I have been taking a vitamin D supplement since the start of Covid pandemic to give my immune system a boost (as recommended by Dr John Campbell).
I have noticed that my nails are much much stronger - no splitting, cracking or flaking at all. In fact i'm having to file them much more often as they are also growing much faster.
I assume that anyone who has thin weak hair would also notice an improvement - I have very strong thick hair so i've not noticed a change myself.
Has anyone else taking VitD noticed any changes?
I've got another 'keen'... Ouch!