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peptide guide · metabolic · trending 88

Tirzepatide

MounjaroZepbound

Dual GLP-1 / GIP receptor agonist. FDA-approved as Mounjaro (T2D) and Zepbound (obesity).

category
metabolic
half-life
~5 days
research dosing
Research literature cites 2.5–15 mg weekly subcutaneous, escalated over 16+ weeks.
vendors stocking
2
§ 01

Research notes

Mechanism

Tirzepatide hits two incretin receptors: GLP-1 and GIP. The dual agonism produces a larger weight-loss and glycemic effect than GLP-1 monotherapy at comparable doses. Marketed as Mounjaro for type 2 diabetes and Zepbound for obesity by Eli Lilly.

Research dosing

Standard escalation schedule starts at 2.5 mg weekly, increasing every four weeks through 5, 7.5, 10, 12.5, and 15 mg. The Surmount trials used this schedule with optimal weight-loss outcomes at the 10–15 mg range.

Vendor coverage

Tirzepatide is the most-stocked compound across the audited vendor pool — every major research vendor lists it, which makes it the natural starting point for cross-vendor purity comparisons. Cross-lab agreement on tirzepatide tends to be tight (<1 percentage point) at the top vendors and looser (2–4 points) at the bottom of the pack.

§ 02

What it's researched for

  • weight loss
  • type 2 diabetes
§ 03

Where to source it

top 3 by compositeSee all 2 vendors
vendor · ships us

Limitless Life Nootropics

public-data

Cleanest COAs we've tested, fast US shipping, premium pricing.

91/100
VIAL15
15% off first order
copy
2d ship · last test 2026-04-15T00:00:00.000ZRead audit →
vendor · shut down

Amino Asylum

closed

Permanently shut down June 2025 following an FDA raid. Do not order.

0/100
0d ship · last test 2026-03-28T00:00:00.000ZRead audit →
§ 04

Sources

  1. [01]Tirzepatide once weekly for the treatment of obesity (NEJM)
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