What are alchemy ingredients used for beyond the initial creation of a potion?

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In the Witcher 3, there are alchemy ingredients littered all over the map. From the in game tutorials though, it states you only need to create a potion once, and then after that, when you meditate, alcohol will refill your potions automatically. So what am I supposed to do with all the extra alchemy ingredients?
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What ingredients are in Witcher 3 alchemy?
The Witcher 3: 10 Most Useful Alchemy Ingredients, Ranked By How Hard They Are To FindWhere can I find alchemy ingredients?
You can find a large amount of alchemy ingredients robbing alchemists shops and houses. You can also get a large amount of ingredients from the Arch Mages room in Winterhold College.How do you get a lot of alchemy ingredients in Skyrim?
Skyrim: 15 Best Locations To Gather Alchemy IngredientsHow to MAKE EVERY POTION (Alchemist Roblox Bedwars Kit)
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Images: Anna Shvets, EKATERINA BOLOVTSOVA, EKATERINA BOLOVTSOVA, Pili Toro