"Cultured Biologix" appears to be a legitimate company with positive reviews. The product "Dr. Root 3-1-1 Microbial Rooting Aid" has received a 100% 5-star rating on Amazon. On GrowDiaries, the overall rating for "Cultured Biologix" is 4.7/5 based on user reviews. Users have mentioned that they use and like the products. However, it's always recommended to do thorough research and read reviews before purchasing from any company.