Yes. I have been taken two x Adcal tabs each day (GP's orders), and Aldronic Acid once a week. Have spent most of my adult life despairing about my nails, which were always breaking and splitting - never looked good. As a teenagerI treid everything there was, even eating a cube of jeely each day (Ugh!!), spent a fortune on lotions and creams, etc. to no avail. The only time they were ever good were during each of pregnancies - but as soon as babies were born, they broke and got back to normal bad state.
Now, I am delighted with my nails. They look really respectable. I have put it down to Vit D etc. as that has been the only real change in my life.