There is a product that I bought at Sally Beauty Supply. It is a nail strengthener, that you paint on every day layer after layer. Build it up for a week or so, then take it off and start over. I had a nail that kept splitting down the middle, and had for a long time, couple of years, and this stuff eventually solved the problem. I would put it on, let it dry, then take a very fine nail file, the extra fine sandpaper kind with multiple grits on one board, and buff it out to a semi-gloss so it didn't look like I had painted nails. I can't remember the name, but it sure seemed to work for me. Square bottle, 1 1/2" tall plus the top. Red printing on the glass. It might have been a Sally Hansen product. It also made that nail, which was very brittle, much stronger. It was on my right middle finger, so I used it a lot, playing guitar, that is. OK, OK, when I drive too.
The other thing I used, also from Sally, was the powdered Nail resin that you build up on your nail and a form, then sand down and shape to your desired look. It worked too, but I think those resins dried out the nails, and was not good for them. The powder worked, but the other stuff seemed to be good for the nail, and made them stronger.
But seriously gibe the gelatin tabs a shot.
