Neen leaves have antihistamine effects and is said to lower Blood Pressure.I am not able to see any study to support that.And Theanine is used to improve cognitive function and there is some evidence to support this hypothesis.There is no evidence that Theanine either raises or lowers Blood Pressure.So there is no interaction if you take these together.Consult your Doctor if you have elevated BP
Answered 11/17/2021
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