Essential for bone and mineral metabolism, it has been found to affect other systems, including the cardiovascular, muscular, endocrine and nervous. But only for those with genuine deficiency, vitamin D supplementation have significant benefits.

A blood test will show your vitamin D levels...

Joint pain and osteoarthritis are commonly treated with glucosamine, and it helps with pain relief and slowing down arthritis.

Be sure you are using glucosamine sulfate, as glucosamine hydrochloride has been shown to be less effective. 

Whey protein has been shown to help aging men increase or preserve muscle mass, which is very important for mobility and overall health. To find out if you should use it, work out whether or not you are not eating enough regular protein.