Blog
Updates and research notes.
Semaglutide vs Survodutide: 14.9% vs 18.7% Weight Loss Compared
Last updated · 15 min read · By David Chen, MD, PhD
Tirzepatide vs Survodutide: 20.9% vs 18.7% Weight Loss Compared
Last updated · 15 min read · By David Chen, MD, PhD
How Long Does Retatrutide Take to Work? Onset, Steady State, and Real Results
Last updated · 12 min read · By David Chen, MD, PhD
Retatrutide Before and After: What the Trial Data Says Actually Changes
Last updated · 14 min read · By David Chen, MD, PhD
Retatrutide Results at 1 Month: What the Trial Data Actually Says
Last updated · 13 min read · By David Chen, MD, PhD
Retatrutide Results: What the Trial Data Actually Shows, by Dose
Last updated · 11 min read · By David Chen, MD, PhD
Retatrutide Dizziness: Why It Happens and How to Manage It
Last updated · 13 min read · By David Chen, MD, PhD
Retatrutide Headache: Why It Happens and How to Manage It
Last updated · 13 min read · By David Chen, MD, PhD
Retatrutide Hair Loss: Why It Happens and How to Manage It
Last updated · 12 min read · By David Chen, MD, PhD
Retatrutide Fatigue: Why It Happens and How to Manage It
Last updated · 11 min read · By David Chen, MD, PhD
Retatrutide Injection Site Pain: Why It Happens and How to Reduce It
Last updated · 14 min read · By David Chen, MD, PhD
Buying Retatrutide Without Insurance: What It Actually Costs
Last updated · 10 min read · By David Chen, MD, PhD
Retatrutide vs Mounjaro & Zepbound: 24.2% vs 20.9% Weight Loss, Explained
Last updated · 16 min read · By David Chen, MD, PhD
Retatrutide vs Semaglutide: 24.2% vs 15% and What Actually Separates Them
Last updated · 9 min read · By David Chen, MD, PhD
Cagrilintide and CagriSema Explained: The Amylin Analog Behind the Next GLP-1 Combination
Last updated · 18 min read · By David Chen, MD, PhD
The Complete Retatrutide Guide: Mechanism, Trial Data, Dosing & Access (2026)
Last updated · 14 min read · By David Chen, MD, PhD
The Complete Semaglutide Guide: Mechanism, STEP Data, Dosing, and Safety
Last updated · 23 min read · By David Chen, MD, PhD
The Complete Tirzepatide Guide: Mechanism, SURMOUNT Data, Dosing, and Safety
Last updated · 21 min read · By David Chen, MD, PhD
GLP-1 Peptides for Weight Loss: The Complete Class Overview (Semaglutide to Retatrutide)
Last updated · 24 min read · By David Chen, MD, PhD
How Peptides Work: Receptor Mechanisms Explained
Last updated · 18 min read · By David Chen, MD, PhD
How Retatrutide Works: The Triple Agonist Mechanism (GLP-1 / GIP / Glucagon)
Last updated · 7 min read · By David Chen, MD, PhD
How to Buy Research Peptides Online Safely: A Vendor Vetting Guide (2026)
Last updated · 21 min read · By David Chen, MD, PhD
How to Get Retatrutide in the US: 2026 Access Guide
Last updated · 7 min read · By David Chen, MD, PhD
How to Get Semaglutide in the US: A 2026 Access Guide
Last updated · 17 min read · By David Chen, MD, PhD
How to Get Tirzepatide in the US: A 2026 Access Guide
Last updated · 12 min read · By David Chen, MD, PhD
How to Read a Peptide COA (Certificate of Analysis): A Field-by-Field Guide
Last updated · 20 min read · By David Chen, MD, PhD
How to Reconstitute Peptides with Bacteriostatic Water (Step by Step)
Last updated · 7 min read · By David Chen, MD, PhD
Is Retatrutide Safe? What the Trial Data Says About Risks, Cancer, and Myths
Last updated · 13 min read · By David Chen, MD, PhD
Lyophilized vs Reconstituted Peptides: The Powder-to-Solution Shift Explained
Last updated · 12 min read · By David Chen, MD, PhD
Oral vs Injectable Semaglutide: Rybelsus Tablets vs the Pen, 17.4% vs 14.9%
Last updated · 16 min read · By David Chen, MD, PhD
Peptide Dosing Units Explained: mg, mcg, IU & Reading an Insulin Syringe
Last updated · 13 min read · By David Chen, MD, PhD
Peptide Half-Life & Pharmacokinetics: Why Dosing Cadence Varies
Last updated · 17 min read · By David Chen, MD, PhD
Peptide Purity Testing Explained: HPLC, Mass Spec & What Purity % Means
Last updated · 19 min read · By David Chen, MD, PhD
Peptide Storage & Stability: Temperature, Shelf Life & Handling
Last updated · 15 min read · By David Chen, MD, PhD
Peptides to Stack With Retatrutide: BPC-157, GHK-Cu, MOTS-C & Tesamorelin
Last updated · 14 min read · By David Chen, MD, PhD
Retatrutide 3-Month Results: What ~10% at 12 Weeks Really Means (24.2% Comes Later)
Last updated · 14 min read · By David Chen, MD, PhD
Retatrutide Mistakes That Slow Your Results: 12 Common Errors
Last updated · 15 min read · By David Chen, MD, PhD
Retatrutide Dosing & Titration: How the Phase 2 Trial Escalated to 12 mg Weekly
Last updated · 13 min read · By David Chen, MD, PhD
Retatrutide Half-Life: How Long It Stays in Your System (~6 Days)
Last updated · 8 min read · By David Chen, MD, PhD
Retatrutide Nausea & GI Side Effects: Why They Happen, How Long They Last, and How Titration Manages Them
Last updated · 18 min read · By David Chen, MD, PhD
Retatrutide Not Working? Why Results Stall, and What the Trial Data Says to Do
Last updated · 17 min read · By David Chen, MD, PhD
Retatrutide Side Effects: What the Phase 2 Data Reported (and How They're Managed)
Last updated · 14 min read · By David Chen, MD, PhD
Retatrutide Stopped Working? What the Science Says About Plateaus
Last updated · 16 min read · By David Chen, MD, PhD
Retatrutide vs Ozempic & Wegovy: 24.2% vs ~15% Weight Loss, Explained
Last updated · 15 min read · By David Chen, MD, PhD
Retatrutide vs Semaglutide: 24% vs 15% Weight Loss Compared
Last updated · 7 min read · By David Chen, MD, PhD
Retatrutide vs Survodutide: Triple-Agonist vs Dual-Agonist Compared
Last updated · 16 min read · By David Chen, MD, PhD
Retatrutide vs Tirzepatide: 24.2% vs 20.9% Mean Weight Loss, and What Actually Separates Them
Last updated · 14 min read · By David Chen, MD, PhD
Retatrutide Week-by-Week Timeline: What to Expect Across the 48-Week Phase 2 Endpoint (24.2% Mean Loss)
Last updated · 15 min read · By David Chen, MD, PhD
Semaglutide Dosing and Titration: The 0.25 to 2.4 mg Schedule Explained
Last updated · 13 min read · By David Chen, MD, PhD
Semaglutide Side Effects: What the STEP Trials and Real-World Data Reported
Last updated · 20 min read · By David Chen, MD, PhD
Semaglutide vs Tirzepatide vs Retatrutide: 14.9% vs 20.9% vs 24.2%, and How to Choose
Last updated · 21 min read · By David Chen, MD, PhD
Semaglutide Week-by-Week Timeline: The STEP 1 Trajectory to 14.9% at 68 Weeks
Last updated · 19 min read · By David Chen, MD, PhD
Survodutide vs Retatrutide vs Mazdutide: The Next-Gen GLP-1 Pipeline Compared
Last updated · 20 min read · By David Chen, MD, PhD
Tirzepatide Dosing and Titration: The 2.5 to 15 mg Schedule Explained
Last updated · 14 min read · By David Chen, MD, PhD
Tirzepatide Dosing Units and Reconstitution: mg, Units, and the Math
Last updated · 14 min read · By David Chen, MD, PhD
Tirzepatide Side Effects: What the SURMOUNT and SURPASS Trials Reported
Last updated · 17 min read · By David Chen, MD, PhD
Tirzepatide vs Semaglutide: 20.9% vs 14.9% Weight Loss Compared
Last updated · 15 min read · By David Chen, MD, PhD
Tirzepatide Week-by-Week Timeline: What the Trial Data Suggests to Expect
Last updated · 16 min read · By David Chen, MD, PhD
What "Research Use Only" Actually Means for Peptides
Last updated · 16 min read · By David Chen, MD, PhD
What to Look for When Buying Retatrutide: Purity, Testing & COA Checklist
Last updated · 18 min read · By David Chen, MD, PhD
What to Look For When Buying Semaglutide: Purity, Testing, and COAs
Last updated · 22 min read · By David Chen, MD, PhD
What to Look For When Buying Tirzepatide: Purity, Testing, and COAs
Last updated · 19 min read · By David Chen, MD, PhD
How We Vet a New Peptide Manufacturer: Our COA & Testing Standard
Last updated · 7 min read · By David Chen, MD, PhD
Welcome to Our Blog
Last updated · 1 min read · By Daniel Hearty, Founder
Welcoming David Chen, MD, PhD
Last updated · 2 min read · By Daniel Hearty, Founder
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