I believe that contract manufacturers need to take a proactive stance and:protect their interests when bringing a new client's formulas into their plant. Thus, they should require new clients to show preservative efficacy data that meet their acceptance criteria-not just PCPC (CTFA) or USP criteria-because these are not stringent enough. If this is not done, sooner or later micro contamination problems will occur because one or more formulas being made in the plant will allow the development of house organisms that put other products at risk.