Feeling sluggish? Gaining weight? What you need is a shot in the arm, claim advertisers for trendy vitamin B12 injections. Don’t let marketers needle you. “If medical testing confirms that an ...

Ever get that tingly feeling in your feet and hands? Are you a little more tired than usual? Unusually fatigued? Does even your brain feel drained? Have a migraine headache, too? It could be you're ...