Product Description: Highest Effectiveness Active Form 15mg Supplement Ultra High Purity Pro Base Nutrition 5-MTHF plays a key role in the methylation cycle, which is essential for numerous biochemical processes, including the regulation of gene expression, protein function, and neurotransmitter production. Adequate levels of 5-MTHF are essential for the synthesis of neurotransmitters such as serotonin, dopamine, and norepinephrine.