Chronic Fatigue and What Helped: 2 Years on Glutathione

I’ve been taking glutathione for a little over two years. This is the record of it — the symptom that sent me looking for it, what the research actually says, and what two years of taking it has been like.

The symptom

Mornings, my body felt heavy. Not the sore-muscle kind of heavy you get the day after a workout — the act of getting up was itself difficult. If you’ve had mornings where standing up is the hard part, you know the feeling.

I figured it was low blood pressure. Never bad enough to see a doctor about, and it repeated every single morning.

What sent me looking

I’d seen clips of celebrities getting glutathione IV drips when their schedules left them exhausted. If it’s an ingredient people take by drip, I wanted to know whether it acted on fatigue at all, so I went reading.

What glutathione is

An antioxidant the body already makes on its own.

When cells — the mitochondria specifically — produce or spend energy, they use oxygen, and free radicals are left behind as a byproduct. Free radicals are unstable, so they pull electrons from nearby cells. That’s where cells get damaged, and the damage can show up as fatigue or inflammation.

When an antioxidant is present, free radicals take electrons from it instead of from cells. The cells take that much less damage.

The research on oral glutathione is split

Whether swallowed glutathione raises levels in the body is not settled.

The side that found no change — in a randomized, double-blind, placebo-controlled trial in 40 healthy adults, oral supplementation moved neither the markers of oxidative stress nor the glutathione levels inside red blood cells to any significant degree.

The side that found one — in a trial of 354 people that included type 2 diabetics, the group taking 500mg a day for six months showed a significant rise in blood glutathione.

Dose, how long people took it, and the measurement method are what get named as the reasons the results diverge. The first study gave a short course to healthy adults; the second gave a high dose for six months to a group with an underlying condition.

Form splits the results too — a crossover trial in 20 people with metabolic syndrome gave the same dose (450mg a day for three weeks) orally and sublingually (under the tongue), and the sublingual arm came out higher on both blood levels and the reduced-glutathione ratio.

Sources: oral vs. sublingual crossover trial (Redox Biology, 2015) · oral glutathione in healthy adults (J Altern Complement Med, 2011) · long-term supplementation randomized controlled trial (Antioxidants, 2022)

None of that means the findings carry over to any one person. What follows is only my own record of taking it.

What I take now — Thorne Glutathione-SR

• Count: 60 capsules (175mg of glutathione per capsule)
• Dose: the label says two to three divided doses a day. I take one capsule, before breakfast.
• Cost: roughly 14 times what one of the vitamin C tablets I take alongside it costs.

At the label’s three capsules a day, a bottle runs out in 20 days. That’s the reason I cut it to one. For reference, iHerb listed it at $46.55 for 60 capsules in September 2026, but price moves by seller and by date — check the product page before you buy.

The capsule is smaller than a standard 1000mg vitamin C tablet. Small enough that taking it daily isn’t a burden.

SR — sustained release

Sustained release means the ingredient is let out slowly rather than absorbed all at once, so it stays around longer. That said, going by the by-form research above, sublingual and liposomal versions showed the better absorption numbers. So I’m looking at switching products, though for now I’m staying on the SR.

Two years in

In the second week, the morning heaviness was gone. It hasn’t come back in the two years since.

Whether that was a liver thing or a fatigue thing, I never checked. I didn’t compare blood work before and after — this is a record of whether the symptom was there or not, nothing more.

It was my first supplement. Since that experience, the number of supplements I take has grown a lot.

Notes on the other supplements I take at the same time of day are in Acid Reflux Symptoms and What Helped: 3 Years, Mastic Gum.

This is a record of my own experience, not medical advice. If fatigue persists, please see a doctor to find out why.