I had the same problem for ages.

Firstly, I take vitamin and mineral supplements that are especially for hair, skin and nails (I was really taking them for the hair cos mine falls out ALOT!). I am sure u can get them in any good pharmacy, mine was called Perfectil

Also, I used this nail polish Rimmel do.. not 100% sure of the name but u just paint it on and let it do its magic! one good thing I found about it was that it paints on clear, no funny colours... although from the bottle it looks pink?  It really worked!

Hope this helps!

Good luck!

Biotin supplements help many people with weak and/or thin nails. Lots of great suggestions so far, best wishes!

You can make them strong quickly with Neocell Super Collagen.  It comes either as a powder you mix in orange juice or in capsules.  Should cost between ten and fifteen dollars.  Get at iherb, vitacost, Costco, health food stores.

It will also make your skin and hair beautiful! I have used it for two years, its a staple for me.

I take prenatal vitamins and apply a strengthener to my nails. I use OPI, but I'm sure there's a comparable drug store product.

I love Orly 'Tough Cookie' clear strengthener, as well as Orly Nailtrition. 

A great quick easy fix is to apply the Chapstick brand original chapstick to your nails before you go to bed. It moisturizes and hardens up your nails really well. 

Def take your vitamins and protein as well

I use to have the same thing, but this was due to using dark nail polish. I would use it very often and i wouldnt let my nails have free time. What i did was stop using color nail polish for a long while. I ate almonds, which are good for your hair and nails and loaded up on avocadoes. Try food that help your nails get stronger.

Hey Autumn, 

I just read an article on how to grow nails faster and it had some great tips...check it out...How to Grow Nails

I hope it helps!