Very useful info! And thanks for correcting me on the Tums thing. I think I’ll save this page so I have it for future reference.Tums is calcium carbonate. Calcium carbonate is fine to use, but the calcium citrate is more easily absorbed. Calf rate is a brand name of calcium citrate. Reading labels helps. Aim for around 600 mg of calcium daily for a 4-6 pound hen and above. A bantam would get about 200 mg. The vitamin D is helpful in the tablets. I would not worry about dyes and flavors in the Tums since they are good for humans. For a hen laying shell-less eggs I would treat for a week. For an egg bound chicken, I would give it once a day until she lays. Same for a prolapsed vent, until it goes inside.