Calcarea phosphorica is the Latin name for calcium phosphate. It is used to make homoeopathic products. Its chemical formula is Ca3(PO4)2
Homoeopathic products are known for their often ridiculously high dilutions in either alcohol or water, but calcium phosphate is not diluted in this way. It is “triturated”. In homoeospeak, this means that it is finely ground with a mortar and pestle and mixed with lactose. One part of calcium phosphate is added to 99 parts of lactose, resulting in a 1C potency. One part of this mixture is then added to 99 parts of lactose, resulting in a 2C potency and so on.
Instead of one in part in one hundred, smaller steps can be used, such as one part in ten. In this case, the homoeopathic potency is indicated by the letter X. One part in 10 = 1X, one part in one hundred = 2X, one part in one thousand = 1,000 and so on.
From this follows that 2X = 1C, 4X = 2C and so on. However, homoeopaths will not make such comparisons, because the X versions undergo more processing and are therefore more “powerful”.
It is important to note that, in the more than 200 years of its existence, homoeopathy has never been able to demonstrate that it actually works. It is nothing more than an elaborate and expensive placebo.