NAD+ vs Epithalon: How They Differ

NAD+ and Epithalon are two completely different molecules that tend to show up in the same research catalogue because both are studied in the field of cellular aging. NAD+ is a coenzyme, a small molecule that participates in redox reactions inside the cell. Epithalon is a synthetic tetrapeptide. They share no structure, no mechanism and no origin — the only reason they get compared is that the cellular-longevity literature discusses them in the same kind of studies.

What is NAD+

[NAD+](/en/product/nad-plus/) (nicotinamide adenine dinucleotide) is a coenzyme present in every living cell. Biochemistry describes it as an electron carrier in the oxidation-reduction reactions that sustain cellular energy production, and as a substrate for enzymes such as sirtuins and PARPs, which participate in DNA repair and metabolic regulation.

Chemically, NAD+ is a dinucleotide: two nucleotides joined by a phosphate bridge, one carrying an adenine base and the other nicotinamide. Its molecular weight is approximately 663 Da. It is not a peptide, even though it sits alongside research peptides on the shelf because it shares the same subject matter.

The literature describes a decline in intracellular NAD+ levels associated with aging, which is why the molecule has become a central object of study in research on longevity, mitochondrial metabolism and cellular stress.

What is Epithalon

[Epithalon](/en/product/epitalon/) is a synthetic tetrapeptide: four amino acids in the sequence Ala-Glu-Asp-Gly (alanine-glutamate-aspartate-glycine). It is the synthetic version of epithalamin, a peptide extract from the pineal gland originally isolated in Russian research from the 1980s and 1990s.

Its molecular weight is approximately 390 Da, considerably lower than that of NAD+. The research line around it centers on telomerase activity and telomere length, along with studies on circadian rhythms and the pineal gland. It is a structurally simple molecule compared with longer peptides in the same catalogue, such as growth hormone-releasing hormone analogs.

The main differences

Placed side by side, the differences are not subtle:

• Chemical class: NAD+ is a dinucleotide coenzyme; Epithalon is a four-amino-acid peptide.
• Size: NAD+ weighs almost double Epithalon — approximately 663 Da versus 390 Da.
• Origin of the molecule: NAD+ is endogenous, naturally present in every cell; Epithalon is the synthesis of a sequence derived from a glandular extract, not a molecule the body produces identically on its own.
• Metabolic pathway the literature studies: NAD+ is researched in the context of redox reactions and NAD-dependent enzymes (sirtuins, PARPs); Epithalon is researched in the context of telomerase and pineal regulation.
• Stability: as a coenzyme, NAD+ is more sensitive to degradation in solution than a short, stable peptide like Epithalon, which affects how storage conditions are documented for each batch.

Neither molecule is "better" than the other — they are research subjects for different questions, and comparing their purity or potency does not make sense because they are not measured against the same yardstick.

Research use only

Both NAD+ and Epithalon are supplied strictly as research material (RUO, Research Use Only), for laboratory and in vitro research. Neither is a medicine, a supplement or a food. Neither is approved for human or veterinary consumption, diagnosis or treatment, and no regulatory authority — not the FDA, not ANMAT, nor any equivalent body — has evaluated these statements. This article does not describe usage protocols or administration guidelines: it describes what the molecules are and what the scientific literature investigates about them.

Batch documentation and purity

The purity standard [PeptoClinic](/en/quality/) applies to the research peptides in its catalogue is 99% or higher by HPLC. Each compound is quoted as laboratory material, with batch documentation available to the researcher who requests it. Before comparing two suppliers on declared purity, it is worth asking for an external laboratory's report with a batch number and analysis date — not a screenshot or a generic seal — and confirming that the report matches the specific batch being quoted.

Shipping to Argentina

PeptoClinic quotes research material for shipment to [Argentina](/en/argentina/), including NAD+ and Epithalon, with customs documentation prepared for entry as laboratory reference material. The full catalogue, with a technical sheet for each compound, is available on the [catalogue page](/en/catalog/).