I try and donate blood as frequently as possible through the American Red Cross
The ARC is truly a humanitarian organisation. I  would prefer  to donate and volunteer my time if I have the chance
They do such great things.  Unfortunately, I'm unable to donate my time, but I would love to do that too
The good thing about ARC is that they are affiliated to the   International Federation of Red Cross and Red Crescent Societies and the United States movement to the International Red Cross and Red Crescent Movement so I'm sure every or anything donated will be judiciously used 
That is my hope.  I hater hearing about charities that only donat a dime out of every dollar to the causes they are supposed to be supporting.
The ARC does other stuff as well such as services to the public and development initiatives and programs
I have never had a bad experience with them while giving blood.  It's really the least that I could do.
D.C. on May 21, 1881, by Clara Barton. She became its first president. Barton organized a meeting on May 12 of that year at the house of Senator Omar D. Conger (R, MI). Fifteen people were present in this meeting, including Barton, Conger and Representative William Lawrence (R, OH) (who became the first vice president). The first local chapter was established in 1881 at the English Evangelical Lutheran Church of Dansville, New York.
Jane Delano (1862–1919) founded the American
with Orlando's gay community. In a feature story and interview with Myspace Music the week of the release, Lynn said "I'm a gay man, so I can't donate blood, even to save other gay men who are dying because they are losing their own blood, so it felt very much like I needed to do something other than sit on my hands. I wrote the song about feeling like I didn't have a safe place in the world; This feeling like I'm a man without a country