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Ian Musgrave, Senior lecturer in Pharmacology, University of Adelaide

Bovaer is added to cow feed to reduce methane emissions. Does it get into milk and meat? And is it harmful for humans?

Valdis Skudre/Shutterstock

Concern has been rising over the use of a feed supplement, Bovaer 10, to reduce methane production in cows.

Bovaer 10 consists of silicon dioxide (basically sand), propylene glycol (a food stabiliser approved by Food Safety Australia New Zealand) and the active compound 3-nitrooxypropanol (3-NOP).

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