I also seem to recall that someone did a "controlled" study some years back with alterna and found that Ca supplements helped improve fertility if given to males. The summary was that sperm were otherwise less motile if Ca was lacking or inadiquate.

I've often wondered what kind of mineral supliment wild animals, particularly those from arid areas, get from ingesting some surface grit along with their prey. Certainly more than from pine shaving dust!

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