How it works
Glutathione is built from three amino acids: glutamate, cysteine and glycine. Your cells make it continuously and it is the main thing standing between them and oxidative damage. None of that is in dispute.
The question the marketing skips is whether adding more from outside changes anything. Levels inside cells are tightly regulated, and the rate-limiting step is the supply of cysteine rather than the availability of finished glutathione.
What the evidence shows
The strongest evidence here is negative rather than positive. Oral glutathione is largely broken down in the gut into its constituent amino acids before absorption, which is why the oral form struggles to raise levels meaningfully. A phase IIb randomised trial of intranasal glutathione in Parkinson's disease found no difference from placebo. No adequately powered trial supports the energy, detoxification or anti-ageing claims it is sold on.
Typical dosing
There is no established therapeutic dose, because there is no approved indication. Clinic protocols vary widely and are not derived from outcome trials.
Reported side effects
Intravenous administration carries the ordinary risks of IV access, including infusion reactions and infection. Serious adverse events including severe skin reactions, thyroid dysfunction and kidney injury have been reported in association with high-dose injectable glutathione used for skin lightening. Rates are not established, because the use is unregulated.
Labelled warnings and contraindications
- Injectable glutathione is not an approved product. The FDA has warned consumers about unapproved injectable skin lightening products, which is the use driving most of the global market.
- Compounded sterile injectables carry a contamination risk that depends entirely on the facility preparing them.
- Skin lightening is the use with the most reported harm, and also the use with no efficacy evidence at all.
- If this is being sold to you for fatigue, the more useful step is finding out why you are fatigued.
Legal status and sourcing
Glutathione is not an FDA-approved drug for any indication. Injectable and intravenous preparations are compounded rather than manufactured as approved products.
Oral glutathione is sold as a dietary supplement, which means it is regulated as a food rather than a medicine and carries no requirement to demonstrate that it works.
What it costs
IV clinic pricing varies widely by market and is usually sold as a package or a membership rather than per infusion, so a single figure would mislead. We are not publishing one.
How confident anyone can be
Low for the reasons it is sold, reasonable for the underlying biochemistry. That glutathione matters inside cells is not in question. That paying for an infusion of it changes anything you can feel is.
If the goal is genuinely to raise glutathione, the better-evidenced route is supplying cysteine, which is the rate-limiting precursor, rather than infusing the finished molecule. That is a conversation for a clinician rather than a clinic selling drips.