I have been taking it daily for about 4 years — I take a powder that I mix with water..5000mg of L’Arginine & it includes 1000mg of L’Citruline which I believe your body naturally converts to L’Arginine .. it is supposed to help your blood vessels relax and expand. I have found I do better with the brand that includes the L’Citruline.
I had a great acupuncturist you I felt was really helpful, but he has moved and the next one I tried is not as effective.
My recent heart cath was very similar to my first one 4 or 5 years ago… pressures in the high 40s or low 50s. The heart doctor who did it said “very consistent” no significant change. I think the supplement helps me.