Why are my fingernails fragile?

It should not be related to a sign of aging as I know many people well over 50 with strong nails.

You can try B complexes there are supplements specifically formulated for hair and nails online you can get accurate reviews.

Nails are like skin and hair as an indictator of internal health. Certain things to be concerned about are striations and lines and bumps in particular.

Is your hair dry and falling out also? Eyes dry?

I would get a blood test for your thyroid to see if you are under or over medicated. Check for a change compared to old numbers, and if you are near the ends of normal, even though you are in nornal, consider changing your dose by a mini small amount, like 10–30 mcg a week depending on your current dose.

Also, many people say taking biotin helps their nails a lot. But, a sudden change is probably more than just biotin, you should investigate what might have changed.

I have the same issue. You thyroid medication could be out of balance. You cold also find improvement with calcium and vitamin D supplements.

Thyroid will cause issue with skin, hair and nails. Medication for thyroids isn’t a perfect solution, but it could also be age related. As we age we don’t actually make as much vitamin D from the sun as we use too. Get your blood drawn to see where all your vitamin and mineral levels are at.
I had the same issue and after about a year or more, of taking vitamin D3 and fish oil, or vitamin E, and sometimes B vitamins, my nails were finally healthy and strong. Then I went and got false nails for a wedding event and it totally crapped my nails all over again.
Back to the drawing board.
Oh almost forgot to add. What really helped my nails was when I started to wear rubber gloves to do my daily house chores that would involve getting my hands wet and always lotioning my hands with heavy hand cream that had vitamin E in it and I made sure to rub it around my nails. Wow, I’m glad I answered this post. I forgot all about that. I’ve been washing without my gloves lately and I haven’t been diligent with the cream.

Interesting about the D comments. I have severe vitamin D deficiencies without supplements, but I never related it to my nails. I never thought about it. I don’t think I have observed a differece with my nails and vitamin D, Interesting.

But, I agree with everyone that you should have your vitamin D checked if you never had. The D has made a tremendous difference in my life.

If it is not contraindicated with any of your medications, try biotin (5,000 mcg twice a day).