Proper ingredients are vital in creating a potion.
Potion ingredients are available for student use from the Student Store cupboard. Students also buy their own ingredients as part of their school supplies, and purchase additional materials and refills every year. Many witches and wizards buy their potion-making supplies at the Apothecary in Diagon Alley. Snape maintains his own private stores which include ingredients not available in the Student Store Cupboard, including boomslang skin and gillyweed.
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aconite
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Acromantula venom
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armadillo bile
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Ashwinder eggs
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asphodel
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bezoar
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belladonna
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bicorn parts
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Billywig parts
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black beetle parts
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boomslang parts
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bubotuber
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Bundimun secretion
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Cabbage, Chinese Chomping
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caterpillars
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cockroaches
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crocodile parts
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daisy
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Doxy eggs
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dragon eggs
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dragon parts
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Erumpent parts
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flobberworm parts
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fluxweed
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frog parts
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ginger
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Glumbumble parts
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Graphorn parts
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hellebore
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horned slugs
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horned toads
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human parts
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Jobberknoll parts
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knotgrass
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lacewing flies
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leeches
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lionfish parts
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lovage
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mandrake
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monkshood
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moonstone
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nettles
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peppermint
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pomegranate
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porcupine parts
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puffer-fish parts
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rat parts
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Re'em blood
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runespoor eggs
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salamander parts
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scarab beetles
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scurvy-grass
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shrivelfig, Abyssinian
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snake parts
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sneezewort
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sopophorous
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spiders
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tubeworms
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unicorn parts
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valerian
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wolfsbane
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wormwood