People harbor onboard ingredients that offer the following (non inclusive list)
Healing
Rejuvenation
Life extension
REE
And an intoxicating effect
As well as addiction, and an ever increasing hunger and rising tolerance.
All fruits have belly buttons. All plants have medicinal and intoxicating effects, dosage and preparation will define which pole.
Just like there are smokers, alcoholics, sugar heads, heroin addicts, there are the same for the blood and other life giving elixirs of humans. The younger the closer to the purest source from which it departed from to arrive here.