signaling protein that, when suppressed, may grow hair by reducing inflammation and stem cell loss  
        growth factors taken from your blood and injected into your scalp to stimulate hair  
        a copper peptide showing promise in both regrowth and reversing gray hair  
        commercial product with a blend of mostly natural ingredients for hair regrowth  
        Heavy duty finasteride that comes with higher risks, but scalp injections seem safe and are gaining popularity