ResearchSafe

GlyNAC (Glycine + N-Acetylcysteine)

Category: Anti-Aging. Status: OTC supplement combination.

A combination of glycine and N-acetylcysteine that supplies the precursors for glutathione synthesis. Clinical studies in older adults showed GlyNAC restored glutathione, improved mitochondrial function, and reversed multiple hallmarks of aging.

How it works

Glycine and NAC (a cysteine donor) are the rate-limiting precursors for glutathione. Replenishing both restores intracellular glutathione, lowers oxidative stress, improves mitochondrial fuel oxidation, and reduces inflammation and insulin resistance.

Key facts

  • Molecular weight: Glycine 75.07 Da / NAC 163.19 Da
  • Half-life: Glycine ~1 h; NAC ~6 h
  • Bioavailability: Glycine high; NAC ~4-10% but effective as cysteine donor
  • Storage: Room temperature, keep dry.

Dosing overview

  • Typical dose: Glycine ~100 mg/kg + NAC ~100 mg/kg per day
  • Frequency: Split 1-2x daily
  • Duration: Ongoing
  • Route: Oral (powder or capsule)

Protocol notes

  • Trial protocol used roughly equal weight-based doses of glycine and NAC (about 100 mg/kg/day each).
  • For a typical adult this is often simplified to ~3-6 g glycine + ~1.8-2.4 g NAC daily.
  • Powder glycine is naturally sweet and mixes well; split doses improve tolerance.

Reported benefits

  • Restores glutathione levels
  • Improves mitochondrial function
  • Lowers oxidative stress and inflammation
  • Better insulin sensitivity
  • Improved strength and cognition (elderly)
  • Sleep support (glycine)

Possible side effects

  • Mild GI upset
  • Loose stools at high NAC doses
  • Sulfur odor (NAC)
  • Rare headache

Research

  • GlyNAC reverses aging hallmarks in older adults (2022): Corrected glutathione deficiency and improved mitochondrial function, insulin resistance, strength, and cognition in a clinical trial of older humans.
  • GlyNAC and oxidative stress (2021): Reduced oxidative stress and inflammation markers while improving several aging biomarkers.

Community reviews of GlyNAC

Rated 4.8 out of 5 from 5 community reviews by ResearchSafe members.

  • morning_pin_maya rated it 5/5 - Solid compound with real results: Been using GlyNAC for about 2 weeks and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
  • growth_factor_gabe rated it 5/5 - Genuinely effective after 3 weeks: Been using GlyNAC for about 3 weeks and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
  • bio_optimal rated it 5/5 - Noticed clear benefits within weeks: Added GlyNAC to my protocol about 4 months ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
  • research_marcus rated it 4/5 - Consistent improvement over 1 month: Added GlyNAC to my protocol about 1 month ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
  • longevity_anna rated it 5/5 - Worth adding to the protocol: GlyNAC has been a worthwhile addition. I am data-driven and tracked relevant markers before, during, and after. The improvement is measurable and correlates with the intervention timeline. What sets this apart from some compounds I have tried is the consistency. Benefits did not fluctuate wildly or disappear. They built up and maintained. That gives me confidence in the mechanism. Tolerance has been excellent. Nothing in my bloodwork or subjective experience raised any flags. This is the kind of compound that does its job quietly without causing problems. Exactly what you want.

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Community discussions about GlyNAC

Research and educational reference only. Not medical advice.