I have been taking arginine ,2 to 3 grams, for about 3 weeks now. I have started to noticed a feeling of indigestion/ chest pain. I was doing a set of machine benches. My heart felt like it was going to come out of my throat because it was beating so hard. I originally thought that it was the the tongkat ali that I was taking. But now, doing some research on arginine, I have found other people complaining about this. I like the pump and the energy that gives with the combo of arginine and the herb, but it is not worth having something go wrong with my heart. My blood pressure has went down a lot as well. Oh , well. Live and learn.
Thinking back now, about 10 years ago I began taking a popular NO supplement, and it did the same thing. Brain fart!