Retatrutide Cost in Canada: Price Per mg, Per Vial and Per Month (2026)

Retatrutide in Canada costs roughly $6.50 to $8.00 per milligram from a domestic research supplier, which works out to about $79 for a 10 mg vial, $149 for 20 mg and $199 for 30 mg. Cost per milligram — not the sticker price on the vial — is the only figure that lets you compare one Canadian supplier against another, because vial sizes, purity, overfill and shipping terms all differ. This guide breaks down what retatrutide actually costs in Canada in 2026, how to calculate your own cost per millilitre and per unit, what the hidden line items are, and why a price that looks too good usually is.

Retatrutide is supplied in Canada for laboratory research use only. It is not approved by Health Canada for therapeutic use, injection, ingestion, or any form of human or animal application. Nothing below is dosing guidance or a claim about clinical outcomes; the dose figures cited are published clinical-trial parameters used here purely as arithmetic inputs for budgeting a research protocol.

How much does retatrutide cost in Canada?

As of 2026, retatrutide from a Canadian research supplier typically lands between .50 and .00 per milligram CAD. Current Red Leaf Research Labs pricing sits inside that band:

Two things stand out immediately. First, the per-milligram cost falls as vial size rises — the 30 mg vial is roughly 16% cheaper per milligram than the 10 mg. Second, the gap between sale and regular pricing is wide enough that the same product can look like a very different deal depending on the week you check.

That is the whole problem with “how much does retatrutide cost” as a question. The answer is never one number. It is a range that moves with vial size, supplier, purity verification, and whether the price you are quoted includes the things you need to actually use the vial.

Retatrutide price by vial size: 10 mg, 20 mg and 30 mg

Canadian suppliers generally stock retatrutide in three vial sizes. Each is the same compound; what changes is the mass of lyophilised powder in the vial and, consequently, how much bacteriostatic water you add and how many research doses the vial yields.

10 mg vials

The 10 mg vial is the entry point. It carries the highest cost per milligram of the three, which is normal — you are paying a fixed cost for the vial, the stopper, the

Lyophilization run, the lab report and the cold-chain packaging regardless of how much peptide is inside. Spread that fixed cost over 10 mg instead of 30 mg and the per-milligram figure rises.

It is the right size for a short protocol, for a first order from a supplier you have not used before, or where storage constraints make a smaller reconstituted volume preferable. It is the wrong size if you already know you will run through 30 mg, because you will pay roughly $37 more in total to get the same mass.

20 mg vials

The 20 mg vial is the most commonly ordered size in Canada and usually the best balance between unit economics and practical handling. At $149 it works out to $7.45 per milligram — about 6% cheaper per milligram than the 10 mg — while keeping the reconstituted volume small enough to be used within a reasonable window after mixing.

30 mg vials

The 30 mg vial gives the lowest cost per milligram at $6.63. The trade-off is time: once reconstituted, a peptide solution has a finite usable life under refrigeration, and a larger vial means a longer period between reconstitution and finishing the vial. For a protocol running at lower weekly quantities, the saving per milligram can be partly offset by stability considerations over the longer draw-down period.

The arithmetic to remember: a 30 mg vial only saves you money if you use the whole vial. Buying the largest size and discarding a third of it is more expensive per milligram consumed than buying two 10 mg vials.

Cost per milligram is the only number that compares suppliers

Vendor pricing pages are built to be hard to compare. One lists a 5 mg vial, another a 15 mg, a third bundles bacteriostatic water into the price and a fourth charges separately for it. Reduce everything to cost per milligram and the comparison becomes trivial:

Cost per mg = (vial price + shipping share + consumables) ÷ mg in vial

Run that formula across every supplier on your shortlist before you look at anything else. A $99 vial is not cheaper than a $149 vial if the first is 10 mg ($9.90/mg) and the second is 20 mg ($7.45/mg). This one calculation resolves most of the confusion in the Canadian market, and it is the reason “cheapest retatrutide in Canada” is a misleading search — the cheapest vial is very rarely the cheapest milligram.

Two adjustments make the comparison honest:

• Amortise shipping. If a supplier charges $25 flat shipping and you order one 20 mg vial, that is $1.25/mg of real cost added — a 17% increase. If free shipping kicks in above a threshold, the effective per-milligram cost of a larger order drops sharply.
• Include consumables you must buy anyway. Bacteriostatic water is not optional. If one supplier includes it and another does not, the included version is genuinely cheaper.

What “retatrutide price per month” actually means

Monthly cost is one of the most searched retatrutide questions in Canada, and it is the one most often answered badly, because monthly cost is not a property of the product. It is a property of your protocol. The formula is:

Monthly cost = mg used per week × 4.33 × cost per mg

To make that concrete without inventing numbers, we can use the dose arms from the published Phase 2 obesity trial of retatrutide (Jastreboff et al., New England Journal of Medicine, 2023), which randomised 338 adults across once-weekly arms of 1 mg, 4 mg, 8 mg and 12 mg over 48 weeks, with escalation beginning at 2 mg or 4 mg. Those figures are trial parameters, not recommendations — they are used here only because they define the realistic range of weekly quantities a research protocol might model.

Applying the formula at Red Leaf’s 30 mg cost per milligram of $6.63:

The spread is the point. Monthly retatrutide cost in Canada is not one figure — across the trial’s own dose range it varies by more than tenfold, from under $30 to nearly $400. Anyone quoting a single monthly price for retatrutide is either assuming a protocol they have not told you about, or guessing.

Note also how much the vial size choice matters at scale. At the 12 mg arm, buying 30 mg vials instead of 20 mg vials saves roughly $42 per month — about $500 over a year-long protocol.

The costs people forget: water, syringes, pens and shipping

The vial price is not the landed cost. Four line items are routinely left out of comparisons:

Bacteriostatic water

Lyophilised peptide is a powder. It cannot be used until it is reconstituted, and reconstitution requires bacteriostatic water — sterile water containing 0.9% benzyl alcohol as a preservative, which is what allows a vial to be entered more than once. Plain sterile water is not equivalent and does not carry the same multi-entry handling profile.

Expect $10 to $24 depending on volume and brand. A 30 ml Pfizer bacteriostatic water vial runs and will reconstitute a substantial number of peptide vials, so the per-vial share of that cost is small — usually well under . Budget it, but it is not the line item that moves your total.

Syringes

U-100 insulin syringes are the standard tool for measuring reconstituted peptide, because the 100-unit scale maps cleanly onto millilitre volumes. Costs are minor but non-zero and worth including for completeness.

Peptide pens

A reusable research pen adds roughly $99 as a one-time cost. Whether that is worth it depends entirely on protocol length. Amortised across a single 20 mg vial it is a 66% cost increase; amortised across a year it is negligible. Pens improve volumetric repeatability over syringes, which matters more for small-volume work.

Shipping

This is the line item that most often changes which supplier is actually cheapest. Red Leaf ships express Canada-wide free on orders over $350; below that a shipping charge applies. On a single $149 vial, a $25 shipping fee raises your true cost from $7.45/mg to $8.70/mg — a 17% increase that no pricing page shows you.

The practical consequence: consolidating orders above a free-shipping threshold is usually the single largest percentage saving available on retatrutide in Canada, larger than the discount from moving up a vial size.

How to calculate your own cost per dose

Once you know cost per milligram, converting to cost per research dose is straightforward volumetric arithmetic. Reconstitution does not change the mass of peptide in the vial — it only changes its concentration.

Common reconstitution ratios:

On a U-100 insulin syringe, 100 units equals 1 ml. So at a 10 mg/ml concentration, every 10 units drawn represents 1 mg of peptide — and at $6.63 per milligram, every 10 units represents about 66 cents of product.

That last conversion is the useful one. It turns an abstract vial price into a figure you can track per draw. Our peptide reconstitution calculator runs this arithmetic for any vial size and water volume, including the cost-per-unit figure.

Why retatrutide prices vary so much between Canadian suppliers

Two Canadian sites can list retatrutide 20 mg at $99 and $179. The compound is the same molecule. The difference is almost never the peptide itself — it is everything wrapped around it.

Purity and third-party testing

Independent HPLC and mass-spectrometry analysis costs money per batch. A supplier who tests every lot through an independent laboratory and publishes the report carries a cost that a supplier shipping untested material does not. Red Leaf publishes Janoshik Analytics reports with a verification link on each product page precisely so this cost is visible rather than assumed.

The corollary is uncomfortable but true: an unusually low price per milligram is frequently the testing line item being removed.

Actual mass in the vial

A vial labelled 20 mg does not necessarily contain 20 mg. Underfill is one of the more common quality failures in the grey research market, and it is invisible without a quantitative lab report. A vial containing 16 mg sold as 20 mg at $149 is not $7.45/mg — it is $9.31/mg. Your cost-per-milligram calculation is only as good as the mass figure you feed it, which is the practical argument for buying only where a quantitative COA exists.

Cold chain and storage

Lyophilised peptide is reasonably robust, but temperature-controlled storage and insulated shipping are real costs. Suppliers who skip them can price lower.

Domestic versus imported

Product shipping from within Canada avoids customs exposure, international transit times and the risk of a package being held. Overseas suppliers frequently quote lower headline prices; the cost of a seized or degraded shipment is not in that quote.

What a very low retatrutide price usually means

If you find retatrutide well below $5 per milligram in Canada, one of a small number of things is generally true. It is worth knowing which, rather than assuming you found a deal:

• No independent testing. The most common explanation. No third-party COA, or a COA that belongs to a different batch than the one shipping.
• Underfilled vials. The price per labelled milligram is low; the price per actual milligram is not.
• Purity below the stated figure. A 92% pure vial sold as 99% is 7% less product than you paid for, before considering what the remaining 8% consists of.
• Direct overseas dropship. Lower cost base, but transit time, temperature exposure and customs risk transfer to you.
• Genuine promotional pricing. This does exist. It is distinguishable from the above because the supplier will still show you a current, batch-matched lab report.

The verification question that settles it is simple: can you show me the third-party report for the batch I will receive, and does the batch number on it match the vial? A supplier who can answer that is worth comparing on price. One who cannot is not in the comparison at all.

Retatrutide compared with other GLP-1 research compounds on cost

Retatrutide is a triple agonist, targeting the GIP, GLP-1 and glucagon receptors. Tirzepatide is a dual GIP/GLP-1 agonist and semaglutide a single GLP-1 agonist. Cost per milligram differs substantially across the three, but so do the milligram quantities used in their respective published protocols — which means cost per milligram alone does not tell you relative protocol cost.

Tirzepatide carries a lower cost per milligram than retatrutide, which reflects a longer production history and wider supply rather than anything about the compounds’ relative properties. Whether that translates into a lower protocol cost depends on the weekly quantities in the protocol being modelled — a comparison covered in our comparison of semaglutide, tirzepatide and retatrutide.

Why retatrutide is not sold at pharmacy prices in Canada

Retatrutide has not been approved by Health Canada or the FDA for any indication. It remains an investigational compound in Eli Lilly’s clinical development programme. There is no approved retatrutide product, no DIN, no pharmacy stock and no public or private drug-plan coverage.

This is the structural reason retatrutide pricing looks nothing like pharmacy GLP-1 pricing. An approved product carries regulatory approval costs, distribution margins, pharmacy dispensing fees and manufacturer pricing strategy. Research-grade material carries synthesis, testing, storage and shipping — a shorter cost stack.

It also means the price can move quickly. Investigational compounds have no price regulation, and supply is not guaranteed. If approval status changes, the entire pricing structure described in this article changes with it. For the current regulatory picture and how domestic research supply works in practice, see our guide on where to get peptides in Canada.

Does buying more retatrutide actually save money?

Bulk buying is usually framed as a discount question. In the Canadian retatrutide market it is mostly a shipping question, and the arithmetic is worth doing rather than assuming.

Take a single 20 mg vial at $149 with $25 shipping. Landed cost is $174, or $8.70/mg. Now take two 30 mg vials at $199 each: $398, which clears the $350 free-shipping threshold. Landed cost is $398 for 60 mg — $6.63/mg. That is a 24% reduction in real cost per milligram, and only about a third of it comes from the larger vial size. The rest is shipping disappearing.

The caveat is the one from earlier: this only holds if the material is used. Buying 60 mg to capture a shipping saving and discarding 20 mg of it returns you to $9.95/mg — worse than the single small vial you were trying to improve on. Bulk purchasing is a saving on consumed milligrams, never on ordered ones, and reconstituted solution has a finite usable life under refrigeration regardless of how much you bought.

The practical rule: size the order to the protocol first, then check whether adding consumables you need anyway — bacteriostatic water, syringes — carries the order over the free-shipping threshold. That is often a cheaper way to clear $350 than adding peptide you will not use.

Comparing suppliers on more than price

Cost per milligram is the right primary filter, but it should be applied only to suppliers that pass a verification screen first. Before you compare numbers, confirm:

• Batch-matched third-party lab reports. Not a generic certificate — a report from an independent lab, tied to the batch you will receive, with a verification link you can check at the laboratory’s own site.
• Quantitative mass, not just purity. Purity percentage without a mass figure does not tell you whether the vial is filled correctly.
• Canadian domestic shipping. Removes customs risk and shortens transit.
• A real business identity. A named owner, a reachable phone number, and a physical presence.
• Transparent stock status. Suppliers who list everything as permanently in stock frequently are not holding it.

Our checklist on how to spot irresponsible peptide suppliers in Canada covers the verification process in more detail.

Frequently asked questions

How much does retatrutide cost in Canada?

Retatrutide costs approximately $6.50 to $8.00 per milligram in Canada as of 2026. At Red Leaf Research Labs, a 10 mg vial is $79, 20 mg is $149 and 30 mg is $199 CAD.

What is retatrutide’s price per milligram?

Cost per milligram falls as vial size rises: $7.90/mg for a 10 mg vial, $7.45/mg for 20 mg and $6.63/mg for 30 mg. Cost per milligram is the correct basis for comparing suppliers, because vial sizes differ.

How much does retatrutide cost per month?

Monthly cost depends entirely on the weekly quantity a protocol uses. Using the published Phase 2 trial’s dose arms as arithmetic inputs and a cost of $6.63/mg, monthly cost ranges from about $29 at the 1 mg weekly arm to about $345 at the 12 mg arm. There is no single monthly price for retatrutide.

Is retatrutide cheaper than tirzepatide?

No. Tirzepatide is currently less expensive per milligram — roughly $4.95/mg for a 20 mg vial versus $6.63/mg for retatrutide 30 mg. Retatrutide is a newer compound with a shorter production history, which is reflected in its price.

Why is retatrutide so much cheaper than pharmacy GLP-1 medications?

Retatrutide is not an approved medication in Canada and is not sold through pharmacies. Research-grade material carries synthesis, testing, storage and shipping costs but none of the regulatory approval, distribution margin or dispensing costs built into an approved pharmaceutical product’s price.

How much bacteriostatic water do you add to a 10 mg retatrutide vial?

Adding 2 ml of bacteriostatic water to a 10 mg vial produces a 5 mg/ml concentration, where 20 units on a U-100 syringe equals 1 mg. Adding 1 ml produces 10 mg/ml, where 10 units equals 1 mg. Reconstitution volume does not change the total peptide mass or the cost per milligram.

Does bacteriostatic water cost extra?

Usually yes. Bacteriostatic water runs $10 to $24 depending on volume, with a 30 ml Pfizer vial at $24. Because one bottle reconstitutes many peptide vials, the per-vial share is typically under .

What does a peptide pen cost, and is it worth it?

A reusable research pen is about $99 as a one-time cost. It is poor value amortised over a single vial and good value over a long protocol, where it improves volumetric repeatability compared with a syringe.

Does shipping affect the real cost of retatrutide?

Significantly. A $25 shipping charge on a single $149 vial raises the effective cost from $7.45/mg to $8.70/mg. Red Leaf ships express Canada-wide free on orders over $350, so consolidating orders above that threshold is often the largest available saving.

Is retatrutide approved in Canada?

No. Retatrutide is not approved by Health Canada or the FDA for any indication and remains an investigational compound. It is supplied for laboratory research use only, with no DIN, no pharmacy availability and no drug-plan coverage.

Why is retatrutide cheaper from some Canadian suppliers than others?

The main drivers are independent batch testing, actual mass in the vial, cold-chain handling, and whether the product ships domestically or from overseas. A price far below market usually reflects one of those costs being removed rather than a better deal.

How do I know a cheap retatrutide vial is genuine?

Ask for the third-party laboratory report for the specific batch you will receive, confirm the batch number matches the vial, and verify the report at the testing laboratory’s own site rather than trusting a PDF hosted by the seller.

What is the difference between 10 mg, 20 mg and 30 mg vials?

Only the mass of lyophilised peptide inside. Larger vials cost less per milligram but take longer to consume after reconstitution, which is a stability consideration rather than a cost one.

The short version

Retatrutide in Canada costs $6.63 to $7.90 per milligram depending on vial size, with the 30 mg vial the most economical per milligram and the 10 mg the least. Monthly cost is not a fixed figure — it is weekly quantity multiplied by cost per milligram, and across the published trial’s own dose range that spans roughly $29 to $345. Shipping and vial size move your real cost more than most people expect, and a price meaningfully below market almost always reflects a removed cost rather than a better one. Reduce every option to cost per milligram, apply it only to suppliers with batch-matched independent lab reports, and the Canadian retatrutide market becomes straightforward to compare.

View current retatrutide pricing and batch lab reports →

Research use only. Retatrutide supplied by Red Leaf Research Labs is not approved by Health Canada for cosmetic application, therapeutic treatment, injection, ingestion, or any form of human or animal use. No claims are made regarding clinical outcomes, safety or efficacy. Clinical-trial dose figures cited in this article are published research parameters reproduced for cost-modelling purposes only and are not guidance. Pricing is current at the time of publication and subject to change.

Reference: Jastreboff AM, et al. Triple–Hormone-Receptor Agonist Retatrutide for Obesity — A Phase 2 Trial. New England Journal of Medicine, 2023.