Twenty amino acids build every protein in you, and you need all twenty. Essential does not mean more important — it means your cells have no pathway to construct the carbon skeleton, so it has to arrive in food already made. Nine are like that. Six more can normally be built, but only from a precursor you must eat, or only when demand is ordinary. Sort them yourself below.
The twenty, alphabetically
PVT TIM HaLL — the classic memory hook for the nine essentials: Phenylalanine, Valine, Threonine, Tryptophan, Isoleucine, Methionine, Histidine, Leucine, Lysine. strong evidence The list has been stable for decades; histidine was the last to be confirmed for adults.
Essential or not?twenty amino acids — sort every one
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Sorted0/20
Correct0
Streak0
ESSENTIAL 9CONDITIONAL 6NONESSENTIAL 5
Tap any amino acid to see how the body obtains it and what it is used for.
Body weight70kg· 154 lb
Tap any bar on the chart to read about that amino acid.