I have not read that surfur dissolves gallstones. Clark uses herbs which facilitate an exchage of magnesium for the calcium in hard stones, the magnesium salta are more soluable than calcium salts. Moritz'a malic acid/apple juice 'softens' hard stones but I don't know the chemical process. The sulfer in amino acids is used for detoxification of pollutants and natural toxins. Telman wrote that the sulfur in ES aids in the cleansing of the bile system but he did not mention reaction with gallstones. He did not explain the chemistry, just that it works better than other magnesium laxatives because it has sulfur.