Lots of good suggestions here. The only nail polish I can use is OPI. otherwise my nails turn yellow. I use nail polish only occationally. hobo is correct Calcium, Magnesium, Vit D (Vit D also great for cancer prevention) and Carlson Norwegian Cod Liver Oil. (always take calcium and magnesium together as if not used together they are not absorbed by your body) Zink good also.
Just attended a worshop in Qigong and tapping the fingers either together or on a table or such is great for your health, excellent for strooke victiums too.
Another good oil is coconut oil, internal and external. VERY good for your health. and water, water, water.