Tirzepatide - Generic Peptides

Buy Tirzepatide by Generic Peptides at XSteroids. Tirzepatide is the dual incretin peptide sold as the prescription medicines Mounjaro and Zepbound. The brand supplies it as lyophilized powder, with 2 mg, 5 mg and 10 mg fills available. This page covers the two receptors it touches, the trial numbers, how each vial size calculates and the hard difference between a licensed medicine and a research vial.

One point is repeated by regulators and should stay in mind: an unapproved version of this class has not been checked for safety, effectiveness or quality, and the vial on this page carries no approved label. The notes below are educational, not medical advice.

What Tirzepatide Is and What the Pack Holds

A tirzepatide order is a single glass vial of white lyophilized powder, listed at 2 mg, 5 mg or 10 mg. The milligram figure on the option you pick is the total in that vial. Bacteriostatic water is a separate item and is not included. The powder has to be dissolved before any laboratory use.

The active substance is a 39 amino acid linear peptide developed by Eli Lilly, and it is chemically modified with a fatty diacid chain attached through a linker. That chain gives it strong albumin binding and a long duration of action, so the molecule behaves like a weekly injection. Generic Peptides prints the substance and the milligram figure on the pack, yet no filler breakdown and no independent potency testing are in circulation, so the page reproduces the supplier documentation and nothing beyond it.

The distinction that matters is the product form. Mounjaro and Zepbound are approved manufactured products of the same molecule with their own labels, dosing and safety data. The vial here is a research format that shares the active substance but none of that regulatory status.

How Tirzepatide Works on Two Receptors

Two receptors, not one

Tirzepatide works as a GIP analogue and, in parallel, as an agonist at the GLP-1 receptor. Binding data place its GIP receptor affinity above its GLP-1 affinity, and both receptors signal through cyclic AMP after the peptide binds. Activation of both sharpens glucose-dependent insulin release, slows gastric emptying and lowers food intake, and GIP adds its own contribution to insulin secretion and fat handling.

The two signals overlap, which is why the appetite effect is described as stronger than with a GLP-1 peptide alone. The mechanism is still the same appetite and glucose story, not tissue building.

Once-weekly action

The albumin-binding side chain is the reason a single weekly injection is enough. In people with obesity the half-life is around five to six days, and the apparent clearance is low, so the effect accumulates over weeks rather than appearing after one dose. That is why the full picture only appears after months on a stepped dose.

What to Expect from Tirzepatide Research

The human numbers come from the SURMOUNT programme. In SURMOUNT-1, a 72 week study of 2539 adults with obesity but without diabetes, average weight fell by about 15 percent at 5 mg, 19.5 percent at 10 mg and 20.9 percent at 15 mg, against 3.1 percent on placebo, and around half of the highest dose group lost at least 20 percent of body weight. Earlier diabetes trials reported similar directional effects on blood glucose.

Those are study results for an approved product, not a promise for a vial. The timeline is again long: the dose is stepped up by 2.5 mg no more often than every four weeks, and the weight curve keeps falling through the second half of the trial. Gut side effects are most common during the increases.

Stopping is where expectations usually break. In the SURMOUNT-4 withdrawal study, people who switched to placebo after open-label treatment regained about 14 percent of body weight over 52 weeks, while those who continued lost about 5.5 percent more. The gap between the two groups was close to 19 percentage points, and a post hoc analysis found that most who stopped regained more than a quarter of the weight they had lost. Rebound is the rule, not the exception.

Tirzepatide Vial Sizes, Dosing and Reconstitution

Three fill sizes

One millilitre of bacteriostatic water turns the 2 mg pack into 2 mg per ml, the 5 mg pack into 5 mg per ml and the 10 mg pack into 10 mg per ml. Working at 5 mg per ml, 2.5 mg occupies 0.5 ml, or 50 units on a U-100 syringe, while 1 mg occupies 20 units. Doubling the water to 2 ml halves the concentration and doubles every volume. Let the water run down the wall and rotate the vial; shaking is not part of the method.

What a 5 mg vial covers

At the 2.5 mg starting dose that the label uses, a 5 mg vial covers two weeks and a 10 mg vial four weeks. At the 15 mg top weekly dose a single 10 mg vial does not even reach one full injection, a reminder that these are research pack sizes rather than a treatment supply.

Label dose ladder

The approved products start at 2.5 mg weekly for four weeks, then increase by 2.5 mg no more often than every four weeks, up to 15 mg weekly. For obstructive sleep apnoea the approved dose is 10 or 15 mg weekly. Those steps belong to manufactured pens and have no approved equivalent for a research vial.

Stacking Tirzepatide with Metabolic Peptides

Published research tested tirzepatide on its own, with a lifestyle programme in every arm, so there is no validated combination schedule for a research vial. Related molecules in the same catalog include Semaglutide 5 mg, the single-receptor GLP-1 peptide, and Retatrutide 5 mg, which adds a glucagon receptor to the same two. Neighbouring fat loss research includes AOD 9604 2 mg, HGH Frag 176-191 5 mg and Adipotide 10 mg, each with a different mechanism and its own risk profile. Tesamorelin 5 mg and NAD+ 250 mg round out the metabolic shelf. None of these combinations has been tested with tirzepatide.

Recovery and Post-Cycle Context for Tirzepatide

There is no post-cycle protocol for a dual incretin research vial. The class does not suppress the hormonal axis the way anabolic compounds do, so classic recovery does not apply. What does apply is the withdrawal pattern described above: appetite returns, intake rises and weight comes back unless eating and activity are managed deliberately. That is a behavioural and metabolic rebound, not a recovery failure, and the studies are consistent about it.

Tirzepatide Side Effects and Safety Notes

Reported effects

The most frequently reported complaints are gastrointestinal: nausea, vomiting, diarrhoea, constipation and upper abdominal discomfort, all scaling with dose. In the label data those reactions were reported by about 56 percent of treated people against 30 percent on placebo, and discontinuation because of side effects ran from roughly 5 to 7 percent depending on dose. Gallbladder disease and a small rise in resting heart rate are also described.

Label warnings

A personal or family history of medullary thyroid cancer or MEN-2 rules the approved products out, and a boxed warning covers thyroid C-cell tumours seen in rodents. During 2026 regulators tightened pancreatitis warnings for the dual incretin class.

Anti-doping status

GLP-1 agonism is not prohibited in sport and no therapeutic use exemption is needed, but WADA tracks the class through its monitoring programme, so the position could change. No prohibition is currently published.

Storage of the Tirzepatide Vial

The powder belongs at 2 to 8 C, away from light, and a freezer is acceptable for long term keeping. Mixed material stays at 2 to 8 C and is finished inside roughly four weeks; it should not go into a freezer. None of this comes from a label, because no label exists for a research vial: these are the conventions laboratories work to.

Why Buy Tirzepatide Vials from XSteroids?

Tirzepatide from Generic Peptides reaches you as a labelled research vial, with 2 mg, 5 mg or 10 mg options and the pack details set out above. Payment goes through an encrypted checkout, with US domestic delivery in 3 to 6 days and international shipping in 12 to 26 days. Because the molecule is also a licensed medicine, we spell out which numbers come from approved labels and which product form you are actually buying.