The Tur (Orach Chaim, Siman 603), based upon the Talmud Yerushalmi, cites the custom for Jews to be stringent during the Aseres Yimei Teshuva to eat exclusively ‘Pas Yisroel’ bread. Even those Jews who generally do not exclusively eat ‘Pas Yisroel’ are encouraged to accept this practice during the period between Rosh Ha-Shanah and Yom Kippur.
We therefore present the links to the OU and COR Pas Yisroel products lists