Welcome to the forum!!!
A basic mutlivitamin does not contain what you truly need pre-op or normally, as the recommended daily allowance is not what the body really requires (especially prior to surgery). Almost all US RDA are lower than what one should have for daily intake. There are also several other factors at hand including sex of the individual, what your diet consists of (best way to get vitamins and minerals), are you on any medications, and what has your doctor specifically recommended. The last variable is most important. If you want to PM me, I can tell you where to obtain the vitamins you require. Please make sure you know exactly waht your surgeon specifies.