This product is a straightforward offering of 420mg of Freeze-Dried Stinging Nettle per serving. Freeze-drying is a method often used to help preserve the natural constituents of the herb. As a single-ingredient product, it provides a focused approach to nettle supplementation. The inclusion of a minimal amount of Calcium is likely incidental or from excipients.
It's an excellent value product, offering a moderate dose of nettle at a very low price per serving. For general anti-inflammatory support, nettle can contribute, but it won't offer the broad-spectrum effects of multi-ingredient blends. For testosterone support, the lack of specification regarding nettle leaf or root means its direct efficacy for this goal is less certain, as root extract is typically preferred.