Damn that shit is expensive. No I wouldn't personally recommend it.
Here are some much cheaper things that will cover what is in that "n2guard" and more
First, a multi vitamin. Alot of people say these don't do shit, but look at the ingredient list of n2guard. It pretty much is a multi with a few extra bells and whistles.
Orange Triad is the bee's fucking knee's. Seriously
acetyl l-carnitine, this is shown to improve brain function and some say weight loss. BUY IN FREE POWDER FORM. So much cheaper in the long run. Also buy a jewelry scale, this can also be used to weight other things you may buy by the gram. Hint hint
NAC or N-Acetyl Cysteine, this does a shit ton of different things. Most use it for antioxidant, liver support and it's ability to lower cholesterol. But it does oh so much more. And powder form is cheaper. 600mg-1200mg is safe. 600mg off cycle 1200mg on cycle, if you are taking an oral up that shit to 1800mg
CoQ10 or the better version [FONT=Verdana, Tahoma, Calibri, Geneva, sans-serif]ubiquino. This will help your heart, liver and kidney. Those mostly it's vied as a heart thing. Blood pressure and the works. This one is pricey though.[/FONT]
Then of course hawthorn berry, that is also for blood pressure.
Honestly you could simply buy the products I listen for cheap than n2guard and they will last longer too. Then again, I am biased towards the whole ntbm product line. Please do look into the claims I have made. Some quick google searches will show you more.
Best of luck!