Vitamin B12

Use vitamin B12 supplementation when you’re vegan or vegetarian, since dietary intake is often insufficient. Oral B12 is usually effective, but people with autoimmune pernicious anemia or other absorption/transport problems may need high-dose B12 and sometimes additional B1 support. The goal is to prevent deficiency-related neurologic and blood issues by replacing a nutrient that’s otherwise hard to obtain from plant-based diets.