Pete Podurgiel wrote:
Reference: https://pmc.ncbi.nlm.nih.gov/articles/PMC6097542/
Two authors without non-personal email addresses associated. Their evidence is 4 people and their case studies. They did not use double blind randomized comtrolled trials. They did not present on purification methods used by industry, since the introduction of A. Niger produced citric acid in 1919, over a hundred years ago. I haven't looked, but my guess is this also wasn't peer reviewed. The whole "unnatural" claim seems bogus and misdirectional, it's about the same as saying yogurt is unnatural or yeast leavened bread is unnatural.