Amino acid transporter that plays an important role in the absorption of amino acids in the intestinal tract. Mediates the uptake of a broad range of neutral and cationic amino acids (with the exception of proline) in a Na(+)/Cl(-)-dependent manner (PubMed:10446133). Transports non-alpha-amino acids such as beta- alanine with low affinity, and has a higher affinity for dipolar and cationic amino acids such as leucine and lysine (PubMed:18599538). Can also transport carnitine, butirylcarnitine and propionylcarnitine coupled to the transmembrane gradients of Na(+) and Cl(-) (PubMed:17855766). {ECO:0000250|UniProtKB:Q9JMA9, ECO:0000269|PubMed:10446133, ECO:0000269|PubMed:17855766, ECO:0000269|PubMed:18599538}. This is the function of ENSG00000268104 (SLC6A14, solute carrier family 6 member 14).