It's actually complementary, aging has many factors. Heavy water is supposed to make harder for free radicals to do damage in the first place. Sirtuins should

It's actually complementary, aging has many factors. Heavy water is supposed to make harder for free radicals to do damage in the first place. Sirtuins should help with switching on repair mechanisms after damage is done. And then there are telomeres, our natural kill-switch. There is another article, linked from the sirtuins one, about a possible way to slow down telomeres shortening: http://www.newscientist.com/article/dn16035-elixir-of-youth-drug-could-fight-hiv-and-ageing.html http://www.newscientist.com/article/dn16035-elixir-of-youth-... BTW All three anti-aging approaches have companies working on the products to commercialize the research (Sirtris was recently bought by GlaxoSmithKline for $720M).