There is an association between too much calcium in the diet and the
development of prostate cancer.   Also, there is an association with
more aggressive prostate cancers.   Several nutritional studies seem to
have shown that. From what I've seen, the association is air tight, but
I think anyone who has or has had prostate cancer would be prudent not
to take calcium supplements or to include too much calcium in his diet.
  On the other hand, too little calcium can also lead to health
problems,  so it is a matter of balance.   In addition, those on hormone
suppressing therapy may end up with osteoporosis and may need calcium
supplements for that.   That would be the greater risk to that of
encouraging the cancer from the calcium, which as I said is uncertain at
best.   According the Walsh's book, calcium may interfere with Vitamin D
metabolism and that may be what the problem is.   He suggests that one
may be able to counteract the effect by eating plenty of fruit.   That
is probably a good idea anyway, so even if it doesn't help the cancer,
it can't hurt.

I thought that glucosamine had been shown to help with arthritis and has
few side effects, but that the helpful effect of condroitin was
questionable and it does have side effects.   It might be prudent to
switch to just using glucosamine.  I've tried to get my wife to use it
for her arthritis, and she says it does help, but it also upsets her
digestion, so she hasn't been using it.   If anyone knows some way to
deal with that side effect of glucosamine,  let me know.