A stroke occurs when a blood clot blocks a blood vessel or artery, or when a blood vessel breaks and interrupts blood flow to an and bleeding occurs into an area of the brain. Every stroke is different.
ETA Chlorophyll works on the Liver and probably works a little. No it really doesn't, you are not a plant. Tea will oxygenate the blood. No it won't Also don't do as someone else said and drink liquid oxygen, that's really not a good idea.
RS: If you need supplemental oxygen, not getting enough oxygen to raise your blood levels of oxygen to an appropriate level can have very serious long term effects. Too little oxygen causes the blood vessels in the lungs to constrict making it more difficult for the heart to pump blood through the lungs.