Safety Guidelines Safety Guidelines for Eucalyptus Radiata Essential Oil: Non-toxic, non-irritant, and non-sensitizing. People with high blood pressure and epilepsy should avoid eucalyptus oil. Excessive use of this oil may cause headaches. Do not take eucalyptus essential oil internally. Safety Guidelines for Silver Fir Essential Oil: Non-toxic, non-irritant (except in high concentration and to those with highly sensitive skin) and non-sensitizing. Avoid during pregnancy. Do not take silver fir essential oil internally. Safety Guidelines for Piñon Pine Essential Oil: Piñon pine oil is non-toxic and non-irritant. May cause allergic reactions in sensitive or allergy-prone individuals; do a patch test first and use sparingly. Do not take piñon pine essential oil internally. Sorry, no substitutions on packages.