Question 1

What is NAD+?

Accepted Answer

NAD+ (nicotinamide adenine dinucleotide, oxidized form) is a coenzyme present in every living cell and one of the most widely used reagents in metabolic biochemistry. It acts as an electron carrier in redox reactions across glycolysis, the citric acid cycle, and oxidative phosphorylation, and it is the required substrate for three enzyme families: sirtuins, PARPs, and CD38. Laboratories use it as a standard in enzyme assays and in mitochondrial metabolism research. Prime Science Supply supplies NAD+ as a Research Use Only reagent — not a drug, supplement, or food ingredient.

Question 2

What is the difference between NAD+, NMN, and NR?

Accepted Answer

NAD+ is the active coenzyme itself. NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside) are biosynthetic precursors that sit upstream of NAD+ in the salvage pathway: NR is phosphorylated to NMN by nicotinamide riboside kinase, and NMN is converted to NAD+ by NMNAT enzymes. The three differ in molecular weight, charge, stability in solution, and cellular uptake, which is why experimental designs select deliberately between them rather than treating them as interchangeable. All three are handled as laboratory reagents under Research Use Only terms and are not intended for human or veterinary use.

Question 3

What does purity of at least 98% by HPLC-UV mean?

Accepted Answer

High-performance liquid chromatography with ultraviolet detection separates the components of a sample and measures the area under each resulting peak. A result of at least 98% purity means the peak corresponding to the target peptide accounts for at least 98% of the total detected area, indicating that truncated sequences, deletion products, and synthesis byproducts are present only in trace amounts. HPLC-UV is the standard characterization method for synthetic peptides in pharmaceutical and academic laboratories. 98% is the specification, which is a floor: the measured result for an individual lot is often higher. Where a Certificate of Analysis is issued for a lot, it reports the chromatographic result for that specific lot; CoA availability and level of detail vary by product and by lot.

Question 4

How should lyophilized peptides be stored?

Accepted Answer

Lyophilized peptide powder should be kept dry, sealed, and protected from light. Refrigeration at 2-8 °C is appropriate for short-term holding, while −20 °C or lower is used for extended storage of laboratory inventory. Moisture is the main variable to control, so a vial is best brought to ambient temperature before it is opened, preventing condensation from forming on the cold powder. Repeated freeze-thaw cycling should be avoided, since each cycle contributes to gradual degradation. Stability characteristics differ between sequences; consult the published literature for the specific peptide and any Certificate of Analysis issued for the lot.

NAD+ (500 mg)

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