I gots a tip for ya. Making slow poisons boost your alchemy skill the fastest. They require deathbells and salt piles.
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Giant toes and creep root's get you there pretty fast too.
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They are a bit rarer though, plus, i have the guide so i spent a couple hours one day opening up every single effect on every ingredient. Out of all the potion/poisons i found slow's to boost the fastest. Also, Slow poisons sell for a pretty penny.
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They are easy to farm... So long as you can kill giants.
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Deathbells, salt piles and....
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you only need two ingredients for any potion or poison. the third is only for added effects. Anywho, river bettys also have slow on them i think.