| Summary: | Seaweeds contain a myriad of nutrients and bioactives including proteins, carbohydrates and to a lesser extent lipids as well as small molecules including peptides, saponins, alkaloids and pigments. The bioactive bromoform found in the red seaweed <i>Asparagopsis taxiformis</i> has been identified as an agent that can reduce enteric CH<sub>4</sub> production from livestock significantly. However, sustainable supply of this seaweed is a problem and there are some concerns over its sustainable production and potential negative environmental impacts on the ozone layer and the health impacts of bromoform. This review collates information on seaweeds and seaweed bioactives and the documented impact on CH<sub>4</sub> emissions in vitro and in vivo as well as associated environmental, economic and health impacts.
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