anadamide (ananda is sanskrit for "bliss).
It's called dopamine. Pronounced "dope-a-mean".
Diamond
The Substance produced that kills pain is called Endorphins
A poisonous substances of natural origin produced by an animal is called venom.
water effects chemical
The hardest naturally occurring substance is called diamond. It is a form of carbon.
It is a natural occurence of a substance called semen.
Some effects of Nightshade plants/ vegetables (which contains substance called alkaloids) are as follows: digestive and nervous system malfunction and swollen.
A substance that promotes the activity of a neurotransmitter is called an "agonist." Agonists bind to neurotransmitter receptors and mimic or enhance the effects of the natural neurotransmitter, thereby increasing its action in the brain or nervous system. For example, morphine acts as an agonist for endorphins, promoting pain relief and feelings of euphoria. This interaction can lead to various physiological and psychological effects depending on the neurotransmitter involved.
You can, but you shouldn't. in the water there is a substance called mescaline which causes hallucinations.
Placebo
The substance that absorbs radiation and helps protect living organisms from its harmful effects is called a shielding material.