Methyl folate (aka 5-MTHF) is the purest form of Vitamin B9, playing a vital role in stable and healthy folate levels, which are essential to the body in energy production. Often used in supplements designed to boost energy levels, Methyl folate is also found in vegetables such as broccoli, asparagus, brussel sprouts and black eyed peas, as well as beef liver, avocado and citrus fruits.