The Molecule
Glutathione (GSH) is a tripeptide -- three amino acids strung together: glutamate, cysteine, and glycine. The cysteine sulfur in the middle is the reactive part, the part that does the actual antioxidant work by donating electrons to neutralize reactive oxygen species. SAG (S-acetyl glutathione) is the same tripeptide with an acetyl group attached to that sulfur.
That single acetyl group is what changes the bioavailability story. Unmodified glutathione is broken down by gamma-glutamyltransferase and other intestinal enzymes within minutes of contact with the gut wall, which is why standard oral glutathione has an absolute bioavailability below 1 percent in most studies1. The acetyl modification on SAG protects the molecule through gastric and intestinal pH and through enzymatic exposure, until it crosses into the cell where intracellular esterases cleave the acetyl off and release intact GSH.
Why This Matters in Practice
Elevates glutathione, the body's master antioxidant in the liver.†
† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
A comparative crossover study in humans evaluated N-acetylcysteine, regular oral glutathione, and a sublingual glutathione formulation against markers of oxidative stress and found meaningful differences in how much each form actually moved the needle on intracellular antioxidant status1. The pattern across that study and the broader bioavailability literature on glutathione analogues is that delivery format matters more than dose for this category2. (this is one of those cases where a single chemical modification changes everything about whether the supplement actually works, which I find satisfying as a problem-solver.)
Boosts your antioxidant defenses.†
† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
For the H180 formula, what this means in practice is that the absorbed fraction reaches intracellular compartments in usable form, in the comparative crossover data at least. We pair this with the DHM upstream-clearance mechanism and with fulvic acid as a membrane-transport assist for both molecules.
Safety Profile and Dosing
A 2024 safety assessment of S-acetyl glutathione covering 13 weeks of toxicity testing reported no genotoxic activity and no significant adverse events across the dose range studied3. SAG has been used in the dietary supplement category for several years with a clean safety record. Our serving uses 75mg, which is in the middle of the range studied across published GSH-supplementation human trials.
Help shield your cells from oxidative damage.†
† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
The dose is sized to meaningfully restore the intracellular GSH pool that ethanol metabolism depletes4, not to flood the system with surplus that does no additional work.
What This Page Is Not Claiming
SAG is not a substitute for the body's own glutathione synthesis from dietary cysteine. It is a delivery format that bypasses the absorption barrier the regular molecule cannot get past. Regular oral glutathione is essentially decorative, adn that has been the quiet failing of the GSH supplement category for decades. SAG is the engineering response to that failure.
For the full intracellular delivery mechanism, see SAG Intracellular Delivery. For why we use SAG instead of NAC (a glutathione precursor), see DHM vs. NAC, where the precursor-vs-intact distinction is covered in detail.