Some acids are bitter, e.g. in hops https://link.springer.com/article/10.1007/s00253-021-11329-4 https://link.springer.com/article/10.1007/s00253-021-11329-4 an

Some acids are bitter, e.g. in hops https://link.springer.com/article/10.1007/s00253-021-11329-4 https://link.springer.com/article/10.1007/s00253-021-11329-4 and in bile https://www.nature.com/articles/s42003-023-04971-3 https://www.nature.com/articles/s42003-023-04971-3.