The Natural Nail Boost System (NNB) protects the natural nail and provides beautifully, strong and evenly growing nails. Acid-free Natural Nail Boost Gel is a solvent free Permanent-Gel polish and is applied in a very thin layer that offers a perfect polish base. Highly elastic and flexible to stabilize nails, prevent breakage, and support nail growth. Regardless of how many times you wish to change your nail polish, the base stays intact. Non-soak off system grows out with nails - easy refills every 3 weeks. NNBG is not recommended or suitable as a base under soak-off gel polish. Available in two variations.