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Someone running a circadian rhythm study or an in-vitro binding assay usually pulls this from -20°C storage right before reconstituting it, so they're not chasing degraded product mid-experiment.
It's basically a white crystalline powder at 99% purity or better per HPLC, and that CAS (73-31-4) matches the standard melatonin backbone — nothing exotic about the molecular formula, C13H16N2O2, and the molecular weight of 232.28 g/mol is what you'd expect for endogenous melatonin.
We've handled enough bulk orders to know solvent batches with lower water solubility can cause headaches; at 5 mg/mL in water it dissolves fine for most application, though typical lead times for 100-gram runs run 15-20 working days or so (usually 2-4 weeks).
What it's not suited for is any kind of direct human supplementation at food-grade labeling — it's classified strictly as a research chemicla, and we're clear on that with packaging in alumnum foil bags or sealed drums.
Buyers often ask about stability after the initial freeze-thaw cycle, and honestly, it's stable under recommended conditions for the full 24-month shelf life if you keep it dark and dry at -20°C; the density of 1.43 g/cm³ doesn't matter much unless you're calculating bed volume in a column.
We usually have stock on standerd quantities — MOQ is typically 100 grams — but confirm lead time if you're pushing beyond that, because custom drum sizes add a week to packing schedules.
