I'm in my early 30's and haven't gotten my blood checked for anything in particular yet aside from the routine blood work. I have been taking a: Multi-Vitamin, B-Complex, Nutrafol Supplement, and recently PABA supplement. I'm not sure if PABA is safe to be taking it yet I read it can reverse grey. I also have read it can be an Iron defficiency yet my multi-vitamin has 2.5mg of iron in it, yet idk if that's enough. I also heard it can be due to copper deffiniciency. Idk if I have a copper deficiency, would it be safe to take a copper supplement if idk know if that's the case, if yes which one?

I love my hair color and I have thought of doing baby lights or color dye them yet seems hard as it's only a few strands.