Various other mechanisms can improve how effective your body is at recycling cells, encouraging autophagy and filtering things in the blood. There are a whole suite of various supplements and medicines that work in this system.
As undead, though, vampires no longer produce new living blood, so require fresh blood of the living to restore lost function. Or something.
I guess that'd make Bryan Johnson the ultimate thrall?
20170113 https://news.ycombinator.com/item?id=13395478 Questionable “Young Blood” Transfusions Offered in U.S. As Anti-Aging Remedy
20170421 https://news.ycombinator.com/item?id=14163395#14164470 Mice treated with a protein from umbilical cord plasma showed improved memory
20170521 https://www.youtube.com/watch?v=hBA0AH-LSbo Silicon Valley S04E05 The Blood Boy
20170602 https://news.ycombinator.com/item?id=14470314 An anti-ageing startup is offering transfusions of blood from young people
20170825 https://news.ycombinator.com/item?id=15102304 Some wealthy people are injecting blood from teenagers to gain ‘immortality’
20180120 https://news.ycombinator.com/item?id=16194413 Clinical trial finds blood-plasma infusions for Alzheimer’s safe, promising
20180907 https://news.ycombinator.com/item?id=17929462 Startups Flock to Turn Young Blood into an Elixir of Youth
20190117 https://news.ycombinator.com/item?id=18929943 Blood transfusion startup Ambrosia is now up and running
20190221 https://news.ycombinator.com/item?id=19213938 FDA warning brings young-blood transfusion company to a halt
20191108 https://news.ycombinator.com/item?id=21484203 Ambrosia, the Young Blood Transfusion Startup, Is Quietly Back in Business (0 comments)
20230817 https://news.ycombinator.com/item?id=37163684#37164170 Older mouse brains rejuvenated by protein found in young blood
Or indeed daylight
I was going to suggest some other vampire remedies, but I was worried Palantir will scan this and tell ICE.
Can you recall well what you did ten years ago to the day? How much is a vampire is going to accurately recall from a hundred years ago?
At best, the vampire has bragging rights like "I hung out with Gandhi."
We'd need some evidence the vampire has super-recall AND is somehow trustworthy enough to not change the story depending on motivations of the day.
You might want to read up on chaperone-mediated autophagy, and how that declines over time. There's a point to be made that yes, in old age we collect things in our blood that don't belong.
It might not be solvable through dilution, but it's not like we get a full blood change every 5K miles either.
"Garlic"