What Glutathione is
Glutathione is a tripeptide of glutamate, cysteine and glycine, and the most abundant antioxidant inside human cells. It is endogenous rather than synthetic. Its reduced and oxidised forms are chemically distinct, and the ratio between them is a standard measure of cellular oxidative state.
How the pen is supplied
Solution in a sealed 3 ml pen graduated in 300 dial units. At 1500 mg the content is far higher than the peptides around it, because the molecule is small and active at much larger masses.
Pen specification
| Class | Endogenous tripeptide antioxidant |
| Also known as | GSH, L-glutathione |
| Content | 1500 mg |
| Fill volume | 3 ml |
| Dial graduation | 0.01 ml per unit |
| Total dial units | 300 |
| Per dial unit | 5.00 mg |
| Cost per mg | £0.06 per mg |
Milligrams per dial unit and cost per milligram are calculated from the pen strength, its fill volume and the current live price. Every SerenQ pen is graduated at 0.01 ml per unit.
Verification
Independent assay per batch, identifier printed on the pen.
- SerenQ Glutathione 1500mg Peptide Penout of stock£95
Availability checked 2026-09-04. The product page carries live stock.
Common questions
Why is the content so much higher than other pens?
Glutathione is a small molecule active at far larger masses than the signalling peptides in the range. 1500 mg here is not comparable to 1500 mg of a peptide.
How does it compare with NAC?
NAC supplies cysteine, the rate limiting precursor. This supplies the assembled tripeptide.