Try Sally Hanson's Nail strengthening and Growth Polish system. It's a clear polish that strengthen's your nails and makes them grow faster. You put it on everyday, one coat a day. I did this and noticed a huge difference in a matter of 1 week.
I've also heard and belive this old wives tale: Clicking your finger nails on the table (like strumming your fingers from pinky to index finger) stimulates your cuticles and will also grow your nails faster. I do both and my nails are long and healthy. Once they get long, try and keep a polish on them...even clear. Hopefully, this helps.
Omega 3's (fish oil) are huge in great hair, nails and skin, plus a zillion other things, however, it is not an overnight cure. It does take some time to work. I take 6 omega 3 pills a day, three with breakfast and three with dinner, and my hair, skin and nails have never been better, but I have been doing this for a few years now. Kirkland brand at Costco are inexpensive and purely sourced, you do need to watch the sourcing as some brands might have mercury from the fish. One other thing, I take them right before I eat, so that I never get the fish oil burps afterwards.
I know someone has already suggested this, but prenatal vitamins work great. I take them everyday as my multi-vit. They have extra folic acid and vit B's which help with hair and nails. You might not notice the difference in 3 weeks though.
Hi,I was also having this problem. I used to have long healthy nails. My mom was telling me she couldn't believe how much her nails were growing. She was just taking calcium supplements w/vit D in them. I tried them, and I swear, within 4 days my nails had grown at least a half inch. I'm taking Caltrate 600 D Plus 2x per day. Try that, prenatals are good too, but the iron in them is quite strong and can be constipating. Good Luck, you've gotten some pretty good ideas.