Hi,
No, I don't think you should give up either. I'd keep taking both for at least a couple weeks and see what happens. Furthermore, I think if you quit the fiber your stools will not be as bulky. Keep a steady routine for a little while and then adjust the doses as you go (if need be). If you get constipated you might want to consider cutting down on the calcium. Either way, whether you have D or C, fiber is good for you and probably shouldn't be cut out. Just my personal opinion... hopefully someone else will be along to add to this.
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