A member asked:

I'm a pt & have been informed/taught that we have 8 amino acids. i googled about it & found that there are a possible 9. are there 8 or 9?

A doctor has provided 1 answer
Dr. Roy Arnold answered

Specializes in Internal Medicine

Nine: The nine essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. Essential means that the body cannot manufacture these amino acids from others in the diet. Thanks for trusting HealthTap!

Answered 12/30/2014

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