I have a hen who is laying (pooping) shell-less eggs off the perch every night. This has been going on for three weeks. before that she had been very sick and lost half her body weight. I have been giving her oyster shell, crushed egg shell. milky porridge, yoghurt etc but she is not putting shell on the eggs. So I have been to the chemist and the only suitable calcium supplement is a soluble tablet. As well as1000mg calcium, the tablet also contains - aspartame, phenylalanine, and traces of sorbitol. Are any of these dangerous for poultry? Thanks for you help.