From my layman's understanding, in the US, it is almost impossible to get FDA approval for drugs that "improve" or "enhance" human biology.
The tl;dr is if you invented a drug tomorrow that stopped human aging, you wouldn't be able to get FDA approval to sell it.
This sadly means that research into how to improve human life and potential are very limited.
An alternative explanation is that it may just be super hard to make into a useful pill or convenient injectable, limiting commercial viability! Most drug companies aren't going to dumping $ into a chemical that may cure a disease but has no practical way to get it to the target site!
The tl;dr is if you invented a drug tomorrow that stopped human aging, you wouldn't be able to get FDA approval to sell it.
This sadly means that research into how to improve human life and potential are very limited.
An alternative explanation is that it may just be super hard to make into a useful pill or convenient injectable, limiting commercial viability! Most drug companies aren't going to dumping $ into a chemical that may cure a disease but has no practical way to get it to the target site!