Dietary supplements significantly boost stamina during high-intensity exercise, research from the University of Exeter has shown.

Participants were randomly assigned to take either a blackcurrant cordial placebo drink or the genuine supplement, which was Ark 1 from Arkworld International Limited - which contains the L-arginine amino acid which enhances the production of nitric oxide in the body.
The results showed that the supplement:
Improves severe-intensity exercise endurance by 20percent
Significantly reduces systolic blood pressure
Reduces the oxygen cost of exercise
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Source-ANI