Recently I have been noticing that my three year old neutered cat's whiskers are turning a shade of orange/copper/(they were black). I wonder if this could be a sign of a dietary deficiency (he is a *very* picky eater). He also spends some time sunbathing, so I also wonder if it might be due to sun exposure. I've tried taking a picture of him, but I can't get the color to show as it is. I'll keep trying and post it if I'm successful. He is otherwise active and seemingly healthy. I've read about tyrosine deficiency and I'm afraid this could be it, but the strange thing is that it's just his whiskers, not his coat. Still, just to be safe, could I supplement with tyrosine? If so, any recommendations on a tyrosine supplement that could pass undetected by his Highness Mr. Gato?