What has changed is access
[2] Mild deficiencies may have few or absent symptoms
So, in short, despite what fbirder says, yes, vitamin B12 use in the body IS indirectly dependent on iron, as it is on potassium, magnesium and all the other minerals, and folate, vitamin D and all the other vitamins
pylori infection, or IBS You have had a gastric bypass or other surgeries affecting digestion You donate blood regularly You have chronic inflammation (which can block iron absorption) You take long-term acid-suppressing medication (PPIs or H2 blockers), which reduces iron absorption You are an endurance athlete both training and footstrike hemolysis deplete iron The good news
However, when used as part of a wellness or weight loss program, they may be considered elective and require out-of-pocket payment