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If you could bottle the neurotransmitter serotonin, it would instantly be one of the top supplements: After all, it's not only responsible for carrying signals between your nerves - in the process, it helps boost your mood and emotional well-being, while curbing stress. In short, serotonin helps keep you satisfied - which is why some experts call it your brain's "Confidence Molecule." However, serotonin itself can't cross the blood-brain barrier - meaning that your brain must produce it from within. Fortunately, though - you can naturally support and enhance your brain's levels of serotonin indirectly by giving your system its direct amino acid precursor known as 5-Hydroxytryptophan (5-HTP for short). 5-HTP is what your body naturally makes from the amino acid tryptophan, and turning tryptophan into 5-HTP is your body's natural bottleneck in the production of serotonin. Supplementing with 5-HTP - which readily crosses the blood-brain-barrier - is the easiest way to organically support your levels of the mood-lifting neurotransmitter serotonin. Bulletproof combines natural plant-sourced 5-HTP with vitamin B-6 for optimal conversion to serotonin (one of the primary functions of B-6 is to assist in the synthesis of amino acids and neurotransmitters).