To prototype products, we would need samples of what we want to manufacture, with a minimum of 50 ml. per product. Experience shows that what is published on labels does not always match, so our Master Formulator goes by textures and ingredient list (when it matches). You would formulate only once and send a sample that allows for only one modification. Before formulating you would fill out a comprehensive form to ensure that the requirements are put in writing. If after the first sample and modification you are not satisfied, you must pay for another formulation.