You can view the kosher certificates of the various products on the relevant product pages.

'Or Le Shabbat' products undergo strict halachic testing by the Institute of Science and Technology for Halacha. The activity of the Institute is led by the Gaon Rabbi Avraham Moshe Halperin , son of the founder, the Gaon Rabbi Levi Yitzchak Halperin.
Rabbi Eliyahu HaCohen Rosenberg has been cooperating with 'Or Le Shabbat' since its establishment and regularly advises on the Halacha issues relevant for our products. Rabbi Eliyahu also performs the supervision required to exempt the relevant products from immersion.