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Die Hard improves the foundation of erection, increases sperm production and motility, and boosts testosterone levels. In order to achieve the swelling of the "corpora cavernosa" (penile engorgement), a "relaxing factor from the endothelium" is required. To activate the endothelial factor, there must be a sufficient amount of nitric oxide. Nitric oxide is produced from L-arginine (with the help of free intracellular calcium) and provides relaxation of the corpora cavernosa, thus leading to an erection. Factors such as age and bad habits reduce the presence of sufficient arginine. Die Hard contains a higher dose of arginine and calcium than any competitor.
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