These block iron absorption. Absorbing Folic Acid Eat good food sources of folic acid every day. Some good sources are asparagus, brussels sprouts, spinach, romaine lettuce, collard greens, and broccoli. Eat fresh, raw fruits and vegetables often. Don't overcook food.
Heat destroys folic acid.
Take the daily vitamin supplement your doctor suggests or prescribes. Don't drink alcohol. It interferes with absorption of folic acid. Some cereals also have vitamin B 12 added to them. The usual cause of a B 12 deficiency is not a lack of it in the diet but the inability to absorb it from food.