It's probably what's in the dairy (or what's being fed to the cow or the sheep or the goat). But because calcium is such a critical nutrient, here's a good source of calcium until you can find a type of dairy which agrees with you.
EGG SHELL RECIPE
How to Make Powdered Eggshells:
- Wash empty eggshells in warm water until all of the egg white is removed, but do not remove the membrane because it contains important nutrients for the joints which helps arthritis.
- Lay broken pieces out on paper towels and allow them to air dry thoroughly.
- Break the eggshells up into small pieces, and grind them to into a fine powder in a food processor, blender, coffee grinder, or a nut mill, or put them in a plastic bag and use a rolling pin to grind them. Please note that some blenders will not grind the eggshell into a fine enough powder. A coffee grinder works the best.
- Store powdered eggshells in a covered glass jar or container. Keep it in a dry place, like the kitchen cupboard.
How to take eggshell calcium (this forms calcium citrate) takes 3 hours:
- Put 1/2 teaspoon of powdered eggshell into a small dish (approximately 4 1/2 to 5 1/2 inches across) 1/2 teaspoon equals approximately 400 mgs of elemental calcium.
- Add the juice of 1/2 a lemon (freshly squeezed), and mix well it will start to bubble and foam, which is what is supposed to happen.
- Leave it at room temperature for 6 hours the longer you leave it the less gritty it will be, but do not leave it longer than 12 hours.
- It can be taken by the spoonfuls, followed by mouthfuls of water to wash it down. It is not sour tasting. In fact the taste is quite pleasant.