Without Supervision on Tithes and Offerings

I would like to know, in the area I pass through, there is a store that sells fruits and vegetables without any kosher certification. Is it permissible to buy there initially and separate tithes and offerings? If so, should it be done without a blessing? The seller claims everything is tithed, but I am unsure of his reliability.

Hello,

One cannot rely on the seller.

Vegetables can be purchased and tithes and offerings can be separated according to the law.

Fruits need to be checked for the issue of orlah, and then it will be beneficial to separate tithes and offerings.

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