I've had a horrible time with my nails being brittle, and splitting up the middle. (yes, it hurts) Thyroid is fine. Always take a multi-vitamin.

Started taking biotin which has helped in my opinion. While watching TV, I give my nails and cuticles a nice massage with Vitamin E nail & cuticle oil.

I also use several coats of Hard as Nails. I use a pop top opener now instead of my finger to open cans. Less dishwashing. This approach has been helpful. Not so many splits up the middle...ouch!

My hair has thinned since taking mood stabilizers and antidepressants. I try to wear a hat if I'm in the summer sun for long periods of time. My scalp with get very sunburned. Don't know if the meds are the reason...beats the alternative!

Hope it gets better Salukigirl