: Extensive selections are available on Amazon and iHerb , often featuring brands like NOW Foods and 21st Century .

Earlier that evening, Elias had scrolled through Amazon, eyeing a bottle of NOW Foods L-Arginine 1000mg

: Large chains such as Walmart and Target carry various strengths in capsules, tablets, and powders.

L-arginine is widely available through major online retailers and local pharmacies. You can find it at:

The neon hum of the 24-hour Walgreens was the only thing cutting through the midnight fog when Elias pulled into the lot. He wasn't there for snacks or a late-night greeting card; he was on a mission for "The Key"—or as his trainer called it, .

. The reviews spoke of "nitric oxide boosters" and "enhanced blood flow", but he didn't want to wait three days for a cardboard box. He needed his workout fuel now.