NAD+ and Glutathione
Is NAD+ with glutathione worth injecting, and does the injection do anything a pill or an IV drip does not?
Reviewed by the amino101 editorial team. .
Also searched as NAD glutathione injection, NAD+ glutathione IV, antioxidant energy stack, NAD and GSH.
NAD+ is a coenzyme found in every living cell, not a peptide. It is central to energy metabolism and DNA repair, declines with age, and is injected or infused by people hoping to restore energy, cognition, and cellular resilience.
Glutathione is a tripeptide of glutamate, cysteine and glycine that every cell makes as its main antioxidant. People use it by injection, IV, oral, liposomal or nebulized routes for oxidative stress, liver support, immune health and skin lightening.
Start with what these are not. NAD+ is not a peptide at all; it is a coenzyme made of two nucleotides, and it sits in peptide catalogs only because it is sold as a lyophilized powder and injected the same way. Glutathione is a tripeptide only by a technicality: its glutamate is joined through a side chain bond rather than a normal peptide bond, which is why it resists digestion and why it is sold as an ordinary supplement. People pair them because glutathione is recycled from its oxidized form by an enzyme that runs on NADPH, so the two are metabolically linked, and because IV clinics have infused them together for years. The human evidence for the pair is nil. For each alone it is thin: oral NAD+ precursors reliably raise blood NAD+ with modest functional benefit, a six month oral glutathione trial raised body stores, injected NAD+ has a single pharmacokinetic study, and injectable glutathione has solid data only as an adjunct to cisplatin chemotherapy.
Most searches about this pair are route questions: subcutaneous injection at home, IV at a clinic, or capsules. This page compares the three honestly, gives the dosage ranges that circulate for each, and explains the injection flush that surprises first-time NAD+ users. The NAD+ vs glutathione page compares the compounds alone. Neither is approved as a drug for any of this, and the page is educational only.
Why people combine NAD+ and Glutathione
When glutathione neutralizes a radical it is oxidized to GSSG, and glutathione reductase rebuilds it using NADPH, which cells make from NAD+ pathways. That is the one mechanistic reason to pair them that holds up: raising NAD+ availability in theory keeps more glutathione in its active form. Whether injected doses of either change that in a healthy person is unmeasured.
NAD+ shuttles electrons in glycolysis, the citric acid cycle and fat oxidation, and is consumed by sirtuins and PARPs that handle stress and DNA repair. Glutathione handles peroxides and recycles vitamins C and E. The pitch is mitochondrial throughput on one side and damage control on the other, which is why the pair ends up in longevity protocols alongside MOTS-c and SS-31.
IV clinics infuse NAD+ at 250 to 1000 mg over hours and glutathione at 600 mg to 2 g in the same visit. Subcutaneous injection at 50 to 100 mg of NAD+ and 200 to 600 mg of glutathione is the at-home version. The home version is cheaper and gentler; whether either does more than a good oral precursor is not established.
Injected NAD+ probably does not enter cells intact. It is broken down outside cells into nicotinamide and other precursors that cells rebuild, which is the same thing an NR or NMN capsule supplies. Injected glutathione gives a short plasma spike and cells still have to take up the components. High dose antioxidants may also blunt some training adaptations. The stack does not deliver anything to a mitochondrion that diet, NAC and sleep were not already supplying; it does it faster and with a flush.
NAD+ and Glutathione dosage and protocol
What appears in research and community protocols for each compound in the stack. Not a prescription.
| Peptide | Dosage | Frequency | Timing and route |
|---|---|---|---|
| NAD+ | 50 to 100 mg | once daily or a few times per week | subcutaneous in the belly or thigh, morning, injected slowly; intramuscular is faster and more likely to flush |
| Glutathione | 200 to 600 mg | 2 to 3 times weekly | subcutaneous or intramuscular, belly or thigh, after training or before bed; oral liposomal 250 to 1000 mg daily is the alternative |
There is no established cycle for either. People run daily NAD+ injections for 4 to 8 weeks and reassess, or use a few injections a week indefinitely. Glutathione injections are run ongoing or in 8 to 12 week courses. IV clinics space infusions weekly to monthly. Many people pause for a few weeks between courses to see whether they notice a difference, which is the only marker available at home.
- •People start NAD+ at 50 mg to gauge the flush. Injecting slowly and going subcutaneous rather than intramuscular makes it milder.
- •Glutathione oxidizes fast once reconstituted. Use within 1 to 2 weeks and discard if it discolors or smells of sulfur. NAD+ solution should stay clear and colorless; yellow means degraded.
- •Morning for NAD+, and not before driving or training, because of the possible fatigue wave. Glutathione is often kept to rest days by people worried about blunting exercise adaptation.
- •Oral alternatives: NR or NMN at 250 to 1000 mg daily for NAD+, and NAC 600 to 1200 mg plus glycine for glutathione. Both have more controlled data than the injections.
Work out syringe units for any of these in the dosage calculator.
Can you mix NAD+ and Glutathione in one syringe?
These two are not usually drawn into one syringe, and the reasons are practical rather than chemical: NAD+ is a daily or near daily morning injection, glutathione is two or three times a week and often evening, and both degrade quickly in solution, glutathione by oxidizing within days and NAD+ faster than most peptides, so a mixed vial would have the shortest shelf life of anything on this site. IV clinics do run them in the same session, typically as separate bags or a sequential push rather than one mixture. For the home route, separate vials and separate syringes are the norm. The reconstitution guide covers the volumes, which are larger than for most peptides.
What to expect, week by week
- First injection
NAD+ stings, then a flush, mild nausea or a wave of fatigue for 20 to 60 minutes. Glutathione gives a sulfur smell or taste. Both settle the same day.
- Week 1 to 2
Some people report better afternoon energy, sleep or recovery. Many report nothing beyond the injection reactions.
- Week 2 to 4
Whatever benefit there is has usually shown up by now. There is no home measurable marker to track.
- Month 3 to 6
Oral glutathione raised blood levels on this timeline in the controlled trial, with the largest change at 6 months. Nothing comparable has been measured for injections, and long term effects on aging are unproven.
Side effects and cautions
- ▲Stinging, redness or swelling at the NAD+ injection site
- ▲Flush, chest tightness, cramping and nausea from NAD+, mainly with fast IV infusion
- ▲Transient fatigue or a flu-like feeling after an NAD+ injection
- ▲Sulfur smell or taste after a glutathione injection
- ▲Nausea or stomach cramps, more with oral glutathione
- ▲Headache, reported with both
- ▲Bronchospasm from glutathione in rare cases, mostly in people with asthma or sulfite sensitivity
- ■Asthma or sulfite sensitivity. Injectable and nebulized glutathione have triggered bronchospasm in rare cases.
- ■Active cancer or chemotherapy. NAD+ supports proliferating cells as much as healthy ones, and an antioxidant alongside any chemotherapy other than cisplatin needs the oncologist's input, not a self-directed decision.
- ■Any chest pressure, palpitations or shortness of breath during or after an NAD+ dose. That is a stop, not something to push through.
- ■IV glutathione for skin lightening from an unregulated clinic. Kidney and liver problems and serious reactions have been reported, and this is where most of the documented harm from the compound has come from.
This pair is for someone who has already tried the cheap, better supported versions, an NR or NMN capsule and NAC with glycine, wants to see whether injections feel different, and accepts that the answer may be only the flush. The mechanism linking the two is real, the clinic tradition is long, and the human evidence that either injection improves anything in a healthy person is missing. Someone who only wants the energy angle can run NAD+ alone and judge it on how afternoons feel over a month. Someone who wants the antioxidant or liver angle can run glutathione alone, or simply take NAC. Running both from the start doubles the cost and the injection reactions without telling you which one mattered. Anyone with asthma, a cancer diagnosis or chest symptoms during dosing has clear reason not to inject either. Neither is a peptide in the strict sense, neither is approved for this, and this page is educational only.
NAD+ and Glutathione: frequently asked
Can you take NAD+ and glutathione together?
Yes, and IV clinics have done so for years. At home they are separate injections on their own schedules, NAD+ in the morning most days and glutathione two or three times a week. There is no interaction concern, just no evidence the pairing does more than either alone.
Is an NAD+ injection better than NMN or NR pills?
Nobody knows. Oral precursors have controlled trials showing they raise blood NAD+. Injected NAD+ has one small pharmacokinetic study, and since it is likely broken down to precursors before entering cells anyway, the advantage of injecting is not established.
What does an NAD+ injection feel like?
A flush, mild nausea or a wave of fatigue for 20 to 60 minutes, then for some people a sense of energy later in the day. Slow subcutaneous injection is gentler than intramuscular, and fast IV infusion is what causes chest tightness and cramping. The peptide side effects article covers what is normal and what is not.
Does oral glutathione work?
Older studies said no, but a six month randomized trial of 250 to 1000 mg daily did raise blood and cell glutathione. It is slow and modest. Liposomal forms absorb better, and NAC plus glycine is a cheaper, well supported way to raise it from the inside.
Is NAD+ a peptide?
No. It is a coenzyme made of two nucleotides and is chemically unrelated to peptides. Glutathione is a tripeptide, but with an unusual gamma bond, and it is more a supplement than a research peptide. Neither belongs in a peptide stack in the strict sense; they are here because people inject them alongside peptides.
How long should you run NAD+ and glutathione?
4 to 8 weeks of NAD+ injections and 8 to 12 weeks of glutathione is a common course, then a pause to see whether anything changes. There is no established cycle and no marker to track at home, so the pause is the test. See how long peptides last for the storage side, which matters more for these two than for most.
Related reading
Mitochondrial function, endurance and metabolic aging
Two injectables sold alongside peptides that are not really peptides. What does each one do?
Two mitochondrial peptides, usually run together. What does each one actually do?
Guide
Guide
Safety
Guide
Guide
Sources
- A pilot study investigating changes in the human plasma and urine NAD+ metabolome during a 6 hour intravenous infusion of NAD+. Frontiers in Aging Neuroscience, 2019
- Randomized controlled trial of oral glutathione supplementation on body stores of glutathione. European Journal of Nutrition, 2015
- Therapeutic potential of NAD-boosting molecules: the in vivo evidence. Cell Metabolism, 2018