Bio SculptureŽ Executive Base is a Toluene and Formaldehyde free, multi-functional conditioning base coat that will compress the nail keratin to strengthen soft nails and add nutrients and vitamins while helping polish to chip less. One of the components of Executive Base is Acetyl Methionine, an essential amino-acid derivative that is necessary for the keratin chain synthesis of the nail Do not use on flaky or brittle nails, use only on naturally strong or soft nails as a treatment. Perfect for salon use, individual retail and as part of a Home After-Care Bag.