Fat loss is where the peptide conversation gets loudest and least careful. The compounds involved are the ones most people have actually heard of, the prices swing more than anywhere else in this market, and the combinations get talked about as though the pairing itself were the point rather than a decision with a cost attached.
This page sorts through the combinations that come up most often. Each entry covers what the individual compounds are, why the research community discusses running them together at a mechanism level, and where to find the current per milligram price for each one so the real monthly number is in front of you before anything else is.
One thing to settle before the combinations
Several compounds on this page exist in two completely different worlds. Semaglutide and tirzepatide are approved prescription medications with brand names you already know. The same molecules are also sold as research compounds, at a fraction of the price, under terms that are not the same thing at all. Those two routes differ in oversight, in labeling, in who is accountable when something is wrong, and in what you are actually buying.
That distinction shapes every price on this page, so it is worth reading research grade versus approved and the telehealth to research grade comparison before the arithmetic starts to look persuasive. Cheaper per milligram is a real difference, and it is not the only difference.
Cagrilintide with semaglutide, often called CagriSema
This is the most discussed fat loss pairing in the market right now, and unlike most combinations on this site it is not something the community assembled. It is a named combination that has gone through formal clinical development, which is unusual here and worth weighing.
Semaglutide is a GLP-1 receptor agonist. Cagrilintide is an amylin analog, a different signaling pathway entirely. The reasoning behind pairing them is that they act through separate mechanisms rather than pushing harder on the same one, which is the same logic that shows up behind most of the pairings on this site.
We have a full guide on this one at cagrilintide plus semaglutide, including where the trial evidence sits and what the two components cost separately. Start there rather than here if this is the combination you came for.
Cagrilintide with tirzepatide, and with retatrutide
The same amylin plus incretin logic gets applied to the newer compounds, and both variations have enough discussion behind them to have earned their own pages.
Tirzepatide acts on two receptors rather than one, and retatrutide is the triple agonist still working through clinical trials. Pairing either with cagrilintide is a further step in the same direction, and each step adds cost, adds a second vendor to verify, and adds distance from anything that has been studied as a combination in humans. The details are in cagrilintide plus tirzepatide and cagrilintide plus retatrutide.
If you are still deciding between the single compounds before any pairing enters the picture, semaglutide versus tirzepatide is the more useful page, and the terminology in all of this is worth having straight first. The GLP-1 explainer and GLP terminology explained cover that.
5-Amino-1MQ with AOD-9604
This is the pairing that comes up among people specifically avoiding the GLP-1 category, and the honest summary is that it sits on a much smaller body of research than anything above.
5-Amino-1MQ is a small molecule studied for its effect on an enzyme involved in fat cell metabolism, and it is notable in this market for being orally available rather than injected. AOD-9604 is a fragment of human growth hormone, developed specifically to separate the fat metabolism research from growth hormone's other effects.
The community discusses them together because they are studied along unrelated metabolic lines. What you should know going in is that the preclinical work behind both is thinner than the GLP-1 literature by a wide margin, and AOD-9604 in particular has human trial results that were considerably less impressive than the early animal work suggested. AOD-9604 versus semaglutide puts that gap in plain terms, and it is a useful corrective if this pairing is being presented to you as an equivalent option at a lower price.
What running a combination actually changes
- The cost is not additive in the way you expect. Two compounds at two per milligram prices, in two vial sizes, running across the same weeks, produce a monthly figure that is rarely what people estimate in their heads. Work it out on paper before you commit to it.
- You are verifying two vendors, not one. Every compound you add is another certificate of analysis to read and another vendor whose testing you are trusting. The weakest link sets the standard for the whole thing.
- You lose the ability to tell what did what. Starting two compounds in the same week means you cannot attribute anything you notice to either one, including anything you would want to stop.
- Mixing in one syringe is a separate question. People do it for convenience and it is not always sensible. Combining peptides in one syringe covers what to think about first.
- Body composition is not the same as scale weight. This whole category gets discussed in pounds, which is the least informative number available. Muscle is easier to lose than most of this conversation admits, particularly for women over forty.
Working out what a stack really costs
A combination only makes financial sense once both components are in the same units, and vendors will not do that for you. Vial sizes differ, shipping differs, and the headline price on a product page is almost never the number worth comparing. The GLP-1 category makes this worse than most, because the same compound can differ several fold in price depending on the route it came through.
Pull the current per milligram figures on the live price comparison, and check each vendor in the vendor directory for published testing and transparency before price enters the decision at all. If the arithmetic is the unfamiliar part, how to calculate price per milligram walks through it, and the bacteriostatic water math covers the step after the package arrives.
Where to go from here
If you are earlier in this than the stacking question suggests, before you buy your first peptide is the better starting point and it will save you money.
For the version written with women specifically in mind, including how this category tends to be researched and marketed around men's bodies by default, start with the for women guide and peptides and women's health. If body composition changes are showing up alongside other changes, peptides for menopause and perimenopause is the more relevant page.
The companion hub to this one is the recovery and injury stacks.