vitamin B-9 (Folic acid) 

what a time .. to be alive

clinical background

A Deeper Look: Severe folate deficiency has been linked to decreased brain functioning + increased levels of depression 

A Deeper Look: Folic Acid helps metabolize a bodily compound called - homocysteine into methionine, an essential amino acid, thus encouraging cardiovascular health. High levels of homocysteine have been linked to heart disease and stroke.