Re: Protein Shakes + Vitamin D
a, b) The only problem with using the protein shake along with the Vitamin D supplement is that you might get too much D. Check the label, if the shake has more than a little D in it, ask your doctor or pharmacist before using.
Vitamin D is fat-soluble, which means if you take too much, your body has a harder time getting rid of the extra. D overdose isn't a common problem, but it is possible. Don't take more than prescribed, and your doctor should have scheduled a follow-up blood test to monitor your levels.
c) A protein shake will not make you huge. To get huge muscles, women have to either take steroids or work VERY VERY hard in the weight room. I've done weight training and protein shakes for years, and I've only managed to get firm.
d) I suppose it's possible that getting enough Vitamin D could be making your hair oilier. Maybe you just need to buy a shampoo labeled "for oily hair."