I think most folks know about D3 + K2 + zinc, but you could probably avoided the excess-snot-problem by taking 10,000mg of vitamin C daily in divided doses - works for me - see The Healing Factor by Irwin Stone (and as soon as the itchy throat starts, double the dose etc until you get the runs, then back off, tracking the disease down with decreasing doses accordingly - see Thomas Levy's books).