seems that vitamin D3 unleashes the power of calcium by coaxing one's system to maximum absorption, so when i looked at the highest dose and main ingredient of my pHion Alkalizing Minerals potion...you guessed it: it's calcium! 450 mg per serving to be precise. my plan is to be off Prilosec completely by next week (now i'm staggering it to every third day) and start on Zantac 150 twice daily. my goal is to get off ALL antacids, stay on 10,000 IUs of D3 daily and hopefully be able to ward off chronic heartburn episodes with a quasi-vegan diet. will keep you posted.