Depends what question you're trying to answer. If the question is "Is this the greatest antibiotic ever", well, sure you'll want to compare it against a slew o

Depends what question you're trying to answer. If the question is "Is this the greatest antibiotic ever", well, sure you'll want to compare it against a slew of other compounds. But if your question is "does this increase the speed of healing at all?" as a first test before later, more complex experiments, then this seems fine to me.