What kind of substances can the human body produce when in love?

Dopamine (C6H3 (OH) 2-CH2-CH2-NH2) is secreted by the brain and can affect a person's mood. Dopamine is a neurotransmitter, a chemical used to help cells transmit pulses. This kind of brain endocrine is mainly responsible for the lust of the brain.

The thalamus, the center of the brain, is the center of human love, which stores Cupid's Arrow, a variety of neurotransmitters, also known as love stimulants, including dopamine and adrenaline. When a man and a woman fall in love at first sight or get to know each other many times, neurotransmitters such as dopamine in the thalamus are constantly secreted and come out unstoppable. Then, we have the feeling of love. Under the action of dopamine, we feel the happiness of love. The same mechanism works when people taste chocolate or addicts "walk in the clouds". Fortunately, our brains can distinguish each other. Dopamine, like a master key that can unlock many locks, produces different reactions in the body according to different situations. The smell and taste of chocolate tell the brain that we are eating; The body odor and fragrance of couples remind the brain that we are in love. The "passion" brought by dopamine will give people the illusion that love can be fanatical forever. Unfortunately, our bodies can't withstand the stimulation of cocaine, which means that a person can't be at the peak of tachycardia forever. So the brain had to cancel this idea and let those chemicals metabolize naturally under its own control. This process usually lasts for one and a half to three years. With the decrease and disappearance of dopamine, passion becomes calm.

So if you believe in love, please don't believe in dopamine

If you believe in dopamine, please do not believe in love.

I hope the answer is satisfactory.