To help my nails strengthen and repair I've been using Sally Hansen's nail rehab which has helped to improve the overall condition of my nails. I wear it on it's own or under other nail polishes to help smooth out my nails and help them grow faster. The colour is a natural, nude/pink that gives a slight tint to the nails and leaves them looking shiny and healthy.
A great base coat that has helped improve the look of my nails when wearing nail polish is the Nails inc Kesington caviar base coat. It helps my nail polish last a lot longer and leaves it looking smooth and flawless. Easy to apply and quick drying it's a great option no matter how bad you are at applying nail polish.
With my cuticles being in really bad condition as well as my nails a face oil I've been loving as a cuticle oil is the Pure Super-Active Overnight face oil. To oily to use on my skin but really great at repairing dry skin this is a great option to help my damaged nails and cuticles and even works well when a few drops are combined with a hand cream to help really dry hands.
Regular application of a good hand cream has also helped my nails get back to their healthy selves allowing me to get back to the constant use of Essie's Fear Or Desire- my all time favorite nail polish!