TIENS is a company that markets products through a network marketing system. In network marketing companies, products are typically marketed through distributors and their associated downlines, and as the number of participants in the downline increases, the income of those in the upper tiers also grows. The evaluation of such systems from an Islamic legal (fiqh) perspective is important. Even if the products being marketed are halal or have halal certification, it does not change the fundamental concern if the system itself is problematic from a fiqh standpoint.
It is essential to examine whether the system itself is problematic or permissible, in addition to whether the products are halal. The evaluation of health-related products is a matter that should be left to medical professionals and experts. If there are products that are religiously impermissible, attention should be paid to whether there is an element of necessity and whether alternatives are available. Taking these factors into consideration is the most appropriate approach.