Weleda Arnica Muscle Soak 200ml Weleda Arnica Muscle Soak 200ml Perfect for relieving aching muscles after physical exertion, Weleda Arnica Muscle Soak combines the natural power of arnica with indulgent rosemary and lavender essential oils and invigorating birch leaf extract. Suitable for vegans, the aromatic bath soak will help ease the pain of aching, bruising and strain, assiting in recovery both of body and mind.