Glutathione dosing & administration
Your body's master antioxidant — a tiny three-part protein that shields your cells and helps clear out toxins.
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards
Dosing
How much do I take?
Subcutaneous: A small injection into the fatty layer just under the skin — the same way insulin is given.
Bioavailability High — most of the dose reaches your bloodstream, just more gradually than an IV.
2 documented dose levels — separate regimens, not a titration schedule
100 mg per injection
Frequency
2–3 times per week
Duration
Ongoing, as directed
Delivered under the skin, bypassing gut breakdown like the intramuscular route shown effective in a controlled trial (600 mg IM every other day) [7]. Subcutaneous-specific dosing is drawn from clinical practice rather than published trials, so start at the lower end to gauge tolerance. Most protocols use a 0.5–1 mL injection volume.
200 mg per injection (up to ~600 mg per week total)
Frequency
2–3 times per week
Duration
Ongoing, as directed
The most common subcutaneous range used in practice. It mirrors the systemic delivery of the controlled intramuscular protocol [7]; subcutaneous-specific numbers come from clinical use rather than trials. Rotate injection sites (abdomen, thigh) and use sterile, single-use supplies.
Timing
Best time to take
Oral glutathione is commonly taken in the morning. Some people split it or take it on an empty stomach, though trials simply used daily dosing [2].
With food?
Can be taken with or without food. An empty stomach may slightly reduce competition from dietary proteins, but consistency matters more than timing.
If stacking
Often paired with vitamin C, N-acetylcysteine (NAC, a cysteine source the body uses to build glutathione), alpha-lipoic acid, or selenium, which support the glutathione recycling system.
Adjusting your dose
Increase if
- You tolerate the starting dose well and want stronger support
- You are using a low-absorption oral form and feel no effect after several weeks
Decrease if
- You notice stomach upset, bloating or loose stools
- You experience any cough or chest tightness with inhaled forms
Signs of right dose
- Steady energy and general well-being
- No digestive upset
- Lab work (if checked) shows improved glutathione or oxidative-stress markers
Administration
How do I use it?
Reconstitution
What you need
Injection
Route
Subcutaneous injection is the most common self-administered route in practice. Clinical studies also used intravenous (IV) infusion [1] and intranasal spray [3]; intramuscular injection is used in some clinics.
Best sites
Storage
Before reconstitution
Keep oral capsules and powders in a cool, dry place away from light and humidity. Liposomal liquids often need refrigeration — follow the label. Glutathione's sulfur group is sensitive to air and moisture.
After reconstitution
Once a clinic vial is mixed or a liquid is opened, refrigerate and use within the timeframe on the label. Do not freeze unless directed.
Signs of degradation — discard the vial
Safety
Is it safe?
Side effects
Commonly reported: Generally well tolerated, Unpleasant smell or taste
Less common: Mild stomach upset, bloating or loose stools, Transient cough
Stop and seek help if
- Any wheezing, cough or chest tightness with inhaled forms
- Signs of an allergic reaction (rash, swelling, trouble breathing)
- Persistent stomach upset that does not settle with a lower dose
- Your doctor advises stopping before a procedure or new treatment
This information is educational and not medical advice. Glutathione is not an FDA-approved drug. Talk with a qualified healthcare provider before starting, especially if you have asthma, are pregnant or breastfeeding, or take other medicines.
Flagged pairings
- Chemotherapy (e.g., cisplatin) — Studied to reduce some chemo side effects, but could affect treatment — use only under oncologist guidance
Published research
What the studies show
Hauser RA, Lyons KE, McClain T, Carter S, Perlmutter D · 2009
In 21 people with Parkinson's, IV glutathione 1,400 mg three times a week for 4 weeks was well tolerated with no safety concerns. Motor/daily-living scores improved by a mean of 2.8 units more than placebo, but the difference was not statistically significant (P=0.32).
Richie JP Jr, Nichenametla S, Neidig W, et al. · 2015
In 54 non-smoking adults, oral glutathione (250 or 1,000 mg/day for 6 months) raised body glutathione stores in a dose-dependent way — about 30–35% in blood compartments and 260% in cheek cells at the high dose. Natural killer immune cell activity more than doubled at the high dose by 3 months.
Mischley LK, Conley KE, Shankland EG, et al. · 2016
In 15 people with mid-stage Parkinson's, a single 200 mg intranasal dose raised measured brain glutathione (by MRS) — roughly a 269% increase in the glutathione-to-creatine ratio at 45 minutes, staying elevated for at least an hour (P<0.001).
Kennedy L, Sandhu JK, Harper ME, Cuperlovic-Culf M · 2023
Reviews how glutathione protects cells: it neutralizes peroxides as a partner to glutathione peroxidase (cycling between GSH and GSSG via glutathione reductase and NADPH), tags toxins for removal through glutathione-S-transferase, and fine-tunes protein function through reversible S-glutathionylation.
Marrades RM, Roca J, Barberà JA, et al. · 1997
In people with mild asthma, inhaled (nebulized) glutathione caused cough, breathlessness and measurable airway narrowing. The effect tracked with sulfite sensitivity, flagging an important caution for the inhaled route in asthma.
Simoni RD, Hill RL, Vaughan M (historical review of Hopkins' work) · 1988
Traces glutathione's history: first observed in yeast by de Rey-Pailhade in 1888 (he called it philothion), extracted and named by F. Gowland Hopkins in 1921, and confirmed in 1929 as a tripeptide of glutamate, cysteine and glycine.
Lenzi A, Culasso F, Gandini L, Lombardo F, Dondero F · 1993
In a placebo-controlled, double-blind crossover trial, glutathione given as 600 mg by intramuscular injection every other day for 2 months significantly improved sperm motility and structure in men with infertility — peer-reviewed evidence that injected glutathione has measurable effects.
Watanabe F, Hashizume E, Chan GP, Kamimura A · 2014
In a double-blind, placebo-controlled split-face trial in 30 healthy women, a 2% oxidized glutathione (GSSG) lotion applied twice daily for 10 weeks significantly reduced the skin melanin index (lighter skin tone) and improved skin moisture barrier, with no significant adverse effects.
Mischley LK, Leverenz JB, Lau RC, et al. · 2015
In 30 people with Parkinson's randomized to placebo, 300 mg/day, or 600 mg/day of intranasal glutathione (divided into three daily doses) for 3 months, there were no substantial differences between groups in the number of adverse events, and all groups met the tolerability criteria.
Mischley LK, Lau RC, Shankland EG, Wilbur TK, Padowski JM · 2017
In 45 people with Parkinson's randomized to placebo, 100 mg, or 200 mg of intranasal glutathione three times daily for 3 months, symptom scores improved in every group including placebo, and neither dose was superior to placebo. One of the 15 people in the 200 mg group developed cardiomyopathy.
Bagnato GF, Gulli S, De Pasquale R, et al. · 1999
In 12 people with mild-to-moderate asthma in a double-blind crossover study, inhaling 600 mg of glutathione 30 minutes before a nebulized-water ('fog') challenge cut the challenge-induced lung-function fall to a 6% FEV1 drop, versus a 20% drop after placebo — a protective effect, in contrast to the bronchoconstriction reported when glutathione itself was nebulized in asthma.
Sinha R, Sinha I, Calcagnotto A, et al. · 2017
In a 1-month pilot of 12 healthy adults (no placebo arm) taking 500 or 1,000 mg/day of liposomal glutathione, whole-blood glutathione rose up to 40% versus baseline and natural-killer cell activity rose up to 400% by 2 weeks; the two dose groups did not differ.
Want the full picture?
The complete Glutathione research profile: mechanism of action, clinical studies, effectiveness timeline, and FAQ.