Perhaps this is a childish question of a novice addict? Just kidding, not kidding, no time for jokes, with such a spread of drug addiction in Russia. All these hormones have long been synthesized, but even earlier, antidepressants and other psychotropic substances that force the body to use its resources. In medicine, of course, they use it, but skillfully, in hospitals for treatment.
The problem with happiness should not be sought in the biochemistry of the body or the use of external psychoactive substances, including beer, cigarettes and other legal drugs. These are, first of all, mental problems arising from the inability to live, and not knowing the truth.
In the first place I think there is an internal "emptiness" when a person has no goals, no aspirations, no positive desires. It depends on society and on the upbringing of parents, teachers, but above all on you. Then the person tries to fill this void with endorphins.
Others, who are wiser, extract them in a more harmless way - from within the body. People drink and prick more, both for "happiness" and for unhappiness, not being able to solve problems and difficulties encountered on their way. This is a big question and you essentially did not ask it in order to describe it in more detail.
But imagine a situation if a person constantly consumes these hormones of happiness. He no longer needs anything - it is to become his deity and idol. I neither want to work nor can I, nor even have children. The human body is so designed that it will require more and more doses until it destroys itself. (Maximum in ten years.)
What to do when everyone wants to be happy?
Seek the truth and the truth will make you free and happy - that's what Jesus Christ said. Whoever learns to live by it, to become a really happy person.
As mentioned above, endorphins are not really hormones and not really happiness. Then, they do not enter the brain through the tissue barrier. And finally, regular intravenous injections are very, very bad, look at the hands of an opiate addict.
The problem of unhappiness is solved by other methods. You go to a psychiatrist and there it is determined what drugs to prescribe you and whether to prescribe at all. Happiness as such can be triggered by antidepressants, euphoretics (psychostimulants like meta and caffeine, benzodiazepine tranquilizers, NDA antagonists), CNS depressants.
I think this is because over time, as a result of such injections, the human body will cease to produce endorphins on its own. And the era of sad people will come.
The popular notion that endorphins are "hormones of happiness" or "hormones of joy" is based on the fact that the introduction into the body of drugs similar to endorphins, in particular morphine and other opiates, leads to intense euphoria.
In fact, euphoria is caused by side effects on other neurotransmitters, in particular dopamine. In addition, there are other strong euoretics that are not related to endorphins, such as cocaine and MDMA, almost all of them are agonists of dopamine receptors.
PS Some people have learned to inject themselves "happiness" long ago, they are called drug addicts = )