My experience with low acid causing GERD was to take Betaine HCL 
500mgs.Starting with 1 cap. 15 minutes B4 first meal, next meal take 2 caps 15 
min B4,next meal 3 B4, keep doing this until a burning peppery feeling is 
reached,then back off 1 cap.I had to reach 7 B4 I got this feeling.This 
protocol was followed until the peppery burn was experienced with less and less 
number of capsules.Now I very rarely have to take one.AND this along with a 
radical change of diet put a welcome end to GERD,and H-Pylori, the Ulcer 
causing Bacteria.

Harold