Arnica gel FAQ What are the side effects of arnica gel? A. Topical arnica gel can cause a mild allergic reaction in people that have allergies to the Asteraceae plant family.

They are commonly used on the skin as a topical gel, ointment or cream since oral arnica remedies need to be diluted to offset dangerous side effects if ingested.

They are commonly used on the skin as a topical gel, ointment or cream since oral arnica remedies need to be diluted to offset dangerous side effects if ingested.