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NAD+ Circadian BMAL1 Research | Midwest Peptide

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NAD+ Circadian Research: BMAL1/CLOCK Oscillation Literature

Q: Is NAD+ approved for human use?

No. NAD+ is not approved by the FDA for any human therapeutic use. It is supplied strictly for in-vitro and preclinical research purposes by qualified investigators.

NAD+ · Published April 14, 2026 · Updated May 18, 2026 · 7 min read

Quick Answer

NAD+ circadian research examines BMAL1/CLOCK oscillation patterns and sirtuin-driven feedback regulation of cellular clocks. Studies measure diurnal NAD+ fluctuation, NAMPT expression rhythms, and circadian biomarker dynamics across cellular and rodent research models of integrated circadian metabolic biology. For research use only, not for human consumption.

NAD+ Circadian Research: BMAL1/CLOCK Oscillation Literature

Research Use Only. All products are strictly for research use only (RUO). Not for human consumption. Products on this site are not intended to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the FDA. By purchasing, you agree that you are a qualified researcher and that products will be used solely for in-vitro research purposes.

The Core Circadian Oscillator
NAD+ as a Circadian Regulated Molecule
SIRT1 as a Circadian Feedback Node
Metabolic Circadian Integration
Research Design Implications for NAD+ Studies
BMAL1 and NAD+ Biosynthesis
Relationship to Other Cluster Topics
Research Peptide Referenced
Related Research Reading
Related Research Articles
Explore Related Products
Frequently Asked Questions
Glossary

NAD+ circadian research is one of the more conceptually interesting extensions of the NAD+ research cluster. The circadian clock system and the NAD+ biosynthesis and consumption pathways are reciprocally connected, with the clock regulating NAD+ availability and NAD+ dependent enzymes feeding back to modulate clock function. Research on this interaction provides both mechanistic detail on NAD+ biology and practical considerations for research design in any NAD+ research that spans multiple time points across the day.

Frequently Asked Questions

What is NAD+ in research contexts?

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme present in every living cell, central to redox metabolism and serving as a substrate for sirtuins, PARP enzymes, and CD38. It is studied in research models for cellular energy, mitochondrial function, DNA repair, and aging biology.

How does NAD+ link to circadian biology?

Cellular NAD+ levels oscillate with circadian rhythm, regulated by NAMPT expression under BMAL1/CLOCK transcriptional control. SIRT1, an NAD+-dependent deacetylase, in turn modulates BMAL1 acetylation, creating a feedback loop between circadian and metabolic biology.

What circadian endpoints are measured in NAD+ research?

Endpoints include rhythmic gene expression (Bmal1, Per1, Per2, Cry1, Cry2), tissue NAD+ oscillation patterns, NAMPT expression cycling, and behavioral rhythms in light-dark cycle experiments. Tissue-specific phase analysis provides additional resolution.

Is NAD+ approved for human use?

Glossary

Key terms used in this article.

NAD+/NADH: The oxidized (NAD+) and reduced (NADH) forms of nicotinamide adenine dinucleotide, central to redox metabolism.
Sirtuin: A family of NAD+-dependent deacylase enzymes (SIRT1 to SIRT7) that regulate metabolism, stress response, and aging.
PARP: Poly(ADP-ribose) polymerase, a family of NAD+-consuming enzymes critical for DNA damage repair.
NMN: Nicotinamide mononucleotide, a direct biosynthetic precursor to NAD+ studied as a supplementation strategy.
NR: Nicotinamide riboside, an NAD+ precursor that is converted to NMN by NRK enzymes before incorporation into NAD+.
NAMPT: Nicotinamide phosphoribosyltransferase, the rate-limiting enzyme in NAD+ biosynthesis from nicotinamide via the salvage pathway.
BMAL1/CLOCK: The core transcription factor heterodimer driving the molecular circadian clock through rhythmic transcription of Per and Cry genes.

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The Core Circadian Oscillator

The mammalian circadian oscillator is built from a transcriptional translational feedback loop involving the core clock proteins BMAL1, CLOCK, PER, and CRY. BMAL1 and CLOCK form a heterodimer that activates transcription of PER and CRY genes and of many other circadian regulated genes. The PER and CRY proteins accumulate during the day, translocate to the nucleus, and suppress BMAL1 CLOCK activity, which completes the feedback loop. The cycle has a period of approximately twenty four hours and drives the circadian oscillation of thousands of downstream genes across most tissues.

The Nature subject hub on circadian rhythms archives primary research on the core oscillator and on its many downstream effects. The Cell Press journal Cell and the ScienceDirect circadian rhythm topic page provide additional entry points into the literature.

NAD+ as a Circadian Regulated Molecule

NAD+ concentrations oscillate across the day in many tissues. The oscillation is driven by the circadian regulation of NAD+ biosynthesis enzymes, particularly nicotinamide phosphoribosyltransferase, which is the rate limiting enzyme in the NAD+ salvage pathway. NAMPT gene expression is under direct circadian control through BMAL1 CLOCK binding to its promoter region, and NAMPT protein concentration oscillates with a peak during the active phase of the animal's behavioral cycle.

The oscillation of NAMPT drives oscillation of NAD+ availability, which in turn affects the activity of NAD+ dependent enzymes. This includes the sirtuins covered in the NAD+ in Research: A Comprehensive Review of Nicotinamide Adenine Dinucleotide Studies in this cluster and the PARP enzymes covered in the DNA repair research article. The net effect is that many NAD+ dependent cellular processes have circadian oscillations that are driven by NAD+ availability rather than by direct circadian regulation of their core components.

SIRT1 as a Circadian Feedback Node

SIRT1, the most extensively characterized sirtuin, feeds back on the circadian oscillator through direct interaction with core clock proteins. SIRT1 deacetylates BMAL1 and PER2, which affects their stability and transcriptional activity. The NAD+ dependent SIRT1 activity therefore modulates the clock function based on the NAD+ availability.

The feedback operates on at least two levels. First, SIRT1 deacetylation of BMAL1 enhances BMAL1 transcriptional activity during the rising phase of BMAL1 protein accumulation. Second, SIRT1 deacetylation of PER2 affects its stability and therefore the timing of the suppressive phase of the cycle. Both effects integrate NAD+ availability into the oscillator timing.

The integration creates a coupled system in which the clock regulates NAD+ availability and NAD+ availability regulates the clock. Mathematical modeling of this coupled system has documented the oscillatory behavior that emerges and the conditions under which the coupling supports robust rhythms versus more complex behavior. The Wiley Online Library chronobiology collection and the Frontiers in Cellular Neuroscience journal archive primary research on this coupling.

Metabolic Circadian Integration

The NAD+ circadian coupling has downstream effects on metabolic rhythms across tissues. Hepatic glucose metabolism, adipose lipid metabolism, and skeletal muscle substrate utilization all have circadian components that depend on NAD+ dependent pathways including sirtuin regulated gene expression and mitochondrial function. The integrated metabolic circadian rhythm therefore reflects the NAD+ oscillation as one of its driving inputs.

Research on NAD+ supplementation effects on metabolic rhythms has documented that adequate NAD+ availability supports robust metabolic rhythms and that NAD+ depletion or dysregulation is associated with dampened or disrupted rhythms. These findings extend the general aging and metabolic research on NAD+ into the specific context of circadian rhythm maintenance.

Research Design Implications for NAD+ Studies

The circadian oscillation of NAD+ has practical implications for research design across all NAD+ studies. Sampling of NAD+ levels or of NAD+ dependent enzyme activities should specify the circadian time of sampling, because the same animal produces different values at different times of day. Comparison across studies that sampled at different circadian times may not be valid without adjustment for the expected oscillation. Studies that intentionally sample across the circadian cycle provide more complete information than single time point studies.

The administration time of NAD+ supplementation also matters. Supplementation at the trough of the natural NAD+ oscillation has different downstream effects than supplementation at the peak. The choice of administration time should be documented explicitly in the research protocol, and comparative research across studies should align on this variable when possible.

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NAD+ Circadian Research: BMAL1/CLOCK Oscillation Literature