To answer Ocean's question, I have a hiatus hernia and very low stomach acid (no burps at all on the bicarbonate test). I tried betaine HCI and it set my oesophagus on fire for about 6 hours. It was sheer hell. Also I have read (and I would bet about 90 percent - though my memory is not great - that it was on Dr. Myhill's website), that lemon juice is much better than vineagar because too many CFS folks have problems with the yeast in vineagar. BTW CJB, that is a very good point about acid harming the teeth. Definitely something we should be careful of. I've been looking in my nutrition book (as I do tend to do in idle moments) and low stomach acid can be associated with deficiencies in quite a few different nutrients - Iron for example. Rich, is there anything we could do to test if that is relevant to us? Do you think it's worth getting blood tests for these deficiencies?