Everything has a chemical compound, I just don’t get why it would be impossible to make real blood at home using chemicals.
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In theory your blood is a mixture of chemical compounds, but they are not all simple compounds like water or gasoline etc.
You blood contains a very large number of different things.
Among the most important parts of that are your red blood cells that carry oxygen though your body. You need all the stuff in your blood to survive, but the lack of oxygen will kill you the quickest.
Of course human cells too are just an arrangement of atoms into molecules and molecules into large structures.
A water molecule has three atoms 2 hydrogen and one oxygen.
There are trillions of atoms making up millions of molecules that make up a human cell. (Google gives 300 Trillion atoms and 42 million molecules for an average human cell).
You can’t easily synthesize that.
You can make human blood cells if you use human bone marrow, that is how your body does it.
Unfortunately you can’t just use anyone’s bone marrow to make blood cells.
Your body has an immune system that is very good at destroying things that don’t belong inside your body, that includes foreign red blood cells.
You need blood cells that are either your own or close enough to your own to fool your immune system to get away with it.
This is non-trivial.
People are working on it, but right now the easiest way to get blood that will work in your veins is to let your own body make it.
And as sattes above most of that is just to get blood that carries oxygen. You blood serves many other functions too and carries a ton of other stuff. You can live without those for a little while, but you die very quickly without oxygen. However to completely replace blood long term with a synthetic alternative you would need to take over all functions, this would be hard because there are so many things and we can’t be sure we know them all. evolution does not simply create one thing for one function but usually makes anything serve as many functions as possible and we only ever figure out that something was had a secondary or tertiary function when it goes wrong.
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