The XVIIth Karmapa has asked that Hayagriva mantras be accumulated, among others. Although it is not explicitly stated, the assumption is that he refers to Hrih Benza Trodha Hayagriva Hulu Hulu Hung Phat. If this is incorrect, someone please very quickly correct me.
I am also going to include a mantra associated with Ta Chag Khyung Sum, Hayagriva, Vajrapani, Garuda, as expressed in the "Molten Drop of Iron" branch of Kyabje Dudjom Rinpoche, Jigdrel Yeshe Dorje's New Treasure of the Extremely Wrathful Hayagriva. Because somebody is sure to comment or complain, I want to explain that I have received the associated empowerment for this three times, including once from Dudjom Rinpoche himself, and I clearly understand what is involved in making it public. There is more than one mantra associated with this particular practice. The mantra below is extremely powerful and efficacious in overcoming injuries, infections, and the threat of epidemic diseases -- a very real reflection of what is happening in Tibet right now. Dudjom Rinpoche is an ocean of compassion. It is my belief that he would be encouraging its use in the present circumstance. Om Benzra Krodha Haya Griwa Benzrapanri Drom Garuda Yaksha Raksha Hung Phat.
If you want to criticize, go ahead and criticize. If your motivation is to criticize or find fault then it is my pleasure to oblige you. I have many faults, and they are not difficult to find. However, if your motivation is to do something to help the people who have been made to suffer by the recent earthquake in Tibet, the mantra I have published above has such power.
Of this you may rest assured.