NAD+ vs Epithalon: How They Differ

NAD+ and Epithalon are two completely different molecules that tend to show up together 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.

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.

Regulatory status

Neither NAD+ nor Epithalon is approved by the FDA or ANMAT. A physician reviews every consultation at PeptoClinic. 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 peptides in its catalogue is 99% or higher by HPLC, with batch documentation available on request. 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 ships to [Argentina](/en/argentina/). Prices are on the pricing page; anything not listed there can be asked about through a consultation. The full catalogue, with a technical sheet for each compound, is available on the [catalogue page](/en/catalog/).