Oral B12 vitamins rely on your stomachs acidity and intrinsic factor for absorption, which can be variableespecially if you have gut issues or take acid-blocking medications
It secretes collagen, which helps in wound closure at the site of injury
Most mass-market B12 supplements use cyanocobalamin, which is cheaper to manufacture but must be converted in the liver before it becomes metabolically active
This is conjectured to be a circulating storage function
For this, you should seek the help of a bariatric Doctor, who, after evaluating your case in depth, will advise you on the bariatric surgery you are a candidate for, and will design a post-surgery treatment plan adapted to your needs, helping you avoid a possible vitamin B12 deficiency