CommunityStacking & Switching

GLP Stacking + or -

44 replies17 peopleAug 13, 2026☆ Follow
Summary

Is stacking multiple GLP agonists beneficial or risky compared to using one or adding amylin agonists?

Users share experiences and opinions on combining GLP drugs like sema, tirz and reta versus single agents or amylin additions. Some report success adding low-dose sema to reta for food noise control with manageable sides, while others prefer keeping things simple with one drug or maxing a single dose first. Ongoing trials on combos are noted, along with informal accounts of stacking being common. Concerns center on side effects, potential tolerance, and long-term maintenance after reaching goals.

What this discussion establishesWhere people disagree

Whether stacking multiple GLPs is a sensible approach or better avoided in favor of single-drug max doses or amylin additions

Still open

Long-term effects on receptor sensitivity, insulin resistance and maintenance after goal weight is reached

Nothing here is advice.

44 replies · 17 people
SlowHarbour20archiveopening postAug 13

As the title asks, is stacking positive or negative? People do it, but what are the possible downsides? It's usually tried when one GLP isn't curbing appetite or sustaining weight loss, so another gets added, and I've seen this across the GLPs. I asked someone on another platform why they added a second GLP instead of trying cagrilintide first and got no clear reason. I haven't found studies on multi-GLP use, only single GLP. In my view it might help short term if sides stay tolerable, but those sides could persist or worsen. Longer term it might hurt more once the goal is met and maintenance begins, especially for insulin resistance and metabolic function. I don't know anyone who's done it and haven't tried it myself, just thoughts. Any feedback or experiences welcome.

PatientPebble79archiveAug 13
↳ replying to @SlowHarbour20 (opening post)

Clinical trials are looking at combinations now. Tirz plus elora seems especially promising while sema plus cag looks weaker. If the downsides outweighed the upsides the studies would probably stop. Any drug has possible drawbacks. Skipping cagri is fairly common because its reputation has faded some. This site has lots of personal stories about stacking GLPs, cagri and the like. Whether it's good or bad is like asking if Gala apples are good, people just have their own preferences.

LevelThistle44archiveAug 13
↳ replying to @SlowHarbour20 (opening post)

Not sure if you're asking about GLP with another GLP or stacking in general. Good to see a new person start a thread with some substance. My basic idea is less is more if it works. Adding more peptides hopefully doesn't cost much. I added sema to my 18 mg weekly reta to cut food noise and break a creatine-related weight stall. I have plenty of options but chose sema because it's common and I hadn't used it before, though I had taken tirz and reta. I just wanted food noise reduction that a GLP1 should give. I have cagri and elora but figured a bit of sema might handle it and save the amylin for later if needed. Sema worked. Sides were mild overall but more noticeable next to 5 mg tirz or up to 20 mg reta. My tolerance at that reta level turned out to be about 0.125 mg twice a week. Went from 223 lb on 6/11 to 200 lb on 8/5. Part of that is water coming off.

AmberCinder18archiveAug 13

I read everything about GLPs but I'm still hesitant to add another to my current tirz. I've lost 50 pounds and have more to go, so it's tempting, but tirz has been great with zero sides so I want to stay on it long term. I do keep reta in the freezer as a backup. Tried adding cagri once and found I'm mildly allergic. Watching elora and maz but sticking with tirz for now. I don't want multiple injections and like keeping it simple. Also not convinced by the receptor burnout idea since there's no science behind it yet. Does stacking GLPs raise the chance of that? Still unanswered.

GreyAlder81archiveAug 13
↳ replying to @LevelThistle44

Your signature really came through for me. It covered everything I needed to know right before I could even wonder about it.

SlowHarbour20archiveAug 13
↳ replying to @PatientPebble79

I wasn't referring to amylins in that comment. My point was about the GLP variants instead. It looks like I skipped mentioning this part when I shared my notes on the site. That line of thinking holds up well. You touched on receptor burnout near the close. I suspect it's accurate, though the process doesn't match what happens with Mu or GABA receptors if you mess with those ones badly. On how these work, the first lines up with Q, the next with RS, and the last with TUV, and more test versions are already in development. The whole setup seems remarkable to me, and I haven't come across anything similar in other medicines. Firms have put out their own takes without finishing the refinements, yet folks are still seeing gains like preserved lives along with reduced risks. Wild.

SlowHarbour20archiveAug 13
↳ replying to @LevelThistle44

That's great! I was specifically asking about taking two GLPs together instead of trying an amylin as you mentioned. Plenty of people do amylin plus GLP and that's been studied, but I was more worried about GLP plus GLP. Good work again.

NorthFenwick56archiveAug 13
↳ replying to @LevelThistle44

Interesting, thanks for the post, very informative, and congrats on the big weight loss. I'm stalled on reta and fighting food noise and cravings. Was thinking of adding tirz. I'm on a low dose of reta, 2 mg twice a week for 4 mg total weekly. From your graph it looks like you split doses twice a week too? And you found that a very small amount, 0.125 mg of sema twice a week, killed the cravings?

NorthBramble68archiveAug 13

It's madness. Some here have high risk tolerance and like to experiment. I find it odd and possibly harmful to stack two GLP1 RAs like sema plus reta or tirz plus reta. More logical to first reach the max tested or tolerated dose, then if needed add something with a different mechanism like cagri or elora. When is more needed? What's the best weight loss rate? Hard to say without medical supervision.

LevelThistle44archiveAug 13
↳ replying to @NorthFenwick56

I split almost everything. 0.25 mg of sema hit hard, you can see the delayed reta dose in the chart. I thought about 0.25 mg twice weekly but that would have been rough. The simple answer for you is to take more reta.

LevelThistle44archiveAug 13
↳ replying to @NorthBramble68

You don't fit in with folks around here anyway so go ahead and savor that overly cautious doctor monitoring when using peptides from unofficial sources.

NorthFenwick56archiveAug 13
↳ replying to @LevelThistle44

You chose sema because you'd never had any tolerance to it, right? So it would hit harder than tirz which you'd used before and probably had some tolerance to, correct? You mentioned considering 5 mg of tirz.

LevelThistle44archiveAug 13
↳ replying to @NorthFenwick56

Nope and nope. I don't have tolerance concerns with anything. I'd never taken sema, wanted to try it, so I did. It worked fine. Stacking tirz would have been fine too and probably with fewer sides. I was taking 5 mg of tirz when I switched to reta.

NorthWillow72archiveAug 13
↳ replying to @LevelThistle44

With so many of these threads you hear the same arguments that don't make much sense to me. If you're on reta and raise the dose you're increasing all three: GLP1, GIP and glucagon. If you don't raise it and just add sema you're boosting only the GLP1 part without adding the other two. Basically one receptor difference from just taking more reta, affecting only one active component. Lets you get the GLP1 benefits shown in the diagram below. It makes sense that you could mix and match with reta without introducing any new active ingredients.

BrightSparrow36archiveAug 13
↳ replying to @NorthWillow72

I think many who give negative opinions about stacking GLPs without having tried it themselves haven't researched the actions and relative strengths of the different agonists much.

NorthWillow72archiveAug 13
↳ replying to @BrightSparrow36

I don't mean to sound like I know for sure, it's just a theory or hypothesis. If you increase your dose aren't you basically doing the same as stacking, just with different strengths? More reta is simply more of all three, obviously in different amounts. My only question is whether there's even a reason to. I'm lucky I responded well. We're learning more about how these peptides act differently in different people. I was ready to stack if needed but wanted to wait until it was my only option due to a stall. Just my opinion based on what looks like simple math. Would like to hear other views on this theory.

SlowFenwick25archiveAug 14

I'm thinking about stacking reta with my tirz specifically to get more fat reduction in the liver. Yet an active trial is looking at how tirz affects liver fat which could mean any added effect ends up small. Research on these keeps expanding and I expect it will cover combinations at some point. Right now my reta supplies stay in the freezer since tirz is performing well for me I'm close to my target and I've seen accounts of others who switched only to discover the earlier one lost some effectiveness later on.

RustBramble70archiveAug 14
↳ replying to @LevelThistle44

The visuals really weave an engaging narrative. Nice going.

BrightSignal52archiveAug 14
↳ replying to @LevelThistle44

Nice charts. I have handwritten notes in a lab book and calendar. I have apps but can't keep up with them as well as the lab book.

RustBramble70archiveAug 14

I've been on reta since late March, settled at 2.25 mg Monday and Thursday mornings fasted except for milk in coffee. I responded better than some since that dose has really cut food noise and I lost about 40 lb in 4 months. Lately food noise is returning though it's not pushing me toward junk food. Protein helps the cravings but my daily calorie deficit has shrunk. Since I've read tirz is better for food noise I'm thinking of replacing one of the two weekly reta pins with tirz, starting at 1 mg and going up to 2.5 over a few weeks. Not sure if that's a good plan but I'll try it. Comments welcome.

NorthWillow72archiveAug 14
↳ replying to @RustBramble70

My only feedback: is it time to stack? Is the reta still working? If you're still losing even with some food noise why change? I'd save the stack for when a stall hits. 40 lb in 4 months is great, many would be happy with that. If you're still at 1-2 lb per week I'd stay the course.

LevelThistle44archiveAug 14
↳ replying to @BrightSignal52

I hate handwriting so electronic options work better for me. I have friends who prefer handwriting and dislike electronic notes.

BrightSignal52archiveAug 14
↳ replying to @LevelThistle44

I use electronic notes for AI medical advice but still prefer my lab book like back in my chemistry degree days in the 80s when computers were mainframes and laptops were new, heavy and expensive.

RustBramble70archiveAug 14
↳ replying to @NorthWillow72

Thanks, that's probably wise advice and thanks for the encouragement. Going back to my original idea about adding tirz, I was also thinking the cheaper tirz would stretch my current reta supply and save some money. Not a big issue though.

RustBramble70archiveAug 14
↳ replying to @BrightSignal52

Me too maybe. I use a couple online sites for tracking protocols and inventory but still think I'd prefer a dedicated notebook. Maybe it's the tactile feel, like why some people can't switch to e-readers and prefer a real paperback.

NorthWillow72archiveAug 14
↳ replying to @RustBramble70

I'm really into using spreadsheets for organizing stuff. Each one can have multiple sections set aside for various purposes. At this point mine contains eighteen of those sections. A few monitor what I buy, others handle how much I consume along with math stuff. There's one section holding web addresses plus explanations, another focused on eating habits, yet another for tasks I need to complete, plus more like that.

PatientBeacon15archiveAug 14
↳ replying to @NorthWillow72

It's unsettling how the sections in your document line up so closely with mine. I have no reason to think my parent ever put any brothers or sisters up for adoption, though...

RustBramble70archiveAug 14
↳ replying to @PatientBeacon15

Ha, that's great. Even though I already keep track of my blood pressure in a notebook I made myself from paper, and mark down daily or weekly pin details on a calendar hanging on the wall, plus check peptide protocol websites for logging that kind of thing, this has got me thinking about putting together some excel files instead. Mind telling me the labels for your columns and rows?

PatientPebble79archiveAug 14
↳ replying to @NorthBramble68

I'm curious why you think stacking GLP1s is risky when those combos are already in human trials. The makers don't seem worried about going that route, so I'm wondering where your confidence in amylin-GLP comes from while GLP-GLP is called madness. What are you reading that I'm not?

CopperHarbour29archiveAug 14
↳ replying to @NorthBramble68

People are taking 4 mg of reta and deciding to stack other GLPs before even reaching half the max dose. The idea of a max dose seems to scare some who don't fully understand how it works.

PatientPebble79archiveAug 14
↳ replying to @CopperHarbour29

I failed reta at 4 mg. What works for me is 2.5 mg reta plus 2 mg tirz. I don't see why pushing to the highest dose on one GLP would be better than stacking two at tolerated doses. Trying to understand the alarm around that. It sounds like there's some universal rule that maxing one GLP is the only right way and that's new to me. Maybe I'm the one who doesn't understand how it works. Can you explain?

SteadySparrow75archiveAug 15

Right? Imagine finding out there are rules we're supposed to follow with grey market GLPs. I'm comfortable mixing things up. Research is wild that way.

PatientBeacon15archiveAug 15
↳ replying to @RustBramble70

Been away for a couple days so it will take until next week before I can reach you privately.

CopperSignal27archiveAug 15
↳ replying to @SlowHarbour20 (opening post)

The reality is there's zero science on stacking multiple GLPs. All we have so far are the high dose sema studies at 7.2 and 16 mg which showed no new unexpected adverse effects, not much extra weight loss, and more GI sides and skin sensitivity, and they approved 7.2 mg sema. For stacking GLPs with amylin agonists there's the cagrisema studies that were generally disappointing, less effective than tirz alone with more sides, and very early tirz and elora results that sound promising. The only advantage of stacking GLP drugs like reta, tirz or sema is to adjust the relative balance of effects on the different receptors to get slightly different outcomes than the drug alone. You might tolerate a slightly higher total GLP dose by adding some tirz to 12 mg reta rather than going above 12 mg reta, since reta has somewhat worse GI sides and more skin sensitivity while tirz has stronger GIP agonism that might reduce those GI effects. A lot of people just do

SlowHarbour20archiveAug 18

I don't know how long you've been on GLPs. But how will you ever measure the effectiveness of each? Especially when you're adding them at what seems a fairly rapid rate, possibly adding another GLP within 2-4 months and also adding amylins which of course you know what they do. How are you measuring success of which combo is working?

SlowHarbour20archiveAug 18
↳ replying to @CopperSignal27

That analysis offered some really useful thoughts on the topic. Looking back at how the treatments progressed from the earliest GLP types onward to later options, each step brought better results in shedding pounds and reducing fat deposits including around the organs, along with reduced unwanted reactions. There are additional ones coming soon too. This comes close to creating an ideal medication, something that hardly ever happens. I wondered about it not just from interest but because in my view, unless someone spends the effort and has the resources to collect information and monitor their own numbers when mixing these substances by introducing them one after another over time, it's hard to know exactly which parts are effective or not, and it might lead to tolerance issues down the line. Appreciate the response once more.

RustQuill56archiveAug 18
↳ replying to @LevelThistle44

Are you really doing 18 mg of reta? Why'd you choose to go up that high?

RustQuill56archiveAug 18

My mother used this prescription for three and a half years now. She chose the branded version after dealing with out of control blood sugar issues spanning two decades before trying a fresh approach. Her levels dropped sharply from very high to normal range inside about nine months. Currently she's at the highest allowed amount and has begun putting on pounds gradually during the past half year. The reduction in her size happened gradually across those three years unlike what happened with me. Since her glucose readings are rising again she's thinking about trying a bit of something else alongside it. Everything is still pretty recent so limited research exists on bigger amounts. Perhaps someday folks could get even larger quantities but this has transformed things though if the effects fade after three years it doesn't look promising for ongoing use among those with the condition.

SlowHarbour20archiveAug 18
↳ replying to @RustQuill56

The frightening aspect comes in when considering people without that condition too if certain conditions aren't met exactly. Resistance to insulin plays a major role here. I expect upcoming medications will address this issue. Non-affected individuals might use it just temporarily until no longer required while those with the illness ought to reach a point where a full recovery is possible given current medical advances. Yet clearly that won't happen in either case since the medication works wonders universally and eliminating the desire or requirement would lead to reduced funding and studies which makes sense financially. What a shame. Wishing the best for her situation. Such an awful illness.

CopperSignal27archiveAug 18
↳ replying to @RustQuill56

I wonder whether this version of the medication actually comes through a legitimate prescription for someone dealing with diabetes. It seems unfortunate that nothing yet exists which physicians view as acceptably reliable for addressing the underlying issue. The sole compound backed by completed studies and formal approval remains the elevated semaglutide regimen, yet the stronger tirzepatide amount outperforms even that moderate semaglutide level, rendering the latter option fairly pointless here. Research into larger tirzepatide quantities continues, though those particular amounts remain inaccessible for now. Inhibitors of a certain kidney transporter produce only a modest reduction by eliminating roughly two hundred calories worth of glucose daily through urine, so they might help with glucose control or organ protection if not already in use, but they contribute little toward shedding pounds. People managing diabetes typically shed fewer pounds from these gut hormone agents compared with those who do not have the condition. The sole approaches I have encountered for boosting results involve obtaining higher tirzepatide amounts through unofficial channels or layering on another agent instead. Testing elevated amounts or combinations carries greater hazards when the individual is older, already managing diabetes, or otherwise not in robust health, since complications tend to arise more readily and with potentially graver outcomes. Proceeding without proper clinical oversight, ongoing lab work, and regular evaluations heightens those dangers considerably. In cases of extreme excess weight the downsides of such approaches appear smaller than those posed by the weight itself, yet the calculation shifts and becomes far more uncertain once age, diabetes, or other health factors enter the picture.

LevelThistle44archiveAug 18
↳ replying to @RustQuill56

I raised the amount to twenty milligrams each week and might lower it again later. The reason for going higher was to shed pounds since negative effects didn't hold me back. Over thirty-four weeks I lost twenty-nine percent, right on pace with my goal of one percent every seven days.

CopperSignal27archiveAug 18
↳ replying to @LevelThistle44

I came across research that used math to predict how much weight people lose on these GLP medications. It pointed to one of them having the greatest room to go up on the amount taken, meaning possibly bigger results from larger amounts until the benefits level off. That is, if the unwanted effects stay manageable. Not many seem to be using big amounts of this particular one, while bigger amounts of another seem to be used more often. The projections showed it could mean around forty percent average reduction at amounts between twenty and thirty milligrams.

LevelThistle44archiveAug 18
↳ replying to @CopperSignal27

Thinking about that particular report, it appeared prior to the Phase 3 information on Reta becoming available, yet I looked it over while increasing my amounts. It should be curious to observe whether those forecasts hold steady going forward. Once I reached my initial target of 200 pounds, I maintained my amounts steady so that the built-up concentrations could decrease substantially, allowing my body some rest. The idea was to miss one or two injections, watch hunger and cravings return strongly, then begin again at a suitable amount based on the observed response. To my surprise, the strong return never occurred. I resumed once the concentration dropped to the low point around 8mg per week, which meant spacing Reta every 11 days and Sema every 13. Notably, I hit a fresh low at 199 pounds and have kept the target weight stable. I'll extend the interval further, and if no additional drops occur, I'll modify the schedule accordingly.

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