I make peptide videos. I’ve only ever taken one.

This is the written version of My Tirzepatide Story: Why It’s the Only Peptide I’ve Taken — watch it instead if you’d rather.

On this channel I normally take apart somebody else’s study or somebody else’s lab report, and I try to keep myself out of it. This one is different. I talk about peptides a lot, so I think you deserve to know where I actually stand, and what I’ve actually put into my own body, before you take anything I say about them.

So here it is. One peptide, ever: tirzepatide. And one that got as far as my cart.

The trend line I didn’t like

In August 2024 my wife Renata and I moved from Perth to New York for work. The hours went up, the stress went up, and so did the food — the bagels, the cheesecake, the pizza, everything you see on TV and don’t get in Australia. We wanted to try all of it.

The thing is, we live a pretty healthy life. We train six days a week, up at four and done before work, and we barely drink. The only thing that really moves for us is diet, and you can’t out-train a bad one.

My weight has always gone up and down. This time it was doing something new: every trough was higher than the last one, and every peak was higher too. As an engineer, that is one trend line you really don’t want to see on your own chart. I ended up at the heaviest I’ve ever been.

But the scale wasn’t what scared me. A routine set of blood tests was. My cholesterol came back really high, and at 42 that starts to creep into your head. I followed the doctor’s advice to the letter — train less, cut back some eggs, dairy and saturated fat — and tried more training and less. Nothing moved the cholesterol.

Why it felt like cheating

That’s when I started seriously thinking about tirzepatide, one of the newer weight-loss drugs built to copy hormones your gut already makes after you eat — the ones that tell your brain you’ve had enough.

And honestly, it felt like cheating. I’d never needed anything before, so why now? The way I squared it: taking it doesn’t change my training. I still work hard, and we already use things like protein and creatine to back that training up. This was another tool in the toolbox, and it was a medical decision driven by a blood result, not vanity on its own. It is not a magic injection.

Renata’s view is the balanced one: everything carries risks, and if you don’t have to take something, maybe don’t. She doesn’t have my cravings, so she doesn’t take it.

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The day the thought never came

The first day was a weekend. I was on the couch watching TV, which is normally when I’d be into the chips. A few hours later I realised the thought hadn’t even crossed my mind. You don’t take it and feel something. The cravings just don’t show up. Everything in my day used to circle around food, and suddenly it took a back seat.

Brand name, compounded, and what “regulated” actually means

It was prescribed by my doctor but not covered by my insurance. At the time, the brand-name version was costing me around $499 a month at the lowest dose. A compounded version — tirzepatide with some vitamin B12 and glycine mixed in — was $199 a month. Less than half.

A compounding pharmacy makes up a medicine for an individual patient from a prescription, rather than it coming out of a drug company’s factory. In my head it was a back-alley lab waiting to rip me off, so I did the research. I went through a telehealth service: a shop front on a website, a doctor behind it who writes the prescription, and a compounding pharmacy that actually makes it.

The shop front isn’t who makes it. So my due diligence went on the pharmacy underneath, not the website.

I’d always told myself compounding was heavily regulated. For this video I went back and checked the rules properly, and that turned out to be too generous. As of October 2026, in the US, compounded drugs aren’t FDA-approved and the FDA doesn’t check them before they’re sold. The pharmacies are overseen mainly by state pharmacy boards, and there’s no independent check that what’s in the vial is what’s on the label. And the B12 in mine doesn’t make it a different, better or more legal drug — the FDA has said a GLP-1 with B12 added can still be essentially a copy of the approved one.

It’s still a lot more than the gray market, but it’s less protection than I thought I had. If it ever starts worrying me, I’ll get it tested myself.

Going slow, and where it got me

I started lower than even the usual starter dose and stepped up slowly over a couple of months. At my highest I only ever got to around half to two-thirds of what’s considered the minimum effective dose, and for me that was enough. Without a doctor keeping an eye on things, guessing your way through a dose is how people end up with side effects they didn’t see coming.

My side effects were mild: nausea when I started or stepped up, filling up very quickly, and it settled in two or three days. And one I didn’t know about: I used to wake up during the night with cravings, and on it I slept straight through.

I went from 195 pounds to a low of about 160, and I sit around 163 to 164 now. My strength held, pull-ups got easier, and the number that actually mattered came back right: at my follow-up tests, my cholesterol and the other markers I was worried about were back in the healthy range.

It wasn’t a straight line. In March 2026 I stopped for a month while we visited family in Perth, and after a couple of weeks the hunger and the weight started coming back. I started again in May. What it taught me is that you don’t just take it, lose the weight and stay there. The leaner I get, the harder my body fights to put it back. If you want the mechanism behind that, why the weight comes back when you come off these drugs is the companion piece.

The cart, and the four questions

That’s exactly when the other peptides started looking tempting. I looked at BPC-157 and TB-500, CJC-1295 and ipamorelin, and the ones that tempted me most, MOTS-c and SS-31. None of them could come from a doctor and a pharmacy for someone like me. The gray market was the only route, with everything that comes with it: being ripped off, not getting what’s on the label, endotoxin, or a product that simply isn’t sterile.

I spent months picking holes in certificates. One company’s was genuinely good. I got as far as the checkout — and something there made me look at the company itself. Once I dug in, it didn’t stack up at all. I’ll leave the detail for the video. The lesson was simple: the certificate nearly passed, the company failed, so a good certificate on its own isn’t enough.

So if a guy at the gym asked me about BPC-157, he’d need four answers first:

• Do you actually need it? Don’t take something unless you truly need to.
• Is the company legitimate? Run every check you need until you’re satisfied it’s real.
• Does the certificate check out? Does it answer every question it needs to, so you know the product you get is the product you bought?
• What does the research actually show? Animals or humans, how it was given, what was seen, and whether any dose-finding has been done in people at all.

Then, and only then, weigh the risk against the reward. And if you’ve done all that, prioritise the legal route and work with a doctor. Retatrutide is the obvious temptation here: in its own bigger trial the top dose lost about a quarter of body weight against about a fifth for tirzepatide’s top dose in a different trial, with different people, and the head-to-head hasn’t reported. As of October 2026 it isn’t approved anywhere. I wouldn’t risk the gray market for that gap when I can get tirzepatide properly. There’s more on that in the retatrutide piece.

The bottom line

I’ve only taken one peptide because it’s the only one where the first two questions came back yes: I actually needed it, and I could check who was making it. Every other one failed at least one of those two, and the closest call failed on the company, not the certificate.

I’m at the weight I want now, so I’m tapering off slowly, weighing myself every day, logging every session, with blood tests to follow. That’s my plan for my own numbers, not a method for anyone else.

That’s why this channel exists. I’m not for peptides or against them. I’ve taken one, and I can see why you’d want to. I just want you to have the information to make your own call, because you’ve only got the one body.

Had a certificate sent to you? I read them — peptidecorner.net/coa-read

Sources

1. FDA, Compounding and the FDA: Questions and Answers — compounded drugs are not FDA-approved, and state boards of pharmacy have primary day-to-day oversight of most compounding pharmacies — https://www.fda.gov/drugs/human-drug-compounding/compounding-and-fda-questions-and-answers
2. FDA, clarification of policies for compounders as national GLP-1 supply begins to stabilize — a compounded product with an added ingredient such as vitamin B12 can still be essentially a copy of the approved drug — https://www.fda.gov/drugs/drug-alerts-and-statements/fda-clarifies-policies-compounders-national-glp-1-supply-begins-stabilize
3. FDA, concerns with unapproved GLP-1 drugs used for weight loss — https://www.fda.gov/drugs/drug-alerts-and-statements/fdas-concerns-unapproved-glp-1-drugs-used-weight-loss
4. Jastreboff et al., New England Journal of Medicine 2022, SURMOUNT-1 — tirzepatide in adults with obesity and no diabetes, 72 weeks: about a fifth of body weight lost in the top-dose arm — https://pubmed.ncbi.nlm.nih.gov/35658024/
5. Jastreboff et al., New England Journal of Medicine 2026, TRIUMPH-1 — retatrutide in adults with obesity and no diabetes, 80 weeks: about a quarter of body weight lost in the top-dose arm — https://pubmed.ncbi.nlm.nih.gov/42814954/
6. ClinicalTrials.gov NCT06662383, TRIUMPH-5 — the head-to-head trial of retatrutide against tirzepatide, which has not reported — https://clinicaltrials.gov/study/NCT06662383

Educational and research purposes only — not medical advice. Peptide Corner does not recommend any vendor, source, or dose. Keep safe, keep skeptical.