I don't really think it's about longer life as much as it's about aging gracefully and living healthy for your complete life time by avoiding Alzheimer's and other dehabilitating diseases. I have been taking RESVERATROL (from Biotivia) for years. I swear by it. Great product. They also have their own version of Niagen called Mitotrans it's sustainable NAD+ and not like niagen which is a precursor to NAD+ which actually is vitamin B3. Only problem with Biotivias Mitotrans is it costs over $400 for one months supply.