I recently had a client react to tesamorelin. They'd been on tesamorelin for a few weeks. Small dose, titrated up slowly, five days on and two off. Then one night the injection site got itchy and hard. Not the usual sting. It stayed raised and inflamed for a couple of days and they ended up taking a Benadryl. Here's what made it easy to pin down: that shot was the only thing they'd done that evening. Everything else in the stack had gone in that morning. The timing isolated it cleanly. Had they taken it all together, I'd have been guessing. So we stopped. That's the part I want to underline, because the instinct is to push through, or drop the dose and keep going. Once the immune system is on alert, giving it more of the same class right away just teaches it to reject the next one too. You have to let things quiet down first. Then the good news. Reacting to one GH analog doesn't mean you're done with the category. This client had done beautifully on Sermorelin. The clinical data isn't clear as to why some people are sensitive to a certain peptide and others aren't. But I feel that's the beauty of this evolving field, and I hope we are able to discover more about what causes some of these bio-individualities. I'm curious, has anyone from the community experienced this type of a sensitivity or reaction, or heard of something similar happening? Would love some thoughts

Let's get right into it: How much of the weight people are losing on GLPs is coming from muscle and not fat? Some of the research and clinical data is staggering. In the landmark trials: - Semaglutide (STEP-1): ~15% body-weight loss over 68 weeks, with roughly 40% of that loss coming from lean mass. - Tirzepatide (SURMOUNT-1): ~21% body-weight loss, with about 25% from lean mass — a more favorable ratio. Because tirzepatide drives larger total loss, the absolute pounds of muscle at risk can be similar or higher, and newer real-world (routine-care) data in 2026 actually found greater relative lean-mass loss on tirzepatide than semaglutide over 12 months. Translation: don't assume the "better" drug protects your muscle for you. Neither does. You do. On the positive though: in studies where people paired their GLP-1 with enough protein and resistance training, lean-mass loss dropped to nearly nothing, on the order of 1–2 lbs total.. Why it happens (the mechanism, briefly) GLP-1 medications are appetite silencers. They mimic your gut's own glucagon-like peptide-1, slow gastric emptying, and blunt ghrelin, the "I'm hungry" hormone. You simply eat less, often dramatically less. The 3-part muscle-preservation playbook: 1. Hit a real protein floor every single day. The evidence target for preserving lean mass during weight loss is at least ~1.6 g of protein per kg of body weight per day. On a GLP-1, where appetite is suppressed, the practical rule is simpler: never drop below ~100 g of protein a day, and aim higher. For most people that looks like 2 protein-anchored meals of ~40–50 g each, topped up with a whey or essential-amino-acid (EAA) shake. Protein is also the most satiating macro, so this is the easiest one to defend even on a tiny appetite. 2. Front-load leucine (whey + EAAs are your friends). It's not just total protein — it's getting enough leucine per meal to actually trigger muscle-protein synthesis. Whey protein and EAA supplements are the most reliable, muscle-preserving way to do this when whole-food appetite is low. One or two servings a day covers most people who are struggling to eat.

First things first, an apology. It's been quiet in here for a while, and that one's on me. I haven't disappeared, I've just been heads down building a whole clinical training apparatus: live webinars, discussion sessions in between, teaching materials, and protocol breakdowns, all built around what practitioners actually need. The first session kicks off this week, and this is a special invite for this community. It'll be a deep dive into GLP metabolic chemistry: blood sugar regulation, AMPK, GLUT-4, leptin resistance, mTOR signaling, and why optimizing cellular metabolism matters more than just shifting macronutrients. https://zoom.us/webinar/register/WN_xYBVQ7z5TtijeCUklLgMhA#/registration This webinar will be this Thursday, July 30th at 3 p.m. PST. If you register, you'll receive the recording as well. Looking forward to a great discussion!

Kept in the fridge, but a few doses taken - Tirzep - if it makes a difference.

Hi PPA Gang, I just got back from an amazing weekend facilitating peptide events in SF and LA. A very common question and discussion point was regarding GLP-1s and the media hype around them affecting people's ability to fall in love. Most people felt that this was hype and not true at all. however, I met some people that were taking a high of Reta that felt like this could be the case of them. But that they actually didn't mind this. Based on the literature, i felt that this was more nocebo-induced rather than a real physiological process. But I'm curious if anyone has any thoughts or experience?