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Hai Zao is a seaweed materia name, not one interchangeable species. The cited HKBU record includes Sargassum pallidum and S. fusiforme, whose branching form and air bladders differ. A dried thallus can lose those features, so record the accepted Latin name, harvest coast, depth or farm source, season, and lot-testing documents. Seaweed may accumulate iodine, arsenic, heavy metals, or other contaminants depending on species and site; clear water in a picture says nothing about a real harvest location. Never collect from harbors, sewage outfalls, or protected reefs, and do not assume that rinsing removes accumulated contaminants. Traditional incompatibility lists sometimes pair Hai Zao with licorice, but modern evidence does not establish a universal toxicity threshold or safe ratio. This warning is not a recommendation to try the pair at a smaller amount. A land-plant cultivation calendar is not applicable: seaweed growth depends on species, salinity, light, substrate, and marine farming conditions. Keep source identity and product testing attached to the sample. A Sargassum record should include coastal source and species, not only “brown seaweed.” The thallus can branch and may carry air bladders, but these features vary by accepted source and can be damaged during drying. Species misidentification, harvest-site contamination, and iodine concentration are separate quality questions. A clean-looking seaweed bundle does not reveal arsenic or heavy metals; those require testing. Do not collect from ports, sewage outlets, or restricted reefs, and do not infer that a kitchen rinse removes accumulated contaminants. Traditional Hai Zao–licorice incompatibility lists are historical; modern evidence does not provide a universal safe ratio. The absence of a numeric toxicity threshold is not permission to experiment with a smaller amount. When documenting seaweed, record Latin name, wild/farmed origin, harvest date, water conditions, drying, and batch analysis. The site’s living underwater image is explanatory, not a statement that every Sargassum species or coastline is interchangeable. Wild and farmed seaweed require different source records. For wild material, record the coast and collection permission; for farmed material, record the cultivation site and harvest batch. Neither record replaces species identification and contaminant testing. A generic “seaweed” label is inadequate for a materia entry because accepted Sargassum sources and iodine/contaminant profiles may differ.