If you need eye drops for dry eyes â known as artificial tears â choose a brand without the preservative benzalkonium chloride, which can cause irritation, says Andrew Lotery, professor of ophthalmology at the University of Southampton. âYou tend to find it in eye drops that come in bottles,â he says.
Endorphins are natural opium-like hormones that are produced by the pituitary gland and the hypothalamus of your body. Endorphins act on your brain's opiate receptors to block their ability to receive pain messages from the sensory nerves. This makes you less sensitive to pain. Endorphins also work on your emotions.
It is from morphine that heroin is made. Morphine is made into heroin with a chemical reaction containing the chemical compound acetic anhydride. The heroin is then purified using chemical or mechanical means.pium and morphine, from which heroin is made, come from a variety of sources: 1  Afghanistan-leading illegal opium and heroin exporter producing up to 82% of the world's supply. 2  Pakistan, Southeast Asia, South America-other illegal sources.