A Vogel Atrogel Arnica Gel (100ml). Arnica Gel. Atrogel is a herbal remedy made from extracts of fresh Arnica flowers and is an easy-to-apply non-greasy gel.. A.Vogel Atrogel Arnica Gel 100ml is a herbal remedy made from extracts of fresh arnica flowers.. It is an easy-to-apply non-greasy gel.. It is used to relieve pain in conditions such as muscle aches, stiffness or after sport.. 1g of gel contains 500mg of extract which is equivalent to an average of 160mg fresh Arnica flowers,