A Collection of the Most Poisonous Substances Known To Man

The structure of nature is mysterious, but cleverly engineered at the same time. All compounds share a relationship with one another that facilitates the creation of a perfect ecosystem. People learned how to utilize these compounds for their daily living, but within these things are substances that were found to be lethal.

Man first learned about these poisonous substances from accidents, but now, toxicologists have reached the level where they can detect and study these substances without exposing themselves to risks. Here is a list of the most poisonous substances known to man.


One of History’s most famous poisons, Arsenic.

Arsenic occurs naturally inside the earth’s crust, and it’s released through volcanoes. Now, it’s being produced in different countries, and is used to create rat poisons, insecticides, paints, soap, candles, and toys.

Arsenic was also known to be a murder weapon because it can kill a person when used in large doses, and it’s hard to detect. It can also contaminate drinking water, especially in remote areas. Long-term exposure to arsenic will weaken the cardiovascular and nervous systems. It can also cause cancer of the skin, lungs, and kidney. If not treated, arsenic poisoning will result in coma and death.

To avoid arsenic poisoning:

  • Check your source of water; make sure that it’s clean, or use a filtering tool to decrease arsenic content.
  • Label your rat poisons and keep them in a safe place.
  • Don’t let your children chew on their toys.

Botulinum Toxin

Beauty in a bottle. Botox A.K.A Botulinum Toxin Type A.

Botulinum Toxin or BTX is produced by a bacterium called Clostridium Botulinum. Even with the word toxin in its name, it’s still used in the medical field to treat disorders such as uncontrolled blinking and crossed eyes. It’s also known for reducing wrinkles on the forehead.

Administering BTX in a clinical setting is still dangerous because it can be injected in an unintended muscle group which can cause paralysis, and muscle weakness. It becomes detrimental when it reaches critical muscle parts because it can lead to seizures, heart attack, arrhythmia, and death.

To avoid BTX poisoning:

  • If it’s only for cosmetic use, avoid BTX shots.
  • If you really need BTX shots, search the history of the hospital and the doctor who’s going to administer the injection.



Mercury is a liquid that’s obtained by condensing the vapor from a heated cinnabar ore. It’s widely used in thermometers, barometers, and fluorescent lamps.

Mercury has liquid properties, and it can accidentally be consumed orally. Humans are also exposed to mercury via inhalation of mercury vapors, and eating fishes like shark and swordfish. Once inside the body, it can easily hop through the bloodstream and travel to the brain. High exposures to mercury may result in damaged kidneys, respiratory failure, coma, and death.

To avoid mercury poisoning:

  • Avoid eating fishes from the ocean. These fishes have more mercury content than fishes from lakes and rivers.
  • Store thermometers and other materials with mercury in a safe place where they will not break and spill the mercury content.


It’s best to be aware of the most poisonous substances known to man so that you can avoid them. If you believe that you were exposed to these substances, it’s better to rush to the nearest hospital. Don’t try to self-medicate because it might assist the circulation of poison inside the body.


hazardous chemicals

What are Hazardous Chemicals?

Hazardous chemicals are substances that pose danger to life forms such as humans, animals, and plants, and to the environment like rivers, oceans, soils, and air. The effects of these chemicals vary, depending on the level of exposure and their toxicity.

Some cause immediate loss of life and permanent damage. There are others that will take longer exposure times before their effects manifest. In human history, there are different large-scale incidents which are associated with the misuse or mishandling of these substances. Effects of some of these incidents can be felt up to these days even if it happened decades ago.

Because of the risks involved in the use and handling of these hazardous chemicals, government rules and regulations are already in place in line with their use, handling, transport, and disposal.

Some nations have sophisticated facilities that are used specifically for the safe use and disposal of these chemicals. There are also numerous public and private groups promoting awareness and training about the proper use of these substances.

Like other common substances, hazardous chemicals can be in the form of solid, liquid, and gas. Some are naturally occurring, while others are a result of man-linked activities such as plant processing and oil refining.

Hazardous chemicals can also be found in things we use every day. They can also be present in some of the things that we have at home, at school, or at the office.

Below are examples of the chemicals we commonly come in contact with:

Air Fresheners
Choose Your Air Fresheners Wisely.
  • Bisphenol A or BPA, which can be found on plastic bottles and food cans. BPA causes behavioral changes in children, and miscarriages in pregnant women.
  • Phthalates are present in household fragrances such as air freshener, insect sprays, and soaps. This substance is known to cause asthma, loss of sperm-count in males, and certain mental issues.
  • Ammonia is a vital component of products such as window cleaners and polishing agents. Prolonged exposure to this substance can cause respiratory problems such as bronchitis and asthma. It can also produce a poisonous gas when mixed with bleach.
  • Arsenic is a naturally-occurring substance that can be found in water and, in low levels, in rice. It can cause skin and digestive problems. Ingestion of large amounts of this substance can cause paralysis and blindness.
  • Polybrominated diphenyl ethers are used to slow the speed of flames. They’re commonly found in electronic products such as television and computers, and foam products such as pillows and quilts. This substance is known to cause thyroid issues.
RoHS Information

What is RoHS?

RoHS (Reduction of Hazardous Substances) was introduced back in 2003 at the European Union. RoHS is concerned with reducing the effects of electronics on the environment, and with the health of people using those electronics. Its purpose is to make electronic products safe for both consumers and manufacturers.

RoHS (also called Directive 2002/95/EC ) is a restriction on the usage of hazardous materials found in, or used in the making of, electronic products. Since July 1, 2006 all products produced in, or coming from EU countries, must first pass the RoHS guidelines before being sold.

Restrictions under RoHS

Restricted materials banned under RoHS includes lead (Pb), Polybrominated Diphenyl ethers (PBDE), Mercury (Hg), Hexavalent Chromium (CrVI), Cadmium (Cd), Polybrominated Biphenyls (PBB), and four different phthalates which includes DEHP, BBP, BBP, and DIBP.

RoHS Importance

RoHS Symbol
The RoHS Symbol

RoHS is important because it protects the welfare of consumers, manufacturers, and the environment. It also prevents the harmful effects of chemicals on our health and surroundings. Also, due to the introduction of certain chemicals since the 20th century, consumers and manufacturers seemed to not truly understand the dangers of such chemicals.

Companies Affected by RoHS

Companies that produce electronic products such as cell phones, and any businesses or resellers that sell these electronic products directly in EU countries, are subject to the restrictions regarding these materials. Also, those companies in European countries importing electronic gadgets to other countries also need to abide by RoHS.

Product Tests under RoHS

For the screening and verification process of the electronic products, portable ports analyzers are used, such as X-ray Fluorescence and XRF Metal Analyzers.


The Waste Electrical and Electronic Equipment Directive (also known as WEEE) is the directive related to the collection and recycling of waste coming from electronic equipment. As RoHS covers the restrictions on the usage of dangerous chemicals, WEEE relates to maintaining cleanliness in regard to the hazardous substances used in making electronic products.

RoHS Benefits

RoHS is beneficial for people, companies, manufacturers, and for our environment.

For the People:

  • RoHS helps in reducing the dangers of chemicals in every electronic product that people use
  • RoHS also helps to protect workers in electronic companies from getting sick as a result of dangers from the materials.

For the Companies/Manufacturers:

According to a blog about the benefits of RoHS to electronic companies, the benefits are the following:

  • 15% said that because of RoHS their company gained market share
  • 25% improved their company supply process because of RoHS

For the Environment:

  • The end of wastes from hazardous substances
  • Protection of the environment for the future


RoHS Compliant Logo
Just Look For the RoHS Compliant Logo at the Box.

Overall, not only companies or manufacturers are protected from the hazards of the materials or chemicals mentioned above, but consumers are also. With this, consumers need to make sure that what they buy, especially electronic products, has been cleared and passed by RoHS.

Therefore, in order to follow the guidelines given by the EU regarding RoHS, we must be very careful of what we produce, purchase, and consume. After all, those who are really affected by the dangers of these hazardous substances are us – the people! In addition, our environment is also suffering from the waste products resulting from the use of these dangerous chemicals.