Re: You cannot fix 'af' without fixing the source. Synthetic vitamins will not fix the source.
Inulin is one of many "prebiotic fibers." Prebiotics actually feed the good bacteria, whereas probiotics "install" the good bacteria. We need both for a really comprehensive gut program.
Making broth is super-simple. I've been doing it for the past 3 years.
First, you need some bones. The most commonly available bones are from beef: knuckle bones, marrow bones, meaty neck bones, and oxtails. You can also use chicken bones and chicken feet, or bones from any other animal.
Put the bones in a big pot, cover them with water, and pour in 1/2 cup of vinegar. (The vinegar helps draw out the minerals, and it will evaporate during cooking, so it won't affect the taste.) Wait for an hour.
Heat up the pot until it starts boiling. Depending on the kinds of bones you're using, some "scum" will rise to the top. This is mostly coagulated blood, so you take a spoon and skim the scum off. After there's no more scum rising to the top, cover the lid, reduce heat to a simmer/low boil, and that's it.
For beef bones, I usually cook for 24 hours, and chicken bones I cook for 4-6 hours.
When you're done, you strain the liquid and put it into jars. I usually make a few weeks' worth at a time, so I put some in the freezer.
Bone broth is great by itself or used as the foundation for soup.