Health Canada says its decision to approve a popular weed killer won't be affected by the retraction of a key research paper.

The 25-year-old study said the main ingredient in Roundup — the herbicide glyphosate — is safe for humans.

The journal Regulatory Toxicology and Pharmacology retracted the paper last week, citing documents made public through litigation in the U.S.

"It was like a bomb dropped," said Beatrice Olivastri, CEO of Friends of the Earth Canada.

"It's really a foundational paper against which a lot of regulatory agencies made decisions about whether or not glyphosate was safe."

The retraction notice cited documents made public through litigation in the U.S. that suggest employees of Monsanto, which makes Roundup, may have helped write the article without proper ackno

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