I'm a Jew from Iran. I want to know if baking powder is kosher without any certificate since they don't exist in Iran. Generally baking powder include TARTARIC ACID.
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Star-K, a recognized kosher authority, writes here that baking powder is kosher without a hekhsher, if they do not have additives and if food items are not a product of Israel. R Moshe Vaye, a leading kosher food authority in Bnei Brak, agrees.
Therefore there appears to be no issue with baking powder. Still, since we are not familiar with Iranian manufacturing processes, it would be worth asking other observant Jews if their custom is to use baking powder without certification.