nad reconstitution: Frequently asked questions

Minor colour variation (pale cream to off-white) is normal and doesn't indicate degradation. But dark yellow or brown discolouration suggests oxidative damage. NAD+ is hygroscopic (absorbs moisture from air) and photosensitive; prolonged exposure to light or humidity during storage causes oxidative degradation visible as yellowing. If the powder is dark yellow or brownish, contact the supplier for a replacement. Oxidised NAD+ has reduced bioactivity and may contain degradation byproducts. Slight off-white colouration in a properly sealed, refrigerated vial is typically cosmetic and doesn't affect potency, but when in doubt, third-party testing (HPLC analysis) provides definitive purity verification.

Discard it immediately. Cloudiness indicates protein aggregation or bacterial contamination, neither of which can be reversed. Clear NAD+ solutions should be colourless to pale yellow with no visible particulates. Cloudiness means the peptide molecules have clumped together (aggregation) or foreign matter is present. Injecting aggregated peptides can trigger immune responses; injecting contaminated solutions risks abscess formation. The cost of replacing a $60 vial is trivial compared to the infection risk or lost research time from using compromised material.

Assume 30–50% potency loss and adjust your protocol accordingly or discard it. NAD+ hydrolysis at room temperature (20–25°C) over 8–12 hours degrades the glycosidic bonds and pyrophosphate linkages significantly. You can't visually detect this degradation. The solution still looks clear. But bioavailability is compromised. If the research timeline allows, start with a fresh vial. If you must use the compromised vial, increase the dose proportionally (e.g., 150 mg instead of 100 mg) to compensate, understanding that you're estimating degradation level without lab verification.

Use the reconstituted solution within 24 hours and refrigerate between doses. Sterile water lacks the benzyl alcohol preservative that allows bacteriostatic water to remain antimicrobial for 28 days. Without it, bacterial contamination risk increases dramatically after the first needle puncture. Sterile water reconstitution is acceptable for single-use applications (one vial, one dose, immediate injection) but unsafe for multi-dose vials where you'll access the same vial multiple times over weeks. If you've already reconstituted with sterile water, draw all doses into individual sterile syringes immediately, cap them, and refrigerate. This minimises contamination risk by reducing vial access frequency.

Yes, but only if your dose strength is low enough and your vial size is large enough. A 1000mg vial reconstituted in 10mL at 100mg/mL concentration yields 30 doses if you draw 0.33mL per injection (33mg per dose). A 2000mg vial at the same concentration yields 60 doses at 33mg each. The constraint is the 28-day refrigerated stability window. If your injection frequency is twice weekly, 30 doses would take 15 weeks to deplete, which exceeds the safe storage period. In that case, reconstitute half the powder in a smaller volume, store the remaining lyophilised powder at −20°C, and reconstitute the second batch when the first is depleted.

The reconstituted solution volume should equal the bacteriostatic water volume you added. The lyophilised powder dissolves without significantly increasing total liquid volume. If you added 5mL of water and the vial appears to contain only 4.5mL, either (1) you didn't inject the full 5mL, or (2) some solution is trapped in the lyophilised cake and requires additional gentle swirling to fully dissolve. Never shake NAD+ vials vigorously. It denatures the compound. Swirl gently until all powder dissolves and the solution is clear.

No. Once bacteriostatic water is added, the concentration is set. If you intended to reconstitute 500mg in 5mL but accidentally added 10mL, your concentration is now 50mg/mL instead of 100mg/mL. You can't remove water from the vial without contaminating the solution. Your only option is to adjust your drawing volume to compensate. If you wanted 50mg per dose, you now need to draw 1.0mL instead of 0.5mL. The total number of doses remains the same (the vial still contains 500mg total), but each injection volume doubles.