Source Naturals Selenium 200 mcg features L-Selenomethionine, an organic and highly bioavailable form of selenium that is well-absorbed and retained, making it very effective for supporting immunity, general health, anti-aging, skin health, and metabolism. The 200 mcg dosage aligns with common recommendations for optimal selenium intake for adults. While Source Naturals is a reputable brand, online reviews and market comparisons indicate that there are other high-quality L-Selenomethionine 200 mcg supplements available at a more competitive price per serving. Therefore, while the product delivers on quality and efficacy, it doesn't stand out in terms of cost-effectiveness, which is a key consideration for many consumers.