YES....GELFOAM!!!! OP and former nurse, my Dad on blood thinners died 2 days after bumping his head. He was taking either warfarin or coumidin, both are poison. Thanks for the suggestion of first aid for them. People: get your family off this stuff! Doctors do not fully realize what seniors may already do to thin their blood naturally, like alcohol and greens. Blood tests may only be checked bi-annually, so any weight loss or cold season temp change or diet change make blood even thinner.