Supplementing with quality silica like Swanson Bamboo Extract is a great way to ensure healthy intake and nourish the vital tissues that depend on this essential nutrient. You probably already know horsetail grass is a great source of silica, but it's nothing compared to bamboo. While horsetail is about 7% silica by weight, bamboo extract boasts an average 70% silica content! The average healthy adult maintains approximately 20 grams of silica within the body, but that level tends to drop with age due to reduced assimilation and other factors.