NAD+ is a coenzyme — a dinucleotide — and one of the handful of items in this catalog that is not a peptide. It is a small, thoroughly characterised molecule, filed in the senescence and cellular-longevity research collection.
It ships as a single, consistent reference lot, sent for independent purity testing, and that lot's certificate is posted to its verification page as soon as testing is complete.
Being a small, well-defined molecule rather than a peptide, its record is unusually clean. There is no sequence to interpret and no chain length to reconcile — confirming its structure confirms the substance, which is not something every item in this catalog can say.
For laboratory research use only. Not for human or veterinary use.