Serotonin is the hormone what makes us happy, so why aren’t we just injecting it into our body/taking it as tablets to get out of misery on command?
In: Biology
Your brain is surrounded by a barrier that is very selective about what can pass through it. Serotonin is manufactured by your body inside this barrier. Injecting or ingesting sarotonin won’t do anything because it cannot cross that barrier.
However, the chemicals from which serotonin is manufactured (such as tryptophan) *can* pass through that barrier and, indeed, you can purchase purified tryptophan for this purpose. But, as with most things, it has side effects.
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