However, most of the stuff we write about has been proven to a significant degree whether we can cite chapter & verse, or not.
However, it's great to just put stuff on a high shelf and wait and see what falls off as conclusively proven at some future point.
In terms of the blood/youth issue--that's been documented from a variety of sources--some with pictures of the aged one and the youth providing the blood.
New (?) discoveries are made daily. I read an article, here I believe, about Metformin, one of the old drugs for diabetes.
It has been discovered as a possible anti-aging drug. That I believe, my hubby has been taking it for 25 years and I can see the effects on him.