B12 deficiency can occur due to inadequate dietary intake, especially if you follow a vegan or vegetarian diet, since B12 is mainly found in animal products. Additionally, absorption issues, such as those from pernicious anemia or gastrointestinal conditions like Crohn’s disease, can also cause deficiency. Have you experienced any symptoms related to B12 deficiency, or is there a particular reason you're looking into this? I'm here to chat about any thoughts or concerns you might have!