Arnica is a medicinal plant that has been used for centuries for its healing properties. Arnica is known for its anti-inflammatory, antiseptic and analgesic effects. It is often used to relieve muscle and joint pain, bruises and contusions. Arnica is generally considered safe and well tolerated, but it can cause side effects such as redness, itching, and skin irritation. It is therefore important to use formulas made by professionals so that the dosage and its combinations are adapted to your use.