Brand, 37, who has been sober for over 10 years after battling heroin addiction, said he still feels guilty about not helping the late soul singer get clean when he first realised she was struggling with addiction, reported Contactmusic.
"I got clean at the age of 27, the age Amy was when she died. Amy's death was a paradoxical unsurprising shock. I felt like I could have done something to help -- to give her the chance I had.
"When she died, it was this feeling of, 'Agh, I knew that was going to happen.' And I had this flickering sense that I should have done something about that. I feel a bit guilty that there was nothing I did," he said.
The "Forgetting Sarah Marshall" star hopes to raise awareness about the way society treats drug addicts and has made a new BBC3 documentary, 'Russell Brand: From Addiction To Recovery'.