Tonic is a therapeutic herb shop and elixir bar. They serve teas, coffee, smoothies, and snacks, including vegan and gluten-free options. They provide botanical medicines, trained herbalists on staff, and workshops. At mile marker 72.7, take the circuitous ramp from the towpath to Shepherdstown Pike. At the top of the ramp, turn left and cross the bridge on a wide sidewalk. Continue for 1 mile and then turn left on W. German St., following signs for downtown Shepherdstown. Continue for .3 miles, and Tonic Herb Shop will be on your right.