NO is a vasodilator that increases the flow of blood and oxygen to the muscles, thereby boosting strength and endurance, and one 70ml shot, according to Beet-It, delivers 400mg of natural dietary nitrate. The 60g bar is said to deliver the same amount of nitrate in a moist, chewable form. Sainsburys, Holland & Barrett, Waitrose and Amazon sell the shots for £1.49 each, and the bars are priced for £29 per pack of 15.

www.beet-it.com

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