The Hulk Stack: a two-peptide GH-axis research set

The Hulk Stack is a two-peptide research set that pairs CJC-1295 with DAC and Ipamorelin, 20mg total. Think of it as the growth-hormone-axis counterpart to our tissue-repair sets: two compounds that reach the same pituitary cells through different receptors. In the United States the same pairing turns up under several labels, but the name is a convention rather than a trademark, and what separates one supplier's version from another's is the exact variant used, the purity and the documentation, not the label.

For laboratory research only. This set is sold exclusively for in-vitro research. It has not been evaluated by the FDA, nothing on this page covers dosing, administration, or use in people or animals, and no therapeutic claim is made.

The DAC distinction: read this first

Get this right before anything else, because it is the point most often muddled in the literature and in supplier catalogs.

CJC-1295 comes in two forms, and they are not interchangeable:

DAC is short for Drug Affinity Complex, a conjugated group that binds covalently to serum albumin. Because albumin stays in circulation for a long time, tethering the peptide to it sharply lengthens how long the compound persists, compared with the unconjugated version, which clears quickly.

For a study design, the upshot is that the two variants produce very different exposure profiles. If your protocol relies on short, pulsatile exposure, the No-DAC form is the one you want; if it relies on sustained receptor occupancy, the DAC form is. Grabbing the wrong one is no small substitution.

The Hulk Stack contains the DAC form. The CJC-1295 we sell as a single compound is the No-DAC form. See what is CJC-1295? for the single.

What each compound is

• CJC-1295 (with DAC) is a synthetic analog of growth-hormone-releasing hormone (GHRH 1-29) carrying amino-acid substitutions that improve stability, plus the DAC conjugate. It binds and activates the GHRH receptor on pituitary-derived cells.
• Ipamorelin is a synthetic pentapeptide growth-hormone secretagogue, refined from GHRP-1. It acts as an agonist at the ghrelin / GH-secretagogue receptor (GHSR-1a) on pituitary somatotrophs. See what is Ipamorelin?

Why the two are studied together

Because they engage distinct receptors on the same cells. That is what makes the pairing informative rather than redundant: you are not stacking two compounds that do the same job, you are feeding two inputs into one system.

Running both in a single experimental setup lets researchers weigh convergent against independent signaling: whether downstream responses are additive, synergistic, or unrelated under defined exposure conditions. It also supports work on receptor cross-talk and dual-pathway regulation within the somatotropic axis.

One further point, specific to Ipamorelin: published work reports that at the concentrations effective for stimulating growth-hormone release in experimental models, it does not trigger adrenocorticotropic hormone (ACTH) or cortisol secretion, unlike some earlier GHRPs such as GHRP-2 and GHRP-6. That selectivity is why it is often the secretagogue of choice when the goal is to isolate GH-specific signaling from wider hypothalamic-pituitary-adrenal activity.

What the research actually examines

It is worth separating what the primary literature measures from the benefit lists that circulate around growth-hormone peptides. The published work on both compounds is in-vitro and preclinical: receptor binding, receptor activation, and the intracellular signaling that follows defined exposures in cultured, pituitary-derived systems. Those readouts move with concentration, exposure time and model, and there is very little published work on the two-compound combination itself. Claims about what "the Hulk Stack does" are therefore extrapolations from single-compound studies, not findings about the pairing, and extrapolating from separate in-vitro results to a combined effect in a living system is not a step the evidence supports. That does not make the set uninteresting as a research tool; it means the research question and the marketing claim are different things.

What the grouping does and does not claim

The set is a research convenience format. It makes no claim about a combined effect. Both compounds are supplied so a laboratory can obtain a consistent, documented pairing instead of sourcing and matching two lots separately. Reported responses shift with concentration, exposure time and model system, and this is in-vitro and preclinical work only.

What the Hulk Stack is not

• It is not an approved medicine in the United States or anywhere else, has not been evaluated by the FDA, and is not supplied for human or veterinary use.
• It is not the No-DAC pairing. The CJC-1295 and Ipamorelin guide covers the version built on the No-DAC single; the Hulk Stack uses the DAC form, which has a substantially different exposure profile.
• It is not a branded formulation. The name is an industry convention, so two suppliers' "Hulk" sets can differ in variant, ratio, purity and format.

Handling and verification

The set ships with batch-specific Certificate of Analysis documentation. Refrigerate at 2-8°C on arrival, keep the vials sealed and out of the light, and do not freeze them. See how to store research peptides.

Browse the Hulk Stack, or the components on their own as CJC-1295 (No DAC) and Ipamorelin. For the pairing studied without the DAC modification, see CJC-1295 and Ipamorelin.

How it ships in the US

For US laboratories the Hulk Stack is supplied pre-mixed rather than as a lyophilized powder, prepared under controlled conditions and HPLC-verified, with a batch-specific Certificate of Analysis reporting HPLC for purity and mass spectrometry for identity. Every compound is synthesized in our own UK laboratory rather than imported and repackaged, and each US batch is verified in a US laboratory before it ships. Orders are dispatched cold-chain from the warehouse that serves the United States, with tracked delivery across the country next business day, priced in US dollars and payable by Visa, Mastercard or Apple Pay. Store refrigerated at 2-8°C on arrival, not frozen. The components are also available individually: CJC-1295 (No DAC) and Ipamorelin.

Dosing and administration

We do not publish dosing, reconstitution-for-use or administration guidance for the Hulk Stack. The material is supplied strictly for in-vitro laboratory research and is not for human or veterinary use, so quantity guidance aimed at a person would be inconsistent with what is actually supplied. Experimental concentrations are specific to the model and endpoint and belong in the primary literature.