For the natural nail only. Enhances adhesion, stabilises, nourishes and strengthens. LCN Bio Bond has been enriched with urea and a modern derivatised L-cysteine, which contains Keratin-forming and strengthening Amino Acids with strong anti-oxidant properties. They function without primer and do not contain any nail-damaging bonding system. LCN Bio Bond can be used under any light-curing LCN gel.