Why is kirkland toscano olive oil bitter?

Kirkland Toscano olive oil may taste bitter due to the presence of polyphenols, which are beneficial compounds found in olives that contribute to the oil's flavor profile and health benefits. Bitterness is often a sign of high-quality, freshly pressed extra virgin olive oil, as it indicates that the olives were harvested at the right time and processed without excessive heat or chemicals. Additionally, the bitterness can vary based on the specific olive variety and the region in which they are grown.