Bavaer is a cattle feed produced by DSM ^[1] and is marketed as "a feed additive that reduces enteric methane emissions". In a cow's rumen, microbes help break down food. This releases hydrogen and carbon dioxide. An enzyme combines these gases to form methane. Bovaer is a feed supplement that suppresses the enzyme ^[2].

All substances in Bovaer 10 are: Silicon dioxide, propylene glycol, 3-nitrooxypropanol ^[4]

The warnings given Elanco (the manufacturer) are: Not for human use. Caution should be exercised when handling this product. 3-nitrooxypropanol may damage male fertility and reproductive organs, is potentially harmful when inhaled, and is a skin and eye irritant. Personal protective gear, including eye wear, a dust mask, and impervious gloves, should be worn when handling this product.

The food safety commission of Japan has found in a subacute toxicity study that Bovaer Decreases the absolute relative weights of male testis and epididymis, decreases the sperm count and a decrease in the motor activity of sperm ^[5].

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The table below confirms which companies are and are NOT using Bovaer.

Confirmed using Bovaer	Confirmed NOT using Bovaer
North Australia Pastoral Company [6] Coles [7]	Wyke Farms [8] Gippsland Jersey [9] Norco Milk [10] ButcherCrowd [11]