Glutathione labels range from 100 mg to 1,000 mg per serving, and it’s rarely obvious why.
The honest answer is that there’s no official recommended daily amount for glutathione. Unlike vitamin C or magnesium, it has no established RDA, so any number you see comes from clinical studies or manufacturer convention.
This guide walks through the ranges that human studies have actually used, why the right number depends heavily on the form you take, and when more stops being better.
There Is No Official Daily Dose
Your body makes its own glutathione, so health authorities haven’t set an intake target the way they have for essential nutrients.
What exists instead is a body of small clinical trials, most of them short, using a fairly wide range of oral doses. The figures below describe what researchers have studied. They are not individual recommendations.
What Clinical Studies Have Used
Most oral glutathione trials in adults have used between 250 mg and 1,000 mg per day, sometimes taken as a single dose and sometimes split in two.
A six-month randomized controlled trial by Richie et al. (2015) reported that daily oral glutathione at 250 mg and 1,000 mg raised glutathione levels in blood and several tissues. A shorter four-week trial by Allen and Bradley (2011) using 500 mg twice daily found no change in glutathione status or oxidative stress markers. Results across standard oral studies have been inconsistent, which is why delivery form matters so much.
A one-month pilot study of liposomal glutathione, published in the European Journal of Clinical Nutrition (Sinha et al., 2018), used 500 mg and 1,000 mg per day in healthy adults. Both doses raised glutathione stores, and the researchers saw no clear difference between the two. The authors noted that the sample was small, so the lack of a dose difference should be read cautiously. The full text is available on PubMed Central.
Skin studies have used roughly 250–500 mg per day for 4 to 12 weeks. A 12-week placebo-controlled trial in healthy women by Weschawalit et al. (2017) used 250 mg per day and reported effects on skin properties, though results across trials have been mixed.
Dose Ranges by Form
| Form | Typical studied range | Notes |
|---|---|---|
| Standard oral capsule | 250–1,000 mg/day | Absorption is limited, and results across trials conflict |
| Liposomal | 100–500 mg/day | Better absorption means lower doses are often used |
| Sublingual | About 300–500 mg/day | Less independent research than liposomal |
Standard oral glutathione is broken down heavily during digestion, which is why doses below about 500 mg are unlikely to produce measurable changes in healthy adults. Liposomal forms protect the molecule through digestion, so a lower label dose can deliver comparable results.
For a closer look at how the forms differ, see our guide to liposomal vs. sublingual vs. IV glutathione.
Dose by Goal
Different goals tend to be associated with different ranges in the research, though the evidence for each is modest.
General antioxidant support. Studies on healthy adults most often fall in the 250–500 mg range for oral forms, or lower for liposomal.
Skin tone and brightness. Trials in this area have used roughly 250–500 mg per day for 4 to 12 weeks. Results varied between studies, so this should be seen as a possible modest effect rather than a guarantee.
Liver and detox support. There’s no standard dose here. Glutathione is central to liver detoxification pathways, but the clinical evidence for specific oral doses is limited, and anyone with a liver condition should work with a healthcare provider.
Should You Start Low and Build Up?
For most people, starting at the lower end of the studied range for your chosen form is a sensible approach.
With a liposomal product, that often means 100–250 mg per day for the first couple of weeks, then adjusting based on tolerance and the product’s label directions. Higher doses haven’t clearly shown better results in the small trials that compared them, so there’s little reason to jump straight to the top of the range.
If you take 1,000 mg per day, splitting it into two doses may be easier on digestion than taking it all at once.
When and How to Take It
Glutathione is typically taken once daily. Some people prefer an empty stomach, while others take it with food to reduce stomach upset. Either approach is common, so choose whichever you’ll stick with consistently.
Pairing it with vitamin C is popular, since vitamin C helps regenerate the active form of glutathione. A modest amount from food or a standard supplement is usually enough.
Consistency matters more than timing. Most studies measured effects over weeks to months, not days.
Can You Take Too Much?
Oral glutathione has been generally well tolerated in trials, including the six-month study at up to 1,000 mg daily cited above.
Still, “well tolerated in trials” is not the same as “risk-free for everyone.” These trials were small, short, and run in healthy adults, so they say little about very long-term use or about people with medical conditions.
Staying within the studied range and following the product label is the safest default.
Safety Considerations
Talk to a healthcare provider before starting glutathione if you are pregnant or breastfeeding, undergoing chemotherapy, taking immunosuppressant medication, or managing liver or kidney disease.
Glutathione supplements are not a treatment or cure for any condition, and dose numbers in this article should not replace advice from your healthcare provider.
FAQs
No. 500 mg per day is one of the most commonly studied oral doses, and it has been used in trials lasting several weeks to months without serious adverse effects. For liposomal products, 500 mg is at the upper end of the typical range, so some people use less.
Studies and product labels most often fall between 100 mg and 500 mg per day. Starting at the lower end and following the specific product’s directions is a reasonable approach.
Trials have used 1,000 mg per day for up to six months in healthy adults without serious side effects. However, one small study found no clear benefit over 500 mg, so higher doses are not necessarily better.
There’s no strong evidence favoring one time over the other. Take it when you’ll remember it, and with food if it upsets your stomach.
Studies measuring skin or oxidative stress markers typically ran 4 to 12 weeks or longer. Individual results vary, and glutathione is not a fast-acting supplement.
Yes, potentially. People undergoing chemotherapy, taking immunosuppressants, managing liver or kidney conditions, or who are pregnant or breastfeeding should consult a healthcare provider before starting any glutathione supplement.
Final Thoughts
There’s no single correct glutathione dose, since the right number depends on the form and the goal. Standard oral capsules have generally been studied at 250–1,000 mg per day, while liposomal products typically use 100–500 mg because they’re better absorbed.
For most people, starting low with a well-absorbed form, taking it consistently, and giving it several weeks is a more practical approach than chasing higher numbers.
If you’re comparing products, our best liposomal glutathione supplements guide lists each option’s dose per serving, form, and third-party testing. If you’re considering NAC instead, our NAC vs. glutathione comparison explains how the two differ.
Anyone with a diagnosed medical condition or taking prescription medication should confirm a dose with a healthcare provider first.