the only harm they can do is by releasing reactive oxygen species which can cause harm to your body, but just take a good anti-oxidant supplement post workout and theres no need to worry. I was taking primaforce nitro-charge, good and affordable NO product, but i also take
xtend which has citrulline malate(similar to arginine), so i cut out the primaforce to save money. One more not, tablets are not effective as powders so stick to powder form NO product's.
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