Do raw nuts need a hechsher?

Answer: No, if raw and unflavored (cRc). Roasted, cooked or flavored nuts: yes.

Reason: Raw nuts have no kashrut concern; roasting, cooking and flavoring add one.

Source:

• cRc: unflavored raw nuts (including blanched or pasteurized) are acceptable without hashgachah if nothing sensitive is added; nuts that are roasted (dry or oil roasted), cooked or flavored require a reliable hashgachah.

Related questions:

• Do loose roasted peanuts need a hechsher? Yes.

References: cRc (askcrc.org), “Nuts”