# Research Peptide Fundamentals research peptides — pureformpeptide > pureformpeptide covers Research Peptide Fundamentals research peptides — Ipamorelin, CJC-1295, NAD+ and MOTS-c — framed through the growth-hormone axis and longevity research. Peer-reviewed citations, plain-English summaries. Not a vendor, not a clinic. Four compounds at the intersection of the GH axis and the biology of cellular aging — one endogenous coenzyme, two GH secretagogues, one mitochondrial-encoded peptide. Summarized from the peer-reviewed literature, with citations. ## The short version pureformpeptide is a reading desk, not a store. It covers four research compounds that keep showing up in the same conversation — about how the body ages, how growth hormone declines, and whether cellular biology can be supported by external molecules. A *peptide* is a short chain of amino acids, far smaller than a protein; the other compound here, NAD+, is not a peptide at all but an endogenous molecule that every cell in your body depends on to make energy and repair DNA. This desk does one job: it tells you, in plain language and with numbered citations, what each compound was actually studied for, in which species, and how far that evidence reaches into human beings. Most of the peptide research stops well short of controlled human trials. None of these compounds is an approved medicine. We never list a human dose or give any form of medical advice. Read each compound page and then see how they compare on the [compare these peptides](/compare) page. ## What this desk covers The four compounds here were chosen because they each illuminate a different part of the growth-hormone axis and longevity research landscape: - [**NAD+**](/nad) is the lead — an endogenous dinucleotide that powers cell metabolism and fuels the sirtuin and PARP enzymes central to DNA repair and cellular aging. It is categorized as a dietary supplement (or its precursors are), not a drug, and it has the most extensive human clinical trial record of the four [11][12][13]. - [**Ipamorelin**](/ipamorelin) is a selective GH secretagogue, a synthetic pentapeptide that activates the ghrelin receptor on pituitary cells to pulse growth hormone — without the cortisol and prolactin side effects of earlier peptides in its class [3][4]. - [**CJC-1295**](/cjc-1295) works at the GHRH receptor rather than the ghrelin receptor, driving sustained multi-day elevation of both GH and IGF-1. Its long-acting DAC form is a pharmacological contrast to the brief pulse that ipamorelin produces [9][10]. - [**MOTS-c**](/mots-c) sits furthest from the clinic: a 16-amino-acid peptide encoded inside mitochondrial DNA, released during exercise, that activates AMPK through an unusual folate-cycle mechanism and travels to the nucleus under metabolic stress [20][22]. ## The growth-hormone axis and longevity research, side by side Why frame these four together? Because they each address a different node in the same biological question: what happens to energy production, growth-factor signaling, and cellular repair as the body ages — and is any of that reversible? The GH axis declines with age (somatopause). NAD+ falls across tissues (partly because the NAD-consuming enzyme CD38 rises) [16]. MOTS-c expression from mitochondria is inducible by exercise and may encode one of the body's signals for metabolic adaptation [21]. GH secretagogues like Ipamorelin and CJC-1295 were originally investigated to restore GH pulsatility — the FDA reviewed them both for this class-level question and found neither qualified for compounding pharmacy access. Covering them side by side lets a reader see both the convergences — the GH/IGF-1/AMPK/sirtuin cluster that keeps appearing in longevity research — and the important differences in evidence quality. NAD+ precursors have multicenter RCTs [12]; CJC-1295 has early human PK studies [9]; MOTS-c's interventional evidence is entirely in mice [21]. This desk holds those distinctions plainly in view. ## What are research peptides? A *peptide* is a chain of amino acids — the same building blocks that proteins are made from, only far shorter. Most peptides in the body act as signaling molecules: hormones, neurotransmitters, or intracellular messengers. A *research peptide* is one that has been synthesized and studied in the laboratory — in cell cultures, in animals, and occasionally in early human trials — but has **not** been approved by a regulatory body as a medicine. Sellers describe these compounds as being for laboratory research use only. That framing is not just legal language: it reflects a real gap in the evidence. Dosing, long-term safety, and real-world effectiveness in people are largely uncharacterized for most research peptides. When this site reports a finding, it reports it exactly as the study did — for example, *studied at 0.5 mg/kg/day subcutaneously in 22-month-old mice* — and never as a recommendation for what any person should do. --- An independent literature desk for the growth-hormone axis and longevity research — what the peer-reviewed record actually shows, stated plainly and cited precisely.