veggies 2A study conducted on rats, appearing in the journal Circulation (April 8, 2008; 117(14):1810-19), found that folic acid may protect from the damage of a heart attack. Rats were treated with 10 mg of folic acid (which is a massive dose for a rat) or a placebo. After one week, the researchers induced myocardial infarction. The rats that were supplemented with the folic acid had better cardiac function after the heart attack. There were also lower levels of damaging superoxide radicals and less muscle damage in the supplemented rats. Folic acid is found in green leafy vegetables.