Long-term use is linked to low Vitamin B12; the article reports a review finding a 42% higher risk of deficiency. The Topvitamine article covers Proton Pump Inhibitors, medicines that lower stomach acid. It summarizes studies comparing users with people not taking these medicines. The main concern is whether long-term use affects Vitamin B12, especially over several years. The article describes a 2019 review that combined findings from several countries. That review reported the 42% higher risk. This means a higher risk compared with non-users—not that 42% of users became deficient. It also reports a 2017 study showing a 65% higher risk over five years. Longer use was linked to greater risk. In another study described in the article, people were aged 50 or older. About 12% of those taking the medicines for over two years had deficiency. That compared with about 4% of non-users. These are reported links, not proof that the medicines caused low levels. The article itself notes that the evidence is not uniform. Its figures come from different studies, so they are not interchangeable. They also cannot predict what will happen to one person's blood results. For BioSocial members, the useful takeaway is to put numbers alongside a timeline. Bloodwork dates and length of medicine use can add context to personal trends. Comparing those details with community peers may make shared results more useful. Stable numbers are worth sharing, too—not just drops. What changes, if any, have you seen in your Vitamin B12 results over time while using these medicines?