Solaray's Horsetail 400 mg supplement differentiates itself by explicitly mentioning 'Horsetail aerial extract, Form: Silica, Quantity: 400mg' in its ingredients, alongside 100mg of regular Horsetail. This standardization for silica is a crucial advantage, as silica is the primary bioactive component responsible for horsetail's benefits on hair, nails, bones, and skin. Knowing the specific silica content allows for a more precise and reliable dosage. While its price per serving is higher than some non-standardized options, this is often justified by the quality and guaranteed potency of an extract. The moderate review count suggests a smaller but likely satisfied user base.