S-Acetyl Glutathione
The acetyl-protected form of the body’s most abundant intracellular antioxidant — engineered to survive GI degradation and deliver intact, reduced glutathione directly inside your cells.
Primacy Research
What S-Acetyl Glutathione Does For You
Survives GI Degradation Intact
The S-acetyl group caps the reactive thiol, making the molecule resistant to gastric acid oxidation and intestinal GGT cleavage — delivering intact glutathione directly inside cells where intracellular esterases release free reduced GSH.
Master Antioxidant Replenishment
Glutathione is the terminal recycler in the antioxidant network — regenerating both Vitamin C and Vitamin E, powering GPx for H₂O₂ clearance, and driving Phase II detoxification. Every other antioxidant eventually depends on it.
35% Blood GSH Increase (Oral GSH Evidence)
The Richie et al. RCT (n=54) demonstrated 35% increases in whole blood glutathione and doubled NK cell cytotoxicity with oral glutathione supplementation — establishing that oral delivery meaningfully raises systemic GSH levels.
Timed for Overnight Detoxification
The glymphatic system clears ~60% more metabolic waste during sleep — and the downstream Phase II conjugation pathway runs on glutathione. RESET delivers 300 mg SAG precisely when the brain’s cleanup machinery is most active.
Dual-Pathway Pool Replenishment
S-Acetyl Glutathione delivers preformed GSH directly, while RESET’s 3,000 mg Glycine fuels endogenous GSH synthesis — two independent mechanisms feeding the same critical antioxidant pool for maximum overnight replenishment.
Your Master Antioxidant Is Depleting Every Decade
Glutathione is the most abundant intracellular antioxidant in the human body — present at 1–10 mM concentrations in every cell. It powers detoxification, recycles vitamins C and E, and protects mitochondrial DNA. Yet levels decline ~10–15% per decade after age 20, and most oral glutathione supplements are destroyed before they ever reach your cells.
Age-Related GSH Decline
Intracellular glutathione drops 10–15% per decade after age 20. By 60, you may have lost 30–50% of your baseline GSH — driven by reduced synthesis enzyme expression, increased oxidative burden, and declining sulfur amino acid intake.
The Oral Bioavailability Problem
Standard reduced glutathione (GSH) is oxidized by gastric acid and cleaved by gamma-glutamyltranspeptidase (GGT) at the intestinal brush border — broken into constituent amino acids before absorption. Your body gets fragments, not functional antioxidant.
Overnight Detox Bottleneck
During deep sleep, the glymphatic system increases metabolic waste clearance by ~60%. But the downstream Phase II conjugation pathway that processes this waste runs on glutathione. If the pool is depleted, the detox pipeline backs up overnight.
How S-Acetyl Glutathione Works
The acetyl group on the sulfur atom shields the reactive thiol (-SH) from oxidation and enzymatic cleavage — allowing the intact glutathione molecule to survive the GI tract and deliver directly into cells, where intracellular esterases release free reduced GSH.
Acetyl Protection Through GI Transit
The S-acetyl group caps the reactive sulfhydryl (-SH), making the molecule resistant to oxidation in gastric acid (pH 1.2–2.0) and resistant to cleavage by GGT at the intestinal brush border. The lipophilic acetyl group also enhances membrane permeability for absorption.
Intracellular Deacetylation
Once absorbed into cells, cytoplasmic thioesterases and acylases cleave the acetyl group, releasing free reduced glutathione (GSH) with its reactive -SH group directly inside the intracellular compartment — bypassing the rate-limited de novo synthesis pathway entirely.
Glutathione Peroxidase (GPx) Activation
Free GSH serves as the substrate for GPx enzymes (with selenium as cofactor): 2 GSH + H₂O₂ → GSSG + 2 H₂O. This is the primary enzymatic defense against hydrogen peroxide — more catalytically important than catalase in most tissues. GPx4 specifically protects mitochondrial membranes.
Phase II Conjugation & Detoxification
Glutathione S-transferases (GSTs) conjugate GSH to electrophilic compounds — heavy metals, lipid peroxides, drug metabolites, and environmental toxins. Conjugates are exported via MRP transporters for biliary and renal excretion. This is the liver’s primary overnight detoxification pathway.
Antioxidant Network Terminal Recycler
GSH sits at the hub of the antioxidant recycling network: Vitamin E is recycled by Vitamin C; Vitamin C (dehydroascorbate) is recycled by GSH via dehydroascorbate reductase; oxidized glutathione (GSSG) is recycled by glutathione reductase + NADPH. Glutathione is the terminal node — the last line of defense.
What the Research Shows
Research on oral glutathione and the acetylated form demonstrates meaningful increases in blood GSH, enhanced immune function, and superior bioavailability over reduced GSH.
Richie et al. (2015). European Journal of Nutrition, 54(2):251–263. Healthy adults, 250 or 1,000 mg/day reduced GSH for 6 months. Even the lower dose (250 mg) produced significant increases — establishing oral glutathione as effective. Important: This study used oral reduced glutathione (GSH), not S-Acetyl Glutathione. S-Acetyl Glutathione is expected to perform comparably or better due to its acetyl group protecting against GI degradation, but direct clinical comparison data is limited.
Cacciatore et al. (2010). Biochemical Pharmacology, 79(8):1066–1075. Demonstrated S-acetyl glutathione resists breakdown by peptidases and GGT in the GI tract; intracellular thioesterases cleave the acetyl group, releasing free reduced GSH.
Sekhar et al. (2011). American Journal of Clinical Nutrition, 94(3):847–853. Demonstrated glycine as a co-rate-limiting precursor for GSH synthesis in aging — directly relevant to RESET’s 3,000 mg glycine + 300 mg SAG dual-pathway design.
Your Nightly Dose in RESET
Why this dose works: Richie et al. showed that even 250 mg/day of the less bioavailable reduced form produced statistically significant increases in blood GSH (+17%) and doubled NK cell cytotoxicity. At 300 mg of the acetylated form — which survives GI degradation intact and delivers directly into cells — RESET sits at the top of the supplemental range. Additionally, RESET provides 3,000 mg glycine (the rate-limiting GSH precursor in aging), creating a dual-pathway replenishment system: SAG delivers preformed GSH directly, while glycine fuels de novo synthesis. Clinical evidence for oral glutathione supplementation comes primarily from studies using reduced GSH (Richie et al. 2015). S-Acetyl Glutathione offers superior GI stability based on preclinical pharmacokinetic data (Cacciatore et al. 2010).
24-Hour Glutathione Cycle — APEX + RESET Protocol
APEX recycles existing glutathione during daytime cognitive demand (Na-R-ALA). RESET replenishes the total pool at night (SAG + Glycine) and activates the GPx clearance system (Selenium). The glymphatic system handles waste; glutathione processes it downstream. Recycle by day, replenish by night.
How S-Acetyl Glutathione Connects Across the System
S-Acetyl Glutathione is the hub of a layered antioxidant defense architecture spanning both RESET and APEX — connecting precursor supply, enzymatic cofactors, and the full redox recycling network.
Dual-Pathway GSH Replenishment
S-Acetyl Glutathione delivers preformed GSH directly into cells, bypassing de novo synthesis entirely. Simultaneously, Glycine (3,000 mg) saturates the rate-limiting precursor for endogenous GSH production. Two independent mechanisms feeding the same pool — direct delivery plus synthesis substrate — for maximum overnight replenishment.
SOD → GPx Enzymatic Cascade
Zinc + Copper power Cu/Zn-SOD (SOD1), which converts superoxide radicals into hydrogen peroxide. H₂O₂ is still toxic — it must be cleared by GPx, which consumes GSH with Selenium as cofactor. S-Acetyl Glutathione provides the substrate, Selenium activates the enzyme, and Zn+Cu complete the upstream half. Designed as a complete enzymatic chain from radical to water.
Layered Antioxidant Defense Architecture
Pycnogenol® provides vascular/endothelial antioxidant coverage (Layer 1). GSH + GPx handles cytoplasmic H₂O₂ and Phase II conjugation (Layer 2). Ubiqsome® CoQ10 + NeoAXT™ Astaxanthin protect mitochondrial membranes and the ETC (Layer 3). Taurine stabilizes mitochondrial membrane potential, reducing ROS generation at the source. Four layers, four mechanisms, one integrated defense system.
24-Hour Glutathione Cycle
Na-R-ALA in APEX is one of the few antioxidants shown to directly recycle glutathione — reducing GSSG back to GSH without requiring the glutathione reductase/NADPH pathway. During the day, it keeps the existing GSH pool turning over efficiently. At night, S-Acetyl Glutathione replenishes the total pool with fresh molecules, and Glycine fuels de novo synthesis. Recycle by day, replenish by night.
Key Takeaways
The Bioavailability Problem, Solved
Standard reduced glutathione is degraded by gastric acid and intestinal enzymes before absorption. The S-acetyl group caps the reactive thiol, allowing the intact molecule to pass through the GI tract and deliver free GSH directly inside cells — no de novo synthesis required.
Terminal Node of the Antioxidant Network
Glutathione is not just another antioxidant — it is the terminal recycler that regenerates both Vitamin C and Vitamin E. It powers the GPx system for H₂O₂ clearance, drives Phase II detoxification, and protects mitochondrial DNA. Every other antioxidant eventually depends on it.
Timed for the Night Shift
The glymphatic system clears 60% more metabolic waste during sleep — and the downstream detox machinery runs on glutathione. RESET delivers 300 mg S-Acetyl Glutathione precisely when the brain’s cleanup crew is most active, designed to help keep the Phase II pipeline operating through the night.
Embedded in a 24-Hour Redox Architecture
APEX recycles glutathione during the day (Na-R-ALA). RESET replenishes the pool at night (SAG + Glycine) and activates enzymatic clearance (Selenium + Zn/Cu for the SOD→GPx cascade). Pycnogenol®, CoQ10, and Astaxanthin provide layered defense across vascular, cytoplasmic, and mitochondrial compartments. It’s not a standalone supplement; it’s the hub of a closed-loop antioxidant system.
Frequently Asked Questions
What is S-Acetyl Glutathione?
S-Acetyl Glutathione (SAG) is an acetylated form of glutathione — the body’s most abundant intracellular antioxidant. The acetyl group on the sulfur atom protects the reactive thiol from oxidation in gastric acid and cleavage by intestinal enzymes, allowing intact glutathione to be delivered directly into cells.
Why can’t I just take regular glutathione?
Standard reduced glutathione (GSH) is oxidized by gastric acid (pH 1.2–2.0) and cleaved by gamma-glutamyltranspeptidase (GGT) at the intestinal brush border — broken into constituent amino acids before absorption. Your body gets fragments, not functional antioxidant. The S-acetyl group solves this by shielding the reactive site through GI transit.
What does the clinical research show?
Richie et al. (2015, n=54) demonstrated that oral glutathione at 250–1,000 mg/day produced 17–35% increases in blood GSH and doubled NK cell cytotoxicity at 3 months. Sekhar et al. (2011) showed that glutathione precursor supplementation restored GSH synthesis rates to youthful levels in elderly subjects and significantly reduced oxidative stress markers.
Why take glutathione at night?
During deep sleep, the glymphatic system increases metabolic waste clearance by ~60%. The downstream Phase II conjugation pathway that processes this waste runs on glutathione. If the GSH pool is depleted, the detox pipeline backs up overnight. Evening SAG delivery restocks the pool when demand is highest.
How does SAG work with other RESET ingredients?
SAG is the hub of a layered antioxidant system: it provides substrate for GPx (activated by Selenium), connects to the SOD cascade (powered by Zinc + Copper), and is supported by Glycine (3,000 mg) which fuels endogenous GSH synthesis. Pycnogenol®’s Nrf2 activation upregulates the very enzymes that produce and utilize glutathione.
How much S-Acetyl Glutathione is in RESET?
RESET delivers 300 mg of S-Acetyl Glutathione per serving — at the top of the supplemental range. This is paired with 3,000 mg Glycine (the rate-limiting GSH precursor in aging) for dual-pathway replenishment: direct delivery plus synthesis substrate.
References
- [1]Richie, J. P., Nichenametla, S., Neiber, W., Calcagnotto, A., Haber, J., Clement, L. M., & Muscat, J. E. (2015). Randomized controlled trial of oral glutathione supplementation on body stores of glutathione. European Journal of Nutrition, 54(2), 251–263.View
- [2]Sekhar, R. V., Patel, S. G., Guthikonda, A. P., Reid, M., Balasubramanyam, A., Taffet, G. E., & Jahoor, F. (2011). Deficient synthesis of glutathione underlies oxidative stress in aging and can be corrected by dietary cysteine and glycine supplementation. American Journal of Clinical Nutrition, 94(3), 847–853.View
Restock Your Master Antioxidant Overnight
S-Acetyl Glutathione is one of 25 active ingredients in RESET, engineered to work as a system — not a stack of standalone compounds.
*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. Consult your healthcare provider before starting any supplement regimen.