First off, congratulations if you understood my pun. Folic acid or Folate is also known as vitamin B9. The name Folate derived from foliage refers to the common source of B9, green leafy vegetables. Folic acid is one of those vitamins that is really valued in the nutritional and medical worlds.
The one thing every nutritionist in the world will agree on is that people need to eat more green vegetables. In terms of the medical world, folic acid is a major nutrient required for healthy pregnancy (especially decreasing birth defects), lowering homocysteine, combatting depression, reducing risk for heart disease, stroke, cancer, and increasing reproductive health. In the functional medicine world, this list is much much longer.
That being said Folic Acid is generally regarded as a staple nutrient by all and incorporated in every major multi-vitamin, as well as being a very popular supplement on its own. Prenatal vitamins usually are recognized by their higher dosage of Folic Acid.