Here are few more bits from old thread:
Powerful Amino Acid L-Citrulline Proven to Naturally Restore Erectile Function | Smart Publications |Smart Publications

Few more comments:

" I've been some more reading, and I cant find consensus- but it seems that most of guys are using citrulline malate (2-3gr daily)+ antioxidant+ NO donor- some folks suggest beet root as it provides both. Side note- it seems that beet root combined with viagra can cause serious drop in blood pressure."


"I've supplemented L-Citrulline orally for a long time at 5-10grams/day.
On me It does nothing taken alone or combined with a PDE5i.
It does something instead when combined with an alpha-1-blocker.
I've supplemented even more than 10grams/day sometimes, still combined with an A1B, and I've had good results.
Alpha-1-blockers augment any NO enhancer effect including PDE5i effects.
PDE5i non responders are more likely to respond adding alpha-1-blockers than NO's substrates."

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This was post made by our pal FPR:
I can speak directly to it. I run a cocktail of the following, pre-workout:

1. 7,500mg of Arginine AKG lemon flavored powder from Swanson
2. 6,000mg of Citrulline Malate powder from Primaforce (get the malate, the regular L-citrulline sucks)
3. 2,000mg of L-ornithine HCL

I can tell you that it absolutely, without a doubt ramps up erectile function. You even get the classic warm ears like what you get after taking a PDE5 inhibitor.

Effects are best and most consistent after a few days of use, but overall, this is the next best thing to a PDE5 inhibitor. Add horny goat weed for intensified effects.

And the pumps are sick.