Lysine is an amino acid which is marketed in blogs (health blogs, mostly) to heal viral side effects such as skin lesions in Herpes Virus and other similar viruses. The virus gets killed after being exposed to lysine when it absorbs the amino acid. Viruses are not able to metabolize the lysine and therefore cannot proliferate. Mary, my wife, took some when she had the shingles. I'm taking it and so is she to ward off any return of virus or any viral issues brought on by stress.
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