I have not yet found direct experimental data or theoretical studies on this problem. However, I found a series of very elegant works that may be useful for solving it. They can be found, for example, at
It can be assumed that nonstoichiometric zones of different nature can serve as sources of oscillations that transform the main stoichiometric mass of the crystalline material into a time crystal and thereby induce the generation of coherent radiation in accordance with the mechanisms described in the following articles:
1. Lyubarov M. et al. Amplified emission and lasing in photonic time crystals //Science377,425–428(2022) https://www.science.org/doi/epdf/10.1126/science.abo3324
2. Li H. et al. Stationary Charge Radiation in Anisotropic Photonic Time Crystals // Phys. Rev. Lett. 130, 093803 – Published 3 March 2023.- https://doi.org/10.1103/PhysRevLett.130.093803
This, in particular, may be the real physical mechanism of lithotherapy.