There is a small store in Tenderloin that sells halal food, but I can't remember exactly where. Maybe Eddy and Leavenworth, and it's a private store, not a trader joes. Tenderloin is not the most pleasant neighborhood to walk, but it's safe. This Trader Joe that you are asking about is about 10-15 minutes walk from Lombard plaza, food is good but I could not tell you if it would be considered halal.
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