If I'm drinking Unjury protein shakes for two meals so I need vitamin suppliments?

I'm pre-op and I will be starting on Unjury protein shakes this Friday to help me lose some required weight for surgery. I will be drinking them as two of my meal replacements. Do I also need to start taking vitamins? If so which do you recommend? Also can anyone offer information for drinking the shakes...what to mix them with? Also any suggestions for the meal that I will be eating for dinner?

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