Longevity is the category where the combinations multiply fastest. Fat loss has four or five pairings that everyone argues about. Anti-aging has a dozen, layered on top of each other, and the reason is straightforward: aging is not one process, so every mechanism anyone has studied becomes a candidate for the stack, and nothing ever gets subtracted.
This page covers the combinations that actually come up repeatedly, rather than every permutation that exists. Each entry explains 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.
One thing that makes this category different
Almost everything on this page is measured in outcomes nobody can observe on a useful timescale. A fat loss compound either moves a number in a few months or it does not. A longevity compound is being discussed for effects that, if they are real, would take decades to show up, which means the evidence is almost entirely cell studies, animal studies, and short human trials measuring markers rather than outcomes.
That is not a reason to dismiss the category. It is a reason to read the underlying research differently than you would for anything else on this site, and how to read research is worth having open alongside these pages. It is also why nothing on this page is framed as an effect. The gap between "this compound changes a measurable marker in cells" and "this compound extends anything" is the entire subject.
GHK-Cu with epithalon
This is the flagship pairing of the category and the one with the most substantive research behind either half.
GHK-Cu is a copper peptide with one of the largest in vitro evidence bases of anything discussed here, mostly in skin, collagen and wound research. Epithalon is a four amino acid peptide studied along a completely different line, in telomere and pineal research, largely out of a body of Russian work that is worth understanding the provenance of before weighing it.
The community pairs them because they are studied at different layers, one structural and visible, one cellular and not. We have a full write-up of this combination at GHK-Cu plus epithalon, including where the evidence actually sits for each, and epitalon versus GHK-Cu if you are deciding between them rather than running both. If epithalon is the half you are less sure about, pinealon versus epithalon covers the closest adjacent compound and what to expect from a first dose is the practical page.
SS-31 with urolithin A and MOTS-c
This one gets discussed as a sequence rather than a stack, which is a meaningful distinction and the reason it has its own page.
SS-31 is studied for its interaction with the inner mitochondrial membrane. MOTS-c is a peptide encoded in mitochondrial DNA rather than nuclear DNA, studied in metabolic signaling. Urolithin A is not a peptide at all, it is a compound produced when gut bacteria break down ellagitannins from foods like pomegranate, and it appears in this conversation because of mitochondrial recycling research.
The community discusses them in a specific order rather than all at once, on the reasoning that clearing damaged mitochondria and supporting the remaining ones are different jobs that may not belong in the same week. The sequencing guide covers that logic in full, and it is the better page if this is the group you came for. NAD+ frequently gets added to this cluster on similar reasoning, which is worth noting mostly because it is where the monthly cost of this category tends to double.
The growth hormone secretagogues
This group belongs on the page because it is genuinely common in longevity discussion, and it comes with a complication the other entries do not have.
Sermorelin, CJC-1295 and ipamorelin are discussed as combinations, most often CJC-1295 without DAC paired with ipamorelin, on the reasoning that one pushes the release signal and the other amplifies the pulse. That pairing has more discussion behind it than almost anything else in this category.
The complication is that unlike GHK-Cu or epithalon, several compounds in this group also exist as approved prescription medications. Sermorelin and tesamorelin have both been approved for specific clinical uses, which means the same molecule can reach you through two entirely different routes at prices that are not remotely comparable, under terms that are also not comparable. Read research grade versus approved before the per milligram gap starts to look like a straightforward saving, and growth hormone versus GH peptides for why this group is not a cheaper version of the thing people assume it substitutes for. If you are choosing between the specific combinations, CJC-1295 and ipamorelin versus sermorelin is the comparison.
What running a combination actually changes
- This category stacks upward and never downward. Longevity protocols accumulate compounds because every mechanism sounds additive and nothing ever gets removed. Four compounds is a common landing point and it is rarely a decision anyone made deliberately.
- The cost compounds faster than anywhere else on this site. Two per milligram prices in two vial sizes is already hard to estimate in your head. Four is a monthly figure people are routinely wrong about by a wide margin.
- You are verifying every vendor, not the best one. Each compound is another certificate of analysis to read. The weakest link sets the standard for the whole thing.
- You cannot tell what did what, and here you may never be able to. Attribution is hard in any stack. In a category where the claimed effects are not observable on a human timescale, starting several compounds together means there is no signal to attribute in the first place.
- Mixing in one syringe is a separate question. Combining peptides in one syringe covers what to think about before doing it for convenience.
Working out what a stack really costs
A combination only makes financial sense once every component is 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. In a four compound protocol those small differences stop being small.
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, finding quality sources covers what to look for in a vendor, 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 the anti-aging category tends to be marketed at women and researched around men, start with the for women guide and peptides and women's health. If the changes you are noticing are arriving alongside other changes, peptides for menopause and perimenopause is the more relevant page, and peptides for sleep covers the piece of this that people most often mistake for an aging problem.
The companion hubs to this one are the recovery and injury stacks and the fat loss and body composition stacks.