You may use Histamine, Renotin, Mecholyl, Iodide ions for vasodilatation. Have a look over source of information on iontophoresis as an attached file with this post.
You may use Histamine, Renotin, Mecholyl, Iodide ions for vasodilatation. Have a look over source of information on iontophoresis as an attached file with this post.