I do not think it is harmful to take Prilosec(omeprazole) 20mg daily or Protonix 40mg along with vitamin D3 1000 units daily especially if you have GERD or acid reflux problem;The report(the Abstract) said:
"Omeprazole (OPZ) and tamoxifen (TAM) strengthen the effects of anticancer drugs and dichloroacetate (DCA) inhibits tumor growth. This study assesses the synergistic effects of these drugs. "
But you donot need to take Tamoxxifen or DCA in order to do so.
They said OPZ and TAM " strengthen the effects of anticancer drugs" --;but unless your doctor tell you to do so; I will not take DCA and tamoxifen,
But Omeprazole does provide relief for acid reflux( I belief acid reflux and/or H.Pylori infection are the risk factors personally for CCA but they are NOT have been proven by the medical community yet.); I will also take vitamin D3 1000units daily since some of the clinical trial and research did provide some hint that it MAY works ( that means still not proven that it works.); but vitamin D3 is OTC medication and it is a vitamin; so I donot think it will be harmful to take them both.
I myself take both vitamin D3 1000units and Portonix40mg daily for about 6 months now.
Please know that my personal opinion is not intended nor implied to be a substitute for professional medical advice. If provided, information are for educational purposes.Consult doctor is a MUST for changing of treatment plans.