Your Folate Supplement Can Hide a Different Deficiency

The warning is not ours. The NIH Office of Dietary Supplements states that taking large amounts of folate supplements might hide a vitamin B12 deficiency, because the folate corrects the anaemia that the B12 shortfall causes but not the nerve damage it also causes.

That second half is the part people miss. ODS says an untreated B12 deficiency can lead to permanent damage of the brain, spinal cord and nerves.

So the blood count looks better while the real problem keeps going. That is the whole reason step three exists, and it is a test, not a guess.

In the United States, folic acid is added to enriched bread, pasta, rice and flour. It is in most breakfast cereals, and it is in your multivitamin. All of that counts toward the same daily limit as the folate pill.

ODS puts it plainly: you should not consume folate in supplements or fortified foods and beverages above the upper limit unless a health care provider recommends it. ODS also notes that high doses of folic acid might raise the risk of colorectal cancer, and possibly other cancers, in some people.

Folate from beans, lentils and greens is different. Food folate does not count against that ceiling, which is one more reason the food answer is the easy one.

Less than the marketing suggests. MedlinePlus describes folic acid as the man made form of folate found in supplements and added to fortified foods, and folate as the form that occurs in food. Either way, what you are counting is the amount going in.

Quality is a separate question from form, and the ODS consumer guide answers it. The FDA does not check whether a supplement works before it goes on sale. Outside seals from groups such as NSF, USP and ConsumerLab confirm a product was made well and holds what the label says, but a seal does not promise the product is safe or that it works.

So read the amount per serving, add it to everything else you take, and pick a bottle that prints its number where you can see it.