Is your doctor telling you that you need supplements since you had gastric bypass?
Can your stomach not take a green smoothie with any of these high calcium vegetarian foods? Bok choy, turnip greens, watercress, mustard greens, collard greens, kale chickory greens, dandelion, escarole, dark lettuces, fennel, carob, oranges, tangerines, papayas, currants and figs.
Invest in a good blender like the Vitamix or Blendtec.