Some of the top food sources for vitamin B9 (daily need is 400 micrograms)

Some of the top food sources for vitamin B9, also known as folate (daily need is 400 micrograms):

lentils (1 cup cooked): 358 micrograms

pinto beans (1 cup cooked): 296 micrograms

asparagus (1 cup cooked): 268 micrograms

spinach (1 cup cooked): 263 micrograms

broccoli (1 cup cooked): 168 micrograms

avocado (whole, 201 grams): 163 micrograms

mango (whole, 336 grams): 145 micrograms

romaine lettuce (3 ounces): 116 micrograms

orange (whole, 121 grams): 47 micrograms

wheat bread (slice, 29 grams): 25 micrograms

More here. 

The only vitamin supplements that can do you any good are B6, B12, and folic acid (folate in foods)

So says the story here:

The only supplements that showed any benefit among the studies were folic acid or B-vitamins that contained B6, B12, and folic acid, which could lower one’s risk of heart disease and stroke. Folic acid alone showed a 20 percent lowered risk of stroke. Conversely, the review found that niacin and antioxidants had a “very small” effect that could potentially raise the risk of death from any cause.