Hello Joan, thank you for your excellent 5-star review and wonderful feedback about our Bio Cultures Probiotic. We're absolutely delighted to hear that you've been taking our probiotic supplement for more than 4 years and that you've found it to be really good throughout this extended period. We're grateful for your long-term loyalty and that you took the time to share your positive experience with our Bio Cultures Complex, as it reflects our commitment to delivering high-quality, effective probiotic supplements that our customers can trust and rely on for their ongoing digestive health and wellness goals. Regards, VitaBright.