Toxic Effects of Glyphosate

Properties of Glyphosate

Glyphosate, with the chemical formula C₃H₈NO₅P, is a broad-spectrum herbicide commonly used to control the growth of weeds and unwanted vegetation. It was first introduced by the agricultural company Monsanto (now part of Bayer) in the 1970s and is marketed under various trade names, including Roundup®. The global use of glyphosate has significantly increased in recent years, driven by the adoption of glyphosate-resistant crops and the economic benefits they offer in agriculture. This has resulted in glyphosate-based herbicides becoming dominant in the pesticide market, with an estimated annual usage of 600,000 to 750,000 tons. Projections suggest that glyphosate usage will continue to rise, reaching approximately 740,000 to 920,000 tons by 2025.

Toxicity of Glyphosate

• Acute Toxicity
  The acute oral toxicity of glyphosate to mammals is generally low, but there have been reported deaths from deliberate overdoses of concentrated formulations. The surfactants present in glyphosate formulations can increase the relative acute toxicity of the product.
• Chronic Toxicity
  The potential long-term effects of glyphosate exposure are a subject of ongoing research. The International Agency for Research on Cancer (IARC) classified glyphosate as "probably carcinogenic to humans" (category 2A) in 2015 based on limited evidence from human studies and sufficient evidence from animal studies. This classification is controversial, and other regulatory agencies, such as the U.S. Environmental Protection Agency (EPA), have concluded that glyphosate is not likely to be carcinogenic to humans.
• Neurotoxicity
  Current knowledge suggests that glyphosate exposure, including exposure to its commercial formulations, can have neurotoxic effects on the nervous systems of various animal species, including humans. Exposure during early life stages can disrupt normal cell development, affecting processes such as differentiation, neuronal growth, and myelination. Glyphosate can also impact neurotransmission and lead to oxidative stress, neuroinflammation, and mitochondrial dysfunction. These processes can result in neuronal death and contribute to behavioral and motor disorders. The doses of glyphosate that produce these effects are lower than regulatory limits. While there are some discrepancies in the findings, it is clear that glyphosate exposure can cause significant structural and functional alterations in the nervous systems of humans, rodents, fish, and invertebrates.
• Environmental Impact
  Glyphosate can have adverse effects on non-target organisms and ecosystems. It is known to be toxic to aquatic organisms, such as fish and amphibians, and can also impact soil microorganisms. Additionally, there are concerns about the development of glyphosate-resistant weeds, which can lead to increased herbicide use and potential environmental consequences.