Please take note that Immunocal® is not a drug. It is extracted exclusively from milk produced without antibiotics and steroids. Therefore, there will not be any withdrawal symptoms or craving unlike addiction. GSH is produced intra-cellularly by our body. We are born with this miraculous substance. Hence, your GSH will only drop to your body’s original level if you stop taking Immunocal®. It has been shown in the Lancet, a renowned British medical journal, that GSH level decreases precipitously as we age. It is ideal if we can optimize our GSH level at all times to maintain good health and quality of life.