Raw Cashews
Raw cashews from the grocery store aren’t exactly raw. These are steamed to remove the dangerous chemical known as urushiol. You should avoid ‘real’ raw cashews should you encounter these, as it can cause an unpleasant reaction to your skin.
Elderberries
Elderberries are generally used as a medicinal plant and are ingredients to treat colds and skin wounds. However, the twigs and leaves can cause nausea and serious illness if ingested. This is because these components contain a chemical closely relating to cyanide.