Johnny Vegas
I haven't found any good sources giving details of how to increase stomach acid. Indeed many sources say that it is impossible.
It is possible to increase stomach acid - but by how much I can't say.
HCL (hydrochloric acid) capsules are the obvious answer.
There are also indirect ways such as by taking the amino acid taurine.
Finally vinegar or lemon-juice taken before meals are supposed to acidify the stomach.
JV.