EZC Pak 5-Day Immune System Booster Echinacea Vitamin C & D Zinc, Pack of 2

Customers find the supplement effective at boosting their immune system. However, experiences with side effects are mixed - while some report feeling better, others mention severe reactions including nausea and abdominal pain. Similarly, opinions on value for money are divided, with some finding it worth the price while others say it's not worth the cost.