Article: What Foods Boost Nitric Oxide?

I was under the impression arginine was ineffective for increased NO production when supplemented orally instead of intravenously.
 
When you entitle the article with "foods", why doesn't it elaborate more into varieties of foods increasing NO instead of just hinting on beets?
 
If I were to eat actual beetroot rather than buying beetroot extract how much would I have to eat to get the equivalent to the 500mg beet extract?
 
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