Brain Support Standardized Mucuna Extract Naturally Occurring 15% L-Dopa Non-GMO A Dietary Supplement Vegetarian/Vegan Kosher Botanicals/Herbs Family Owned Since 1968 GMP Qualified Assured Dopamine is a neurotransmitter that promotes enjoyment and interest in life. With 15% L-Dopa (the immediate precursor of dopamine), NOW Dopa Mucuna helps the body with what it needs to make this important neurotransmitter. Mucuna has been used in the traditional Ayurvedic system in India for thousands of years.