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Below is the response from Westin Inc regarding their Mario olives.

Just thought I would share,

Barbara in Missouri

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Hello:

Thank you for your e-mail requesting information about our Mario Olive =
Products.  Olives are gluten free.  The ferrous gluconate you see listed =
on the black olives label as a preservative is derived from corn so your =
husband can eat all olives.  I'm sending you some coupons redeemable for =
any Mario Olive products so he can eat only our brand.  Thanks again for =
contacting us.

Betty Hoffman
Customer Relations

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