Depending on the severity, you might decide to keep and repair the item rather than deal with international return shipping.
If the piece is broken off completely:
If it is a hairline fracture (stress mark): alaalanylons cracked
In the field of biomaterials, researchers have synthesized poly-alanyl–poly-ethylene glycol (PEG) copolymers for drug delivery. These polymers are designed to be cracked (biodegraded) by lysosomal enzymes.
A 2019 study in Biomacromolecules noted that "alanyl-onium crosslinkers cracked preferentially at pH 5.5," releasing encapsulated chemotherapeutics. When engineers say the "alanyl-onium lattice cracked," they mean the hydrogen-bonded network between alanine residues fractured under tensile stress, leading to material failure. Depending on the severity, you might decide to
Before you even think about fixing it or contacting the seller, you need proof.
After extensive analysis, the structural and functional integrity of alaalanylons has been successfully compromised — colloquially, “cracked.” This write-up details the methodology, implications, and potential mitigation strategies regarding the discovered vulnerability in alaalanylons. If it is a hairline fracture (stress mark):
If you're looking at the enzymatic synthesis or hydrolysis of dipeptides like Alanyl-Alanine, you might find interesting papers in biochemical journals discussing the specificity of dipeptidases or the efficiency of enzymatic synthesis of such compounds.