Comment by darth_avocado

One side effect of RO is vitamin B12 deficiency. And there is some debate around whether that is true or not, but anecdotally, I had developed a severe B12 deficiency to the point that one day out of the blue, I couldn’t move one of my legs. I freaked out and went to the ER, and it turns out, 1 B12 shot later, I went back to normal within minutes. The doctor hypothesized that I had developed a severe B12 deficiency because of RO water and that I supplement my food with B12 supplements. The regular intake of meat/eggs wasn’t sufficient to compensate for the lack of B12 absorption.