# What is prefix L for amino acids?

I know the "L" at the beginning of amino acids pointed out to show the substance is digestive.
The thing I don't know is that what is the "L" stands for and how it works.

• The stereochemistry at the chiral centre of each individual amino acid can be D or L or racemic. L is the naturally occuring form so most digestive enzyme are set up to metabolise polypeptides made of L amino acids. – Waylander Jul 16 '19 at 10:28
• Originating from right and left, though due to nomenclature stratification d and l labels do not always correspond to the actual verse, identified by (+) or minus instead. – Alchimista Jul 16 '19 at 10:45

• BTW, dextro is the root of the word dexterous, implying the person is skilled ("right" handed). Levo is a synonym for sinister, or left handed. – DrMoishe Pippik Jul 16 '19 at 23:48