Well, multi vitamins are not going to have anything to do with digestion, except that they can be kinda hard to digest.My favorite all-time digestive capsule is Pioneer Digestive Enzymes because you can take it with food to prevent bad digestion (this is the case with all enzymes), but it also contains herbs that will clear up gas, bloating, grumbly-tummy, and all the other yucky symptoms of indigestion, after-the-fact: meaning you can take it once you already feel bad and it will help. Check at your local health food stores for the best substitutions:If you can't find that one, look for a substitute that contains a bunch of this stuff

roteaselipaselactaseamylasechymo-trypsinpancreatinbromelainand some of these...fenneldillpapayagingercumin***Also get yourself a probiotic, as suggested previously in this chain, since the beneficial bacteria in these complexes regulate the good bacteria vs bad bacteria competition in your gut, and they help you produce the enzymes that you otherwise have to take as a pill. Good brands: Jarrow EPS, New Chapter All-flora (needs refrig), Renew Life Florasmart, Nature's Way Probifia.****Lastly, if you notice blood or black in your feces, or are having chronic digestive pain, or chronic diarrhea, do not waste your time until you've seen a doctor and have been tested for h.pylori or other specific infections which need to be treated in a targeted manner, then start the enzymes & probiotics.Good luck

Its no fun.PS - If you know your blood type, and are really after the answer to your questions, there are really excellent recommendations in the book below (I've been watching people benefit from a lot of what is in this book(s) or 10+ years, because we sell it at my store)...and it was helpful to me, but don't forget to see your DR if you have serious or chronic issues.