The Tesamorelin Masterclass | Complete Researcher’s Guide (2026)

Tesamorelin is one of the few peptides I've seen actually move the needle on body composition. So I made a full masterclass on it. This is the user's guide as it stands in 2026. I cover what tesamorelin is, how it works, and the best practices I'd recommend for using it. We get into the growth hormone axis and why a GHRH is different from a GHRP. I break down the clinical data, the 15% visceral fat reduction, the liver fat numbers, and the cognition research almost nobody talks about. Then we get practical. Dosing, timing, fasted injections, and the cycling patterns I actually use. I share why I stay at one milligram instead of two and what the water retention tradeoff looks like at higher doses. I also cover stacking with testosterone and GLP-1s, reconstitution, injection technique, side effects, and the people who should skip this one entirely. I'm honest about the limits too. Some of this evidence is strong and some of it isn't. I tell you which is which. If you're thinking about tesamorelin or already using it, this is everything I'd want you to know. ⚠️ For research and entertainment purposes only. ⚠️ Links, cheatsheet, private group and more: https://hunterwilliamshealth.com/links 00:00:00 Intro and why I love this peptide 00:01:22 What we're covering today 00:01:48 Tesamorelin vs growth hormone (GHRH vs GHRP) 00:03:00 The clinical headline numbers 00:03:32 Molecular structure, half-life, and brand names 00:04:46 The growth hormone axis (the thermostat) 00:05:40 Clinical effects: fat, liver, IGF-1, lipids, cognition 00:06:38 Tesamorelin vs sermorelin, CJC, ipamorelin, MK677 00:07:52 Who this peptide is for 00:11:08 Who should skip it 00:11:38 My partial empty sella and head trauma 00:13:26 Dosing: the three-tier ladder 00:17:56 Timing: bedtime dosing 00:18:22 Fasted injections and why they matter 00:20:08 Morning dosing 00:20:42 The five days on, two days off schedule 00:21:44 What to expect and the timeline 00:23:20 How to know it's working 00:24:48 Cycling and antibody formation 00:26:18 Standard cycling patterns 00:28:04 Stacking with other peptides 00:32:20 Reconstitution made simple 00:33:00 Injection technique 00:35:04 Stacking with testosterone 00:37:00 Troubleshooting: "I don't feel anything" 00:37:56 Side effect management 00:39:40 When to discontinue 00:40:20 FAQs: oral use, cost, and more 00:41:28 The cancer question 00:41:52 Future outlook and active trials 00:43:38 The bottom line