Are all zwitterions pH neutral?

Zwitterions are mostly pH neutral. This is because of the presence of both positive and negative charges. The opposing charges in the same molecule balances each other out, resulting in the zwitterion becoming electrically neutral. Every zwitterion has an isoelectric point, which is the pH value at which the charge in the molecule is neutral. A zwitterion can acquire a positive or negative charge if an acid or base is added to the solution that contains a zwitterion.