Is eating chicken eggshells to strengthen weak bones halal?

All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallahu ‘alayhi wa sallam, is His slave and Messenger. 

It is halaal to eat the chicken eggshell for any purpose because it is ritually pure and lawful for consumption. However, it is recommended to wash it first for hygienic purposes or given the possibility that the chicken was Jallaalah (fed on impure substances). The Maaliki scholar Al-Hattaab wrote, “It is enjoined to wash eggs before breaking them; but if the person does not wash them, then he bears no sin for that... It is because the bird may have been fed on impure substances and accordingly is Jallaalah (animals that feed on filth and dung) and the eggshells got contaminated with its urine, or merely because they may be unclean and repulsive...” [Mawaahib Al-Jaleel]

Allah knows best.