The following is from Andreas Kalcker's 2018 book Forbidden Health:
"Citric acid at 50% is definitely too much. Don't use it over 33% concentration, preferably lower. Besides, citric acid favors the growth of opportunistic bacteria called Citrobacter that feed on the remaining citrate after the reaction. I'm not saying that citric acid doesn't work. It merely is outdated and no longer the best choice. In high concentrations, it provokes undesirable side effects, while in low concentrations, its reaction is very slow."
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