A homeopathic medicine is believed to be more effective when its active ingredient is diluted: this is the minimum dose approach of homeopathy. The purpose of potency is to dilute the active ingredient until it can do no harm and to invigorate the base substance with energy such that the qualities are preserved while the substance itself is diluted out.
On a homeopathic drug product, the drug strength or potency appears directly after the name of the active ingredient. Unlike conventional medicines that typically report drug potency in milligrams, homeopathic potency is indicated by a numeral followed by an X or C. the potency of a medicine such as 6X or 30C says how many times and by what ration the base substance has been diluted. While counterintuitive, the potency is higher though the concentration of an active ingredient is lower.