Reconstituting a glutathione vial comes down to one number: how many units do you draw on the syringe? This calculator gives you that in one step. Enter how many milligrams are in your vial, how much bacteriostatic water you're adding, and your target dose, and it returns the exact insulin-syringe mark, the concentration you've made, and how many doses the vial holds.
Glutathione is one of the peptides people use for skin and anti-aging, and it is dosed in large milligram amounts — self-injected routines commonly use 100 to 200 mg — so it ships in large vials, typically 600 mg or 1200 mg, that you reconstitute with a matching amount of water (3–6 mL). Mixed that way, a vial sits at around 200 mg/mL, where a normal dose lands on a comfortable mark and a vial covers several injections. Below the tool we walk through the math, why bigger vials keep the draw sensible, the difference between an IV drip and a self-injection, and what real glutathione users mix.
Key Takeaways
- Two-step math: concentration = vial mg ÷ bac water mL, then units = (dose mg ÷ concentration) × 100 on a U-100 syringe.
- Anchor example: a 600 mg vial + 3 mL of bacteriostatic water = 200 mg/mL; a 100 mg dose = 0.5 mL = 50 units, and the vial gives 6 doses.
- Match the water to the vial. Big vials take more water: 600 mg in 3 mL or 1200 mg in 6 mL both make 200 mg/mL, so a 100 mg dose is 50 units and a 200 mg dose is a full-but-fits 100 units.
- A vial is several doses. At ~100 mg, a 600 mg vial holds about 6 doses; our median works out near 6 doses per vial.
- IV is different. Clinic IV glutathione uses much larger amounts infused over time. This calculator is for reconstituting a vial to inject under the skin or into muscle.
- Not approved for whitening. Injectable glutathione for skin lightening is unapproved and carries safety warnings; treat every figure as calculation context, not advice.
| You enter | Value | The calculator returns | Value |
|---|---|---|---|
| Glutathione in vial | 600 mg | Concentration | 200 mg/mL |
| Bacteriostatic water | 3 mL | Volume to draw | 0.5 mL |
| Target dose | 100 mg | Draw to this mark | 50 units (U-100) |
| Syringe type | U-100 | Doses per vial | 6 |
How do you calculate a glutathione dose?
Glutathione reconstitution is two steps: work out the vial's concentration, then convert your milligram dose into a volume you can read on the syringe. Because the vials are large and you mix them with a matching amount of water, that volume lands comfortably inside one barrel.
In plain arithmetic:
- Concentration (mg/mL) = vial mg ÷ bac water mL. A 600 mg vial in 3 mL is 600 ÷ 3 = 200 mg/mL.
- Volume (mL) = dose mg ÷ concentration. A 100 mg dose at 200 mg/mL is 100 ÷ 200 = 0.5 mL.
- Units = volume × 100 on a U-100 syringe (100 units = 1 mL). So 0.5 mL = 50 units — half the barrel.
Collapsed into the single formula the calculator runs:
units = (dose mg ÷ (vial mg ÷ bac water mL)) × 100 = dose mg × bac water mL ÷ vial mg × 100
Sanity-check our example: 100 × 3 ÷ 600 × 100 = 50 units. For doses per vial, divide the vial's milligrams by your dose: 600 mg ÷ 100 mg = 6 doses.
Our take: The trick with glutathione is to match the water to the big vial. People who run into trouble usually used a small-vial habit — 1 or 2 mL — on a 600 mg vial, ending up with a thick, stinging concentrate. Reconstitute a big vial with a proportional volume (600 mg in 3 mL, 1200 mg in 6 mL) and you land at a clean 200 mg/mL, the concentration clinics use, where a 100–200 mg dose fits one syringe.
How much bacteriostatic water should you add to glutathione?
With glutathione, scale the water to the vial so you land near 200 mg/mL — about 3 mL for a 600 mg vial, 6 mL for a 1200 mg vial — which keeps a normal dose on a readable mark and the injection more comfortable. The water choice is mostly about concentration, not about fitting the dose.
At 200 mg/mL, a 100 mg dose is 50 units and a 200 mg dose is 100 units — both inside a single U-100 barrel. Going more concentrated than that (less water) shrinks the draw but makes a thicker, more stinging injection; going much more dilute makes a gentler injection but eventually pushes a big dose toward the top of the barrel. Around 200 mg/mL is the practical sweet spot, which is why the large vials pair with large water volumes. Because ProtocolPlus tracks reconstitutions, we can show the vial-strength × water-volume combinations real glutathione users log.
The pattern: users converge on roughly 200 mg/mL, whether from a 600 mg vial in 3 mL (the single most-logged setup) or a 1200 mg vial in 6 mL. The 1200 mg vial in 3 mL (400 mg/mL) is the other choice for those who want the smallest draw and don't mind a thicker injection. Almost nobody under-fills a big vial, because that makes a syrupy, stinging concentrate.
A worked walkthrough: water choice for glutathione
Say you have a 600 mg vial and your dose is 100 mg. Run the candidate water volumes:
- 2 mL → 300 mg/mL. 100 mg = 33 units. A small, concentrated draw that stings more.
- 3 mL → 200 mg/mL. 100 mg = 50 units. The common balance — comfortable mark, tolerable injection.
- 6 mL → 100 mg/mL. 100 mg = 100 units. The gentlest injection, though now a 200 mg dose would fill the whole barrel.
More water means a gentler injection and a larger, easy-to-read mark, with the only limit being the size of the barrel. The 3 mL mix (200 mg/mL) is the popular middle.
IV drip versus self-injection: which one are you doing?
Clinic IV glutathione is infused over time at much larger amounts and involves no syringe-unit math for you; this calculator is for reconstituting a vial to inject under the skin or into muscle at the smaller 100–200 mg self-injection doses. Know which you're doing before you use any dosing number.
Glutathione is given several ways, and they aren't interchangeable:
- IV (intravenous) drip. Administered in a clinic, often at much higher totals over a slow infusion. There's no vial-to-units calculation for you to do, and the safety warnings about IV glutathione for skin lightening apply most directly here.
- IM (intramuscular) and SubQ (subcutaneous) self-injection. A reconstituted vial drawn into an insulin syringe at the smaller 100–200 mg doses this page covers. The unit math here is for these routes.
If your plan is an IV drip, this tool doesn't apply; see our glutathione IV vs injection guide. Everything below assumes you're reconstituting a vial to self-inject.
How do you read glutathione units on an insulin syringe?
On a U-100 insulin syringe, 100 units = 1 mL, so a unit is a hundredth of a millilitre — the calculator converts your milligram dose into that unit mark. At a sensible ~200 mg/mL mix, a normal glutathione dose lands between about a quarter and a full barrel.
Glutathione doses are large enough that you'll almost always use a U-100 1 mL syringe; a 200 mg dose at 200 mg/mL is a full 100 units. The reconstitution syringe you use to add the water is separate and larger — for a 1200 mg vial you'll be drawing 6 mL, which needs a 5–10 mL syringe. The U-40 calibration exists but is rare; on it, the same volume reads as fewer units, so always confirm your barrel. The same mg-to-units logic underpins our general peptide dosage calculator for any other compound.
Where glutathione doses actually land on the syringe
Mixed the usual way at about 200 mg/mL, glutathione's 100–200 mg doses fall between roughly 50 and 100 units — comfortably inside one U-100 syringe. A dose only approaches or passes the top of the barrel if the vial is mixed unusually dilute.
Across our tracked glutathione reconstitutions the median draw is about 50 units, with the middle half running from 50 up to a full 100. The big-vial, big-water habit is what keeps those draws sensible.
The distribution sits in the usable middle-to-upper half of the barrel: a typical 100 mg dose is half a syringe, and a larger 200 mg dose fills it. A draw only exceeds one syringe if you've mixed the vial more dilute than usual (for example a 200 mg dose at 100 mg/mL), which the calculator still flags — but with the standard ~200 mg/mL mix it simply doesn't come up.
Glutathione reconstitution chart: units by vial and dose
This chart shows the concentration each vial makes at the common water volumes and the U-100 units for typical doses, so you can pick a setup that keeps your dose on a comfortable mark. For any other setup, use the calculator.
| Setup | Concentration | 100 mg | 150 mg | 200 mg |
|---|---|---|---|---|
| 600 mg + 3 mL | 200 mg/mL | 50 u | 75 u | 100 u |
| 600 mg + 2 mL | 300 mg/mL | 33 u | 50 u | 67 u |
| 1200 mg + 6 mL | 200 mg/mL | 50 u | 75 u | 100 u |
| 1200 mg + 3 mL | 400 mg/mL | 25 u | 37.5 u | 50 u |
The cleanest, most common setups are the 200 mg/mL mixes (600 mg + 3 mL or 1200 mg + 6 mL), where the whole 100–200 mg range fits one syringe. A stronger mix (more concentrated) shrinks the draw further but stings more. The most-searched single conversions, for a quick sanity check:
- 100 mg glutathione on a 200 mg/mL vial = 0.5 mL = 50 units.
- 150 mg glutathione on a 200 mg/mL vial = 0.75 mL = 75 units.
- 200 mg glutathione on a 200 mg/mL vial = 1.0 mL = 100 units (a full syringe, still one draw).
How many glutathione doses are in a vial, and what does each cost?
Doses per vial is vial milligrams ÷ your dose — and because glutathione comes in large 600–1200 mg vials, a single vial covers several injections. Dividing the vial price by that number gives a true cost per dose.
A 600 mg vial at a 100 mg dose yields 6 doses; a 1200 mg vial at 200 mg gives 6 as well. Across our tracked glutathione vials the median works out to roughly 6 doses per completed vial at about $8 per dose.
| Economics output | How it's computed | Example (600 mg vial, 100 mg dose, $48 vial) |
|---|---|---|
| Doses per vial | vial mg ÷ dose mg | 6 doses |
| Cost per dose | vial price ÷ doses per vial | $8.00 |
| Approx. weekly cost | cost per dose × doses per week | $16.00 (2×/week) |
| Approx. monthly cost | weekly × 4.3 | ~$69 |
For a full plan rather than a single calculation, see our glutathione dosing guide.
mg, units, and mL: keeping the numbers straight
Milligrams measure the glutathione; millilitres and units measure the liquid you draw. Glutathione is dosed in large milligram amounts, so the trap isn't a unit mix-up — it's matching the water volume to a big vial. Here is a 100 mg dose expressed four ways on a 200 mg/mL vial:
| Label | Value | What it describes |
|---|---|---|
| Dose in milligrams | 100 mg | mass of glutathione |
| Volume to draw | 0.5 mL | liquid volume |
| Units to draw (U-100) | 50 units | liquid volume on the syringe |
| Share of one barrel | half | how much of the syringe |
Why concentration is the number that actually matters
Concentration (mg/mL) is the hinge of every glutathione calculation — and for glutathione it sets both the unit mark and how thick (and stinging) the injection is. It connects the milligrams in the vial to the units on the syringe.
Concentration is an exchange rate between milligrams of glutathione and millilitres of liquid. A 200 mg/mL vial trades every 1 mL for 200 mg; your dose occupies a volume set by that rate, and the syringe scale turns it into a unit mark. Mix a big vial with a matching big volume of water and you land near 200 mg/mL, where doses read cleanly and the injection is tolerable; under-fill it and you get a small but thick, stinging draw. That link between concentration and comfort is what makes the water choice matter for glutathione beyond the arithmetic.
It's also why you can never compare unit numbers across reconstitutions. "Draw 50 units" means 100 mg on a 200 mg/mL vial but 200 mg on a 400 mg/mL vial — double. Every unit instruction online is valid only for that exact vial and water volume.
How to reconstitute glutathione, step by step
Add the bacteriostatic water slowly down the vial wall, swirl gently until clear, and never shake. Glutathione powder can be bulky in a large vial; give it time to dissolve.
- Calculate first. Use the tool above to set your water volume and target unit mark — aim for about 200 mg/mL so a normal dose fits one syringe.
- Room temperature, then swab both stoppers with a fresh alcohol swab.
- Draw your measured water into a reconstitution syringe — about 3 mL for a 600 mg vial, 6 mL for a 1200 mg vial.
- Add slowly down the wall of the glutathione vial, onto the glass rather than the powder.
- Swirl, don't shake until the solution is completely clear.
- Inspect. Clear and particle-free, or don't use it.
- Label and refrigerate at 2–8 °C, then dose at the unit mark the calculator gave you.
Common glutathione reconstitution mistakes
- Under-filling a big vial. Pouring 1–2 mL into a 600 mg vial makes a 300–600 mg/mL concentrate that stings hard — match the water to the vial (about 3 mL) for ~200 mg/mL.
- Confusing an IV drip with a self-injection. They use different amounts; this tool is for self-injection.
- Over-diluting. Going far past 200 mg/mL can push a big dose toward the top of the barrel; stay near 200 mg/mL.
- Reading "units" as milligrams, wrong syringe scale (U-40 vs U-100), and not labeling the date.
Glutathione vial sizes, supplies, and water
Injectable glutathione comes in large vials — commonly 600 mg and 1200 mg, with 1500 mg and 2400 mg also sold — reconstituted with a matching amount of water to land near 200 mg/mL. Pick the size that suits how often you inject.
- 600 mg — the most-logged size; in 3 mL it's 200 mg/mL, where a 100 mg dose is 50 units and the vial gives about 6 doses.
- 1200 mg — fewer reconstitutions, more doses; in 6 mL it's also 200 mg/mL, or in 3 mL a stronger 400 mg/mL for the smallest draws.
A quick supplies checklist: the lyophilized glutathione vial, bacteriostatic water (sterile water with 0.9% benzyl alcohol) as the diluent, a larger reconstitution syringe (5–10 mL, since you're adding a lot of water), a U-100 1 mL insulin syringe for the dose, alcohol swabs, and a marker for the date.
How long does reconstituted glutathione last?
Once mixed, glutathione is less stable than the dry powder, and there's no validated injectable shelf life — the common ~28-day refrigerated convention is a usage habit, not data. Glutathione is especially prone to oxidation in solution, so handle it gently.
Keep a mixed vial in the refrigerator at 2–8 °C, dark, and never frozen; discard it if it turns cloudy, discolors (yellowing suggests oxidation), or shows particles. In our usage data the median reconstituted glutathione vial is finished in about 16 days. For the deeper science, see our peptide storage and stability guide.
What the evidence and regulators say about glutathione dosing
Injectable and IV glutathione is not FDA-approved for skin lightening, and multiple regulators warn it is unsafe and unstandardized for that use — so the dosing figures here are community and clinic convention, paired with a real safety caveat. We give them only so you know what to enter into the calculator.
Glutathione is the body's main antioxidant tripeptide (glutamate-cysteine-glycine). Its use as an injected skin-lightening agent is widespread in parts of Asia but unapproved, and national regulators have warned against it: the FDA Philippines flagged the unsafe use of glutathione as a skin-lightening agent (FDA Philippines, 2019, "Advisory No. 2019-182: Unsafe Use of Glutathione as Skin-Lightening Agent", retrieved 2026-06-16), and the Department of Health reiterated the concerns about off-label injectable glutathione for whitening (DOH Philippines, 2024, "On the Off-Label Drug Use of Injectable Glutathione as a Skin Whitener", retrieved 2026-06-16). The dermatology literature describes the evidence for systemic glutathione whitening as weak and the safety profile as uncertain (PubMed, 2016, Sonthalia et al., "Glutathione as a skin whitening agent: facts, myths, evidence and controversies", retrieved 2026-06-16; PubMed, 2019, "Systemic glutathione as a skin-whitening agent in adults," systematic review, retrieved 2026-06-16; NCBI/PMC, 2025, "Safety and efficacy of glutathione supplementation for skin lightening", retrieved 2026-06-16). There is no FDA-approved injectable label or standard dose. Treat the common 100–600 mg figures as a community and clinic convention to calculate from if you choose to, not as evidence-based guidance.
How precise does your glutathione draw need to be?
Because glutathione draws are moderate to large (often 50–100 units), they're easy to measure accurately — a unit or two of error is a small fraction of the dose. On a 200 mg/mL vial, one U-100 unit is 2 mg, negligible against a 100 mg dose. Precision is rarely the concern with glutathione; getting the concentration right (so the injection is tolerable and a normal dose fits one syringe) matters more.
Frequently asked questions
Sources
Factual claims (regulatory status, safety, evidence) are sourced below. Dose values in examples are not recommendations; injectable glutathione dosing is community and clinic convention, not validated. ProtocolPlus usage figures are first-party app data.
- FDA Philippines (2019) — Advisory No. 2019-182: Unsafe Use of Glutathione as a Skin-Lightening Agent. https://www.fda.gov.ph/fda-advisory-no-2019-182-unsafe-use-of-glutathione-as-skin-lightening-agent/ — retrieved 2026-06-16.
- DOH Philippines (2024) — On the Off-Label Drug Use of Injectable Glutathione as a Skin Whitener. https://doh.gov.ph/press-release/on-the-off-label-drug-use-of-injectable-glutathione-as-a-skin-whitener/ — retrieved 2026-06-16.
- PubMed (2016) — Sonthalia S, et al., Glutathione as a skin whitening agent: facts, myths, evidence and controversies, Indian J Dermatol Venereol Leprol. https://pubmed.ncbi.nlm.nih.gov/27088927/ — retrieved 2026-06-16.
- PubMed (2019) — Systemic glutathione as a skin-whitening agent in adults (systematic review). https://pubmed.ncbi.nlm.nih.gov/32373172/ — retrieved 2026-06-16.
- NCBI / PMC11862975 (2025) — Safety and efficacy of glutathione supplementation for skin lightening: a narrative review. https://pmc.ncbi.nlm.nih.gov/articles/PMC11862975/ — retrieved 2026-06-16.
About this guide. Written by Jordan Vance, peptide and biohacking researcher (placeholder, replace before publish), and medically reviewed by Dr. Maya Ellison, MD, biochemistry (placeholder, replace before publish), for the ProtocolPlus Research Team. This calculator and article are educational and not medical advice.