Research & Guides · Weight Loss

Weight Loss, written by clinicians.

22 physician-reviewed articles on weight loss — what each compound does at the cellular level, who it's for, and what the evidence does and doesn't establish.

Articles

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9 Min

Updated

2026

A single water droplet suspended above fading concentric ripples, a visual analogy for tirzepatide clearing the system

Featured · Weight Loss

How Long Does Tirzepatide Stay in Your System? The Label Arithmetic

How long does tirzepatide stay in your system? About 25 to 30 days after a final dose, derived from the roughly 5-day half-life on the Zepbound and Mounjaro labels.

Dr. Richard Dentico, MD · 12 min read

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A glass hourglass with dark sand running, on a dark tabletop against a pale textured wall

Weight Loss · 12 min read

How Long Does It Take for Tirzepatide to Start Working? What Trials Measured

How long does it take for tirzepatide to start working? Blood levels peak 8 to 72 hours after an injection. Trials measured lower food intake at week 3 and weight loss by week 12.

A Protocol MD compounded tirzepatide vial standing on a glass shelf inside an empty refrigerator

Weight Loss · 11 min read

How Long Does Tirzepatide Last in the Fridge? What the Labels Say

How long does tirzepatide last in the fridge? Zepbound and Mounjaro keep to their printed expiration date at 36°F to 46°F. A compounded vial follows the beyond-use date on its own label.

An unoccupied analog bathroom scale on a dark floor with the needle at rest

Weight Loss · 14 min read

Why Am I Not Losing Weight on Tirzepatide? A Physician's Guide

Why am I not losing weight on tirzepatide? Usually the timeline, a noisy scale, or appetite rising to meet the weight you already lost. What a physician reviews when the scale stops.

An unlabeled glass medication vial and a syringe on a blue background

Weight Loss · 10 min read

Is Zepbound the Same as Tirzepatide? Brand, Generic and Compounded

Is Zepbound the same as tirzepatide? Zepbound is a brand name for tirzepatide. Mounjaro is the same molecule for type 2 diabetes. Compounded tirzepatide is a different product.

Two unbranded injection pens illustrating a comparison of Zepbound and Wegovy

Weight Loss · 12 min read

Zepbound vs Wegovy: How the Two Weight-Loss Drugs Compare

Zepbound vs Wegovy: Zepbound is tirzepatide, Wegovy is semaglutide. They are approved for different conditions, and one leads on average weight loss.

Weight Loss · 11 min read

Tirzepatide Side Effects: What to Expect and What to Watch For

Most tirzepatide side effects are gastrointestinal and settle with time. Here's the full picture — common effects, the serious ones, the eye signal, and what compounded formulations add.