Treatment/polish to grow and strengthen nails?

i just soaked off my acrylics and my nails are super weak...i purchased this stuff called Retoration from a company called Jessica....i love this stuff!!! I have bought a couple stuff from the already..cuticle oil and top coat...there stuff is awesome!!!
 
Nailtique didn't work very well for me. I am obsessed with rejuvacote. I am not sure where to buy it. I have seen it on a beauty website but I can't remember the name. When I find it I will post it.
 
I just took off my shellac nail polish that I've been wearing for about a year. Prior to that I wore gels for about two years. My nails need a little TLC, till I start beating on them again! Any recommendations for a brush on product? I already take 5000mg of biotin daily. Thanks for any suggestions.