Melatonin is one of the few small molecules in this catalog rather than a peptide. It is a small, thoroughly characterised compound long used as a laboratory reference, filed in the senescence and cellular-longevity research collection.
We stock it as a single reference lot, submitted for independent testing, and the resulting certificate of analysis is published to its verification page when finalised.
The nice thing about a small molecule like this is that its name describes its structure exactly, so there is none of the identifier ambiguity that trips up peptide records. A search on the name lands where it should the first time, and there is no chain to interpret or reconcile.
For laboratory research use only. Not for human or veterinary use.