Extracting oil from mustard seeds can be harmful due to the potential health risks associated with the process. Mustard seeds contain compounds known as glucosinolates, which can release harmful substances called isothiocyanates when crushed or processed. These isothiocyanates have been linked to various health issues, including potential damage to the thyroid gland and interference with iodine uptake.

Furthermore, the extraction process itself can involve the use of chemical solvents such as hexane, which can leave residues in the final oil product. These residues may pose health risks if consumed regularly over time.

In addition, the high temperatures used during the extraction process can lead to the formation of harmful compounds such as trans fats and lipid peroxides, which are known to have negative effects on cardiovascular health.

Consuming oil extracted from mustard seeds that has been processed using these methods may therefore increase the risk of developing health problems such as thyroid issues, cardiovascular disease, and other related conditions.

To minimize these risks, it is important to choose mustard seed oil that has been cold-pressed or expeller-pressed, as these methods do not involve the use of chemical solvents or high temperatures. Additionally, consuming mustard seed oil in moderation and as part of a balanced diet may help reduce the potential health hazards associated with its consumption.