I take a vitamin supplement daily (I get it on prescription).
The sleeve doesn't wear out as such. However, it will stretch over time. Hopefully though, by the time that starts to happen you will have changed your lifestyle enough to eat 'sensibly'.
The part of the stomach that is left, is the part that is less stretchy (apparently).
I've just copied the following from a site that I looked at when I was researching -
Some people are under the mistaken impression that any type of surgery to correct obesity will simply take care of the problem without any effort on their behalf. This is definitely not true of gastric sleeve resection. Dietary limitations have to be imposed and people who have the surgery are usually counseled on what they should eat and should avoid. Furthermore, as a person recovers from gastric sleeve resection, and begins to lose excess weight, exercise can help accelerate this process and is encouraged.
xx