How Long Does NAD+ Last? Storage Before and After Mixing

Sealed lyophilised NAD+ keeps best cold, dry and dark; once mixed with bacteriostatic water it belongs at 2 to 8 °C, where reagent data show a water solution keeping at least 99% of its NAD after 4 weeks. NAD+ is not a peptide, so the 8 to 12 week peptide window does not automatically carry over: it breaks down by a different chemistry, faster in alkaline conditions and faster when warm. Room temperature is for handling only, a mixed vial is not refrozen, and light is kept off it. The ready-mixed NAD+ Nasal Spray is a concentrated solution and is kept cold from the day it arrives.

Findings

• NAD+ is a dinucleotide, not a peptide: two nucleotides joined through their phosphate groups, as explained in NAD+ is not a peptide.
• A classic 1961 study found that the oxidised forms (NAD+ and NADP+) are destroyed by alkali, while the reduced forms are destroyed by acid.
• Roche’s data for reagent-grade NAD report that a 10 mg/mL water solution keeps at least 99% of its NAD after 4 weeks at 2 to 8 °C.
• In a 2024 study held at 19 °C for 43 days, NAD+ lost about 4% in Tris buffer but degraded nearly entirely in HEPES: what it is dissolved in matters.

How long does lyophilised NAD+ last?

Dry NAD+ is far more stable than any solution of it, because the hydrolysis that breaks it apart needs water. Keep the sealed vial at 2 to 8 °C for everyday storage, or frozen for long-term storage, in its box and away from moisture. A cold vial is allowed to reach room temperature before it is opened, so condensation does not wet the powder. A few days at room temperature in transit is not a concern for the sealed vial. The general rules are in how to store research peptides, which apply to NAD+ even though it is not a peptide.

How long does NAD+ last after mixing?

The best-documented figure comes from the reagent supplier’s own data: a 10 mg/mL water solution of reagent-grade NAD kept at least 99% of its NAD after 4 weeks at 2 to 8 °C (Roche NAD, product information). Vistara Labs has not published a separate NAD+ window, and the 8 to 12 week figure in how long peptides last after mixing was written for peptides. The cautious reading is to date the vial at mixing, keep it at 2 to 8 °C in the dark, and treat 4 weeks as the point backed by data. The NAD+ reconstitution page has the calculator for water volume and concentration.

Form	Storage	What the data support
Lyophilised vial, sealed	Fridge, or freezer long term; dry, dark	Its most stable form
Mixed with bacteriostatic water	2 to 8 °C, upright, dark	At least 99% NAD after 4 weeks at 10 mg/mL (reagent data)
Ready-mixed nasal spray	2 to 8 °C, upright, capped	Kept cold from arrival
Any solution, warm or alkaline	Avoid	Faster breakdown

What breaks NAD+ down?

NAD+ is held together by a bond between nicotinamide and its ribose sugar, and by a pyrophosphate link between its two halves. Water attacks those bonds slowly, and alkali speeds the attack: in 1961, Lowry and colleagues showed that oxidised pyridine nucleotides are destroyed by alkali without loss of the reduced forms, and the reverse with acid (Lowry et al., J Biol Chem, 1961). Warmth adds to it. The buffer also counts: in a 43-day study at 19 °C, NAD+ in Tris lost about 4% of its absorbance signal, while NAD+ in HEPES degraded nearly entirely (Wolfe et al., Molecules, 2024). Bacteriostatic water carries no buffer, which keeps that variable out of a mixed vial. Concentration matters too: the reagent data describe more concentrated solutions losing content faster than dilute ones, which is worth remembering with a 500 mg vial.

How can you tell mixed NAD+ has degraded?

Freshly mixed NAD+ is a clear solution. Discard it, whatever the date, if it turns cloudy, shows particles, or yellows or darkens over time. Hydrolysis of NAD+ produces nicotinamide and ADP-ribose, both colourless, so most chemical loss is invisible; that is why the mixing date matters more than appearance for NAD+.

Travelling with NAD+

Every order ships from within Canada by Canada Post Xpresspost, and the sealed vial travels without refrigeration. A mixed vial or spray that has to travel goes in an insulated bag with a cold pack, wrapped so it cannot freeze against the pack, and back into the fridge on arrival. A warm car is the worst place for an NAD+ solution, since heat is one of the two main accelerators of its breakdown.

NAD+ nasal spray storage

The NAD+ Nasal Spray comes ready-mixed at 50 mg per mL in a sealed metered pump delivering 0.175 mL per press, in 250 mg and 500 mg bottles. It is the most concentrated solution in the spray range, which is one more reason it is kept at 2 to 8 °C, upright, capped and away from light, and never frozen. NAD+ is also part of the Cognitive Clarity Spray Stack. Handling and priming are covered in how to store a peptide nasal spray, and the press count per bottle in how many sprays are in a peptide nasal spray.

Frequently asked questions

How long does NAD+ last in the fridge?

Reagent data show a 10 mg/mL water solution of NAD keeping at least 99% of its content after 4 weeks at 2 to 8 °C. The sealed lyophilised vial lasts much longer than any solution.

How long does NAD+ last at room temperature?

The sealed powder tolerates short periods such as transit. A mixed NAD+ solution is kept at 2 to 8 °C, because warmth speeds its breakdown.

Can you freeze NAD+?

The sealed lyophilised vial can be frozen for long-term storage. A mixed vial or spray that will be used again should not go through freeze-thaw cycles.

Does NAD+ go bad?

Yes. In solution, NAD+ slowly hydrolyses to nicotinamide and ADP-ribose, faster when warm or alkaline. The loss is mostly invisible, so the mixing date is the main guide.

Is NAD+ storage the same as peptide storage?

The handling is the same: cold, dark, upright, swabbed stopper. The chemistry is different, because NAD+ is a dinucleotide rather than a peptide, so the peptide window does not automatically apply.

Handling guidance: Vistara Labs, October 2026. Sources: Lowry OH, Passonneau JV, Rock MK. The stability of pyridine nucleotides. J Biol Chem. 1961. PMID 14466980. Wolfe KD, Alahuhta M, Himmel ME, Bomble YJ, Jennings GK, Cliffel DE. Long-term stability of nicotinamide cofactors in common aqueous buffers: implications for cell-free biocatalysis. Molecules. 2024. PMID 39598842. Roche NAD, free acid, product information, via Sigma-Aldrich (sigmaaldrich.com).

More on this: NAD+ Restoration: What the Research Shows.