Yes, aspartic acid isn’t directly added to Coca-Cola Zero, but it’s tied to the aspartame they use as a sweetener. Aspartame’s a combo of two amino acids—aspartic acid and phenylalanine—linked up with a bit of methanol.
When you drink Coca-Cola Zero, your body breaks aspartame down into those parts, so you’re getting aspartic acid indirectly. It’s not listed as an ingredient because it’s not dumped in raw; it’s just a byproduct of how aspartame works.
Coca-Cola Zero’s label lists aspartame alongside stuff like carbonated water, caramel color, and phosphoric acid—pretty standard for a zero-sugar soda. Aspartame’s about 200 times sweeter than sugar, so they only need a tiny amount to nail that taste, and it’s been greenlit as safe by health folks globally, barring rare cases like phenylketonuria (PKU). Point is, aspartic acid’s in the mix via aspartame’s breakdown, not as a standalone player.