The acid which mayonnaise has in it comes mostly from the vinegar and lemon juice which are put in it as additives so that the mayonnaise does not spoil easily. Those who have problems with acid reflux will most likely want to avoid eating too much mayonnaise because of the fact that it usually has these additives in it, although there isn’t a lot of them.
If you find that you have problems with your acid reflux just after eating mayonnaise, it might be a good idea to avoid eating it on a regular basis so you do not aggravate your condition even more.