Supplements like that, or any medication, won't give you a lasting happiness, I don't believe. You can't eat your happiness to feel it with truth. You will grow a tree of happiness in your head that won't produce any fruits of joy to fall from it, you'll "feel" without "feeling", if that is a good way to put it within the restrictions of our language. Concisely, the chemicals of the head will be present, but you won't feel it in your soul. Our souls are beacons of our emotions, emotions brought to us originally by our creation in God's image. I'm not sure how religious you are, of course, so this might all sound like mumbo-jumbo, but, basically, you have to fulfill yourself through action and soulful fulfillment instead of through plain inaction and that unavailing chemical fulfillment that only resides in the head. My belief is that soulful fulfillment is found through the belief in Christ's word which then puts into your soul the Holy Spirit, which, through its energy as that of the Perfect Creator's, therefore fulfills the soul with a clear sight of goodness no matter the face of hardship that stares at the soul in anger, tearing at it but, through the Spirit, having its claws pass through the believing soul with no effect, in fruitless attempts at deception. Our lives, and mortal living, is terrible in its form. Evil is not just within societies, but within each person, and so our reactions to present and visible evil from other souls can, through an absence of good, drive us towards further evils, like killing ourselves out of the challenge in mortal struggles. To escape this struggling life is to struggle for the immortal, instead, which leads us to the presence of good instead of its absence, as God's essence is goodness. To struggle for the immortal is to abide by the commandments of The Lord in all things, which are provided to us through the scriptures, through the words of Christ and those He guided through the Holy Spirit. To do this is, as King Solomon wrote in his own realization of this, "the whole duty of man", it is what provides us an ultimate purpose. I hope these words are of some value to you.
