What to know about stacking before you run Glutathione

A reader on r/tirzepatidecompound asked a straightforward question: if you're already running Sermorelin and want to add Glutathione and NAD+, do these three stack cleanly, or does the order and timing matter? Short answer: Glutathione stacking with NAD+ and Sermorelin works fine, but the three don't behave the same way logistically, and treating them as one interchangeable injection routine is where people get tripped up.

Here's the piece that gets missed. Glutathione and NAD+ are metabolically connected. Sermorelin is not connected to either one mechanistically, and it runs on its own clock. Understanding that difference is really the whole answer to the stacking question.

Why Glutathione and NAD+ actually belong together

Glutathione neutralizes free radicals and then needs to be recharged back to its active form by an enzyme called glutathione reductase, which runs on NADPH. NAD+ feeds the pathway that produces that NADPH. So when you supplement NAD+ alongside glutathione, you're not just adding two separate "energy and antioxidant" compounds. You're supporting the recycling system that keeps glutathione active in the first place. This is the mechanism behind why the glutathione and NAD+ pairing shows up so often in practitioner stacks.

The research backing NAD+'s role here is solid on the precursor side. Oral nicotinamide riboside reliably raises blood NAD+ in a dose-dependent way, with one trial showing increases of 22%, 51%, and 142% at 100, 300, and 1000 mg respectively, which tells you the biochemical effect on NAD+ levels is reproducible and well-established. Separately, NMN improved muscle insulin sensitivity in a group of prediabetic postmenopausal women in a randomized trial, which is one of the more concrete functional outcomes in the NAD+ literature rather than just a biomarker shift (Yoshino et al. 2021). I bring these up not because you're necessarily taking oral NR or NMN if you're running injectable NAD+, but because they establish that raising NAD+ does real, measurable things in the body, which is the whole premise for why pairing it with glutathione makes biochemical sense rather than just marketing sense.

On the aging side, NAD+ decline is driven partly by an enzyme called CD38 that consumes NAD+ faster as inflammation and senescent cell burden go up. A mouse study found that knocking out CD38 entirely kept NAD+ at youthful levels regardless of age, which is animal data but it's a clean demonstration of the mechanism (Camacho-Pereira et al. 2016). That same review literature on NAD+ and sirtuin biology supports the broader case that restoring NAD+ supports mitochondrial function and DNA repair as we age (Imai & Guarente 2014). None of this is glutathione-specific, but it's the reason the pairing exists: you're not just topping up one antioxidant, you're supporting the whole recharge cycle underneath it.

Where Sermorelin fits, and why it's different

Sermorelin doesn't touch the glutathione or NAD+ pathway at all. It's GHRH(1-29), the fragment of your own growth-hormone-releasing hormone that signals your pituitary to release GH in a natural pulse. It works upstream, at the pituitary, on a completely separate signaling axis. I've fielded this exact question from people who assume every peptide in their stack needs to somehow "talk to" the others, and Sermorelin is a good example of why that's not how this works. It doesn't need to interact with glutathione or NAD+ to be useful, and it doesn't compete with them for any shared resource.

What matters for Sermorelin is timing, and this is where people mess up the stack. Its half-life is only about 10 to 12 minutes, so it's dosed at bedtime, fasted, specifically to ride your natural overnight GH pulse. Food near the injection, especially anything with carbs or fat, blunts the GH response because of the insulin spike. This is why Sermorelin has to stay its own separate injection on its own schedule rather than getting folded into whatever time you're running Glutathione and NAD+.

Building the actual routine

A reasonable version of this stack: Glutathione and NAD+ in the morning or whenever suits your day, Sermorelin at night before bed on an empty stomach. If you want to combine Glutathione and NAD+ into fewer injections, that's a personal-comfort decision rather than a mechanistic requirement. Reconstitution matters here too. Glutathione is light-sensitive and oxidizes readily, so store it reconstituted in the fridge, protect it from light, and swirl rather than shake when mixing. Shaking doesn't damage the peptide chemistry itself, the real degradation drivers for small peptides are heat, time in solution, light, and oxidation, but swirling still helps you avoid excess foaming and keeps your dosing accurate.

For NAD+, a common subcutaneous approach ramps slowly, starting around 25 mg twice a week and building up over several weeks rather than jumping straight to a full dose, which helps avoid the flushed, racing-heart sensation that can show up with fast NAD+ delivery. For Sermorelin, the community-standard adult dose runs roughly 200 to 300 mcg subcutaneously at night, about five nights a week. For Glutathione, a common range is 150 to 300 mg subcutaneously two to three times a week, or an oral S-acetyl glutathione form in the 500 to 1,000 mg daily range if injections aren't your preference.

My read on this after watching a lot of people ask this same question in different forms: the mistake isn't the stack itself, it's assuming three peptides means three identical injection routines. They're not identical, and matching the schedule to what each compound actually needs is the whole trick.

Now the part my lawyer makes me say, and he's right: The doses and schedules here are for educational and informational purposes only. These peptides are sold for research use only and are not FDA-approved drugs. This is not medical advice. Consult a qualified physician before beginning any protocol.

A word on where you're sourcing from

None of this stacking logic matters if the vial itself is compromised. Glutathione in particular is light- and oxidation-sensitive, so a product that's already partially oxidized before it even reaches you won't do the job at the cellular level no matter how carefully you dose it. I've seen people troubleshoot a "non-responsive" glutathione protocol for weeks before realizing the actual problem was the vial itself. Look for third-party testing that confirms both identity and purity beyond a label claim.

If you're newer to injecting more than one compound at a time, it's worth reading up on general handling basics before you start layering peptides, including how reconstitution and storage affect potency over time, and whether your setup calls for an auto-injector pen once you're managing multiple injections a week.

If you're already running Sermorelin and thinking about adding Glutathione and NAD+, start one at a time. Give each addition a couple of weeks before layering in the next, so if you notice an injection-site reaction or a change in how you feel, you actually know which compound caused it.

Thanks for reading! In health, Rick Gold