It has lead, very high lead. Even ARL advices against usage of ACV for that reason. Malic acid should be used instead.
Endotoxin which everyone is talking about is acetaldehyde. The yeast that you were talkinga bout , candida produces tons of ethanol which then gets stuck in acetaldehyde stage. Acetaldehyde causes histamine release since it shares the pathway with it. that is why I don't like to give any acetic acid also. Since it will stop acetaldehyde to acetic acid conversion.
To convert ethanol you need zinc, cysteine, NAD and histidine. To get rid of acetaldehyde, you need ALDH, and AO enzyme. which is NAD , cysteine, histidine, b2 and molybdenum
You see again we have zinc finger here and MT structure .
This is why if someone lets say has UC and produces tons of acetaldehyde. then he should stay away from it.
By the way acetaldehyde air levels in major cities are 20 times higher than norm. So this is the stimulation of your ROS that you were taking about. I have done a lot of research on it.
I think this is the culpit of major problems these days.
And this is the reason of constant unexplained inflammation in the body.