, pau-koat arginin, cystein, glycin, glutamin, prolin kap tyrosin

Bí-ji̍t che-liōng siu-kái

Si̍t-chè ta̍k-kang ê su-iàu che-liōng bô hó koat-tēng, kiàn-gī ê sò͘-jī mā tiāⁿ teh siu-kái. Í-hā sī WHO kiàn-gī ê tōa-lâng bí-ji̍t che-liōng:

an-ki-sng bí thé-tāng kong-kin ê su-iàu liōng (mg)
H Histidin 10
I Isoleucin 20
L Leucin 39
K Lysin 30
M Methionin

+ C Cystein

10.4 + 4.1 = 15
F Phenylalanin

+ Y Tyrosin

25 (total)
T Threonin 15
W Tryptophan 4
V Valin 26