Terrasil is not sold in brick-and-mortar stores; it is sold exclusively online. However, Walgreens.com customers can order Terrasil online and pick it up at their local store.
Other online retailers such as Amazon.com, Drugstore.com and AidanceProducts.com sell the product and ship it directly to the customer. Aidance, the maker of this infection and wound care ointment, claims it promotes faster healing and kills bacteria up to 21 times faster than other brands. The ointment's ingredients include allantoin, bentonite mineral clay, tea tree oil, magnesium oxide and silver oxide. As of 2015, customer reviews for the ointment on Amazon.com are generally positive.