Whether it's too many improper gel removals, acrylic extensions for years, or just weaker nails, sometimes our nails just need a teeny bit more TLC. Enter: OPI Nail Envy Nail Strengthener (£20). It's a little on the expensive side, but it's worth it — trust us. The formula is rich with calcium, and hydrolysed protein helps avoid splitting and peeling, in addition to helping speed up the natural nail-growing process.