There have been no reports of toxicity associated with overdosing on Immunocal.
Your body cannot overproduce glutathione. The use of undenatured cysteine and intracellular glutathione production are a tightly regulated process through the activity of the enzyme gamma-glutamylcysteine synthetase. Such ability of the cells to self-regulate glutathione production greatly minimizes the possibility of overdose.
For additional information read FAQ #5 Who should not take Immunocal?