beets increase nitric oxide levels. apparently the nitrates in beets do a better job of this than the l citrulline in watermellons.
Would you argue for a different explanation. That is would you say that beets/grapes/sour cherries/pine bark extract increase performance via a different pathway than nitric oxide?
“Similarly, the polyphenols in grapes, cherries and pine bark extract helped protect nitrate from degradation in the body…”
They don't produce nitric acid.
The other items reviewed perform other functions that don't impact the isolated function of nitric acid.