Traditionally known as the best natural astringent and skin healer available, witch hazel contains tannin: highly efficient compounds that react with proteins to produce a contracting and tightening effect on tissues to which they are applied. This process is highly effective in reducing the appearance of wrinkles and fine lines. Witch hazel has tremendous ability to act as a vaso-constrictor, i.e. narrowing blood vessels and so reducing thread veins etc.