I suggest you start with a good bariatric multivitamin, like Celebrate or Bariatric Advantage. Check out this thread comparing some different types of vitamins and you'll see what I mean - "regular" multivitamins don't really meet the needs of WLS patients.
Flintstones vs. Bariatric Vitamins
Then you'll need calcium, and it should be calcium citrate (as opposed to calcium carbonate).
Check with your doctor about what else you'll need. Most recommend B12 and iron.
I use this stuff called ENS from Celebrate. It's a drink mix. You mix it with 8 ounces of water and it tastes just like grape Koolaid. It's a multivitamin plus 500 mg of calcium. I used to use the chewable multis and calcium from Celebrate, but they were making me nauseous. I like this much better.
You use it twice a day, but that's only 1000 mg of calcium, and we need 1500 - 2000 mg of calcium a day. So I also use this stuff called Upcal D, which is 500 mg of calcium citrate plus some vitamin D. It's a powder and you can dump it in any drink. I usually add it to my protein shake.
I use the B12 patch. I used to use a sublingual, but I didn't like the taste. I really like the patch. I wish I could get all my vitamins that way, but apparently no one makes a multivitamin patch or a calcium patch (I looked).
Kelly