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Acetylcholine or ACh is an organic compound used by all sorts of living organisms for a variety of functions; in humans (and many other animals) it acts as a neurotransmitter that operates at the junction of muscle and motor nerve, and is the chemical that activates muscle fibres to contraction. ACh is released by the nervous system as part of the relaxation response. This is process is often summarized as “rest and digest” or “feed and breed” as ACh plays a crucial role in digestion, arousal, reward, resting, and feeling relaxed and tranquil. White version.

Estradiol is the most potent steroid of the four major estrogen hormones that human bodies naturally produce, and it is responsible for developing and regulating a variety of biological processes and physical characteristics in both male and female bodies. 17β-estradiol can also be synthesized from plant products, and is used in a wide range of therapies including for menopause, hormone replacement therapy, and certain types of cancers.

This antidepressant is in the SSRI (Selective serotonin reuptake inhibitor) category, and is commonly used for a variety of physical and psychological health treatments.

Mirtazapine, also commercially marketed under Remeron and other names, is a tetracyclic antidepressant and antihistamine. It is also used to treat conditions involving difficulty sleeping, as one of its side effects is drowsiness. Weight gain, constipation, and dizziness have also been documented, along with lowered white blood cell counts. Withdrawal symptoms have also been noted with stoppage, and its mechanism of action is not fully understood. It is typically prescribed for the treatment of mood disorders such as major depressive disorder.

Testosterone (T) refers to both a naturally occurring human steroid hormone as well as the same compound when given as an androgen medication. It is used to treat hypogonadism in males, certain types of breast cancer, for masculinizing hormone therapy, and can also be used in doping to improve athletic performance.

Serotonin is a monoamine neurotransmitter, popularly known as a contributor to feelings of well-being and happiness, though its actual biological function is complex and multifaceted, modulating cognition, reward, learning, memory, and numerous physiological processes

Estradiol is the most potent steroid of the four major estrogen hormones that human bodies naturally produce, and it is responsible for developing and regulating a variety of biological processes and physical characteristics in both male and female bodies. 17β-estradiol can also be synthesized from plant products, and is used in a wide range of therapies including for menopause, hormone replacement therapy, and certain types of cancers.