SAG: S-ACETYL GLUTATHIONE

What SAG Is

SAG (S-acetyl glutathione) is a stabilized form of glutathione, the tripeptide your liver uses as its primary intracellular antioxidant. The acetyl group attached to the sulfur position is what makes the difference. Plain oral glutathione is broken apart by gut enzymes (gamma-glutamyltransferase and others) before it ever reaches the bloodstream, so its absolute oral bioavailability is below 1 percent in standard formulations¹. The acetyl group on SAG protects the molecule until it crosses the gut wall, at which point intracellular esterases cleave it back into intact glutathione.

For the longer story, see What Is SAG.

Why Glutathione Matters

Glutathione is concentrated in the liver more than in any other tissue, and the liver is also where most ethanol metabolism happens. The liver burns through GSH as it neutralizes acetaldehyde and the reactive oxygen species generated by alcohol breakdown². When GSH stores drop, oxidative damage rises proportionally. This is the part of "feeling rough the next day" that has nothing to do with sleep deprivation or dehydration -- it is just biochemistry running out of antioxidant material.

For the full role of glutathione in the liver, see Glutathione -- The Master Antioxidant.

The Bioavailability Problem and Why SAG Solves It

The reason supplementing with regular oral glutathione has historically disappointed is straightforward: the molecule does not survive the gut intact. SAG was developed specifically to address this. The acetylated form is stable through gastric and intestinal pH, crosses the enterocyte membrane, and is then deacetylated to liberate intact glutathione inside the cell. (this took me longer to internalize than the DHM mechanism, honestly, because the precursor-vs-intact distinction is not obvious until you read the gut absorption papers.)

For the cellular delivery mechanics, see SAG Intracellular Delivery.

ROS and Oxidative Stress

Alcohol metabolism generates reactive oxygen species through several pathways at once: the ADH/ALDH oxidation chain produces NADH that destabilizes mitochondrial redox balance, the CYP2E1 microsomal pathway directly generates ROS intermediates, and the catalase pathway adds a smaller contribution⁴. Glutathione is the cell's primary defense against the resulting oxidative load.

For the full ROS cascade, see ROS and Oxidative Stress.

Synergy with DHM

DHM and SAG are paired in the H180 formula because they address different parts of the same cascade. DHM accelerates ethanol and acetaldehyde clearance at the enzyme level. SAG keeps the antioxidant pool topped up so the cleanup that happens during clearance produces less collateral damage. The two ingredients work upstream and downstream of the same problem, in the comparative bioavailability data we have at least.

For the full synergy story, see SAG and DHM -- The Synergy.

Where the Claims Land

SAG sits at 75mg per serving because that is teh dose where the GSH-restoration math closes -- enough to meaningfully push intracellular GSH but not so much that it pushes out the ratios with DHM and fulvic acid in the rest of the formula³.