Glutathione is a tripeptide of glutamate, cysteine, and glycine. It is the body's primary intracellular antioxidant and a cofactor for dozens of detoxification enzymes. It is also one of the most over-marketed compounds in the wellness space, with claims that often outrun the evidence.
This guide focuses on what is reasonable to track if you decide to use it.
What it does
- Neutralizes reactive oxygen species directly
- Regenerates vitamins C and E
- Cofactor for glutathione-S-transferases (phase II liver detox)
- Supports immune cell function
Endogenous levels decline with age, in chronic disease, and under oxidative stress (alcohol, infection, intense training).
Typical protocol shape
Route matters more here than with most peptides:
- Oral: poorly absorbed; liposomal or S-acetyl forms claim better bioavailability but evidence is mixed
- Sublingual: modest absorption
- Subcutaneous or IM: commonly reported 200-600 mg, 2-3x per week
- IV push: clinical protocols use 600-2400 mg, 1-3x per week
- Nebulized: used in some pulmonary and ENT contexts
NAC (N-acetylcysteine) is often cheaper and raises intracellular glutathione by supplying the rate-limiting cysteine.
What to track daily
- Dose, route, time
- Sleep quality and duration
- Energy (0-10) morning and afternoon
- Skin appearance (subjective)
- Any sulfur-smell side effects or GI changes
What to track weekly
- Skin photos in consistent lighting (claims about brightening are common; evidence is weak outside high-dose IV in specific populations)
- Exercise recovery, soreness duration
- Resting heart rate trends
- Alcohol tolerance if relevant to your case
Peptide IA's photo log helps here because skin claims are easy to imagine and hard to verify without side-by-side comparison.
Bloodwork worth doing
- Baseline and quarterly: liver panel (ALT, AST, GGT, bilirubin)
- GGT in particular reflects oxidative stress and glutathione turnover
- Optional: oxidative stress markers (8-OHdG, F2-isoprostanes) if a lab will run them
- Red-cell glutathione assay if available
Realistic expectations
- Subjective energy and skin reports are common but heavily placebo-prone
- Liver enzymes may modestly improve in people with elevated baselines
- Whitening claims popular in cosmetic circles are based on small, often poorly controlled studies
- IV is not magic; route comparisons are sparse
Common mistakes
- Expecting oral glutathione to do what IV does
- Stacking with NAC and high-dose vitamin C without a hypothesis
- Ignoring sulfur sensitivity (some people feel worse)
- Using it as a hangover cure rather than addressing the cause
A tracking template
- Daily: dose, route, energy, sleep, side effects
- Weekly: skin photos, recovery notes, RHR
- Quarterly: liver panel, GGT
- Before/after cycle: subjective symptom scores
Bottom line
Glutathione has real biochemistry behind it but the consumer hype outruns the evidence. Track honestly, prefer cheaper precursors (NAC, glycine, whey) as a first line, and reserve injectable routes for defined trials with measurable endpoints.
Peptide IA is an educational and self-tracking tool. Nothing in this post is medical advice. Doses mentioned reflect what is commonly reported in research literature — they are not recommendations. Always consult a qualified physician before starting, changing, or stopping any protocol.