A "stack" is just two or more peptides used together toward one goal. Here's how the common pairings are talked about, the logic behind each, and a link to every profile so you can read the real evidence yourself.
Education only — not medical advice. These are descriptions of how combinations are discussed, not recommendations, protocols, or dosing instructions.
Combining compounds can multiply unknowns and risks. Any dosing should be set with a qualified clinician, not a web page.
The most-talked-about soft-tissue repair pair. The idea is to combine a more locally-acting compound with a more systemic one. Both rest almost entirely on animal data — the pairing is popular, not proven.
Pairs a gut-repair reputation with an immune-modulating peptide. Thymosin Alpha-1 is actually approved in some countries for immune uses, which sets it apart from most of this list.
Combines a repair reputation with the copper peptide known from skincare, aimed at connective-tissue and skin quality. GHK-Cu's best evidence is topical/cosmetic, not injected.
The standard "GHRH analog + GHRP" pairing — the two hit growth-hormone release through different receptors, so they're combined for a larger, cleaner pulse. Often the first GH-adjacent stack people hear about.
Another GHRH + GHRP combination, leaning on compounds with more regulatory history (sermorelin was once an approved diagnostic drug). Usually framed around a nighttime GH pulse.
Pairs the one GHRH analog with an FDA-approved use (tesamorelin, for HIV-related visceral fat) with a selective GHRP. The interest here is body composition rather than raw recovery.
Notice the pattern: healing stacks pair a local + systemic repair story, and GH stacks pair a GHRH analog + a GHRP. Understanding the two categories explains almost every combination you'll see. The glossary defines each term.