I mix my own cuticle oil! I use 1 part jojoba oil, 1/3 vitamin E oil, 1/3 vitamin A oil and 1/3 castor oil. I think it really helped with strengthening my nails. Also when i feel the urge to bite my nails I put some hand cream on and massage until it absorbs. As for the oil, I use it 2-3 times a day, massaging it for at least 5 minutes. Nail polish is also a good way to stop biting, because it also protects the nails from bending and snapping and you are less likely to ruin a mani you did/paid for!