I purchased a bottle of EPONOX by Xero Limits a nearly two months ago at the Vitamin Shoppe ($42.99). My use of NO products is limited but this, like few other supplements lived up to it's claims:
-Induced some heavy pumps.
-Muscles are getting bigger/more vascular.
-Endurance was increased starting the first time I took it.
It's recommended to take it 3 times a day. This was kind of a bummer but you have those "garden-hose" veins looking good all day!
It has the daily recommended amount of all your B-Vitamins.
Here's a breakdown of the ingredients I wrote up:
Nitric Oxide Co-Factors:
-Arginine AKG:Amino Acid that plays important role in nutrient delivery/protein synthesis)
-Arginine Ethyl Ester: Same thing except with an ester attached, making the ergogenic effects more pronounced.
-L-Arginine: Increases vasodilaton. Converts such products such as creatine to glucose/glycogen if needed.
-Gynostemma Pentaphyllum: Antioxidant/adatogenic, regulates blood pressure, lowers cholesterol, and increases endurance.
-Cnidium Monnieri: Increases N.O. levels and boosts circulation.
EPO Blood Building Technology:
Arachidonic Acid: Essential fatty acid, helps muscle grow/repair, aids neurological health.
Echinacea purpurea:Anti-depressant effects by stimulating L-Dopa.
Portulaca oleracea:Contains more Omega-3 fatty acids than any other leafy plant.

Here's the vitamin/mineral info:
Niacin 75mg 375%
Vitamin B6(as Pyridoxine HCL And Pyridoxine 5-Phosphate) 75mg 3,750%
Folate(as 700mcg Folic Acid And 100mcg Vasofolate (Methyltetrahydrofolate)) 800mcg 200%
Vitamin B12(Methylcobalamin. Cyanocobalamin, Dibencozide) 100mcg 1,667%
Iron(as Ferrous Fumarate) 3mg 17%

This doesn't give the extreme pumped up feeling you get with other stimulant packed N.O. products. Endurance is the most noticeable physical benefit. The type of B6 is the more form your body converts it too, making the effects way better. Overall this is a good N.O. with a limited number of stims. YOU STAY VASCULAR!