Idea for how to use blood types

[Frank_Stein]

So, you know how everyone has blood types, and it doesn't mean anything? You know how we have blood transfusion possible? 

Well, what if, when you received a blood transfusion, it acted as a cure all for damage types?

There's two ways it could work

1. Semi-Realistic: Receiving a correct donor to patient combo transfusion results in all damage healing during the transfusion
   
2. More gamelike: Each blood type heals a specific type of damage. So if you wanted to heal brute you do AB but if you wanted to heal Oxygen you did O+
   
   With the second system, maybe picking a certain blood type gives you an overall boost in defense against the damage type it would heal in a transfusion
   

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Another idea for the second system:

- A chem recipe that involves mixing all the blood types together to create some kind of wonder medicine that greatly boosted your health