Haarlemmerolie is a natural supplement that can be taken for a range of ailments. The potion is a mixture of sulfur, herbs and terebinth oil. It is produced in Haarlem, the Netherlands.

It was invented in 1696 by Claes Tilly and was marketed as a cure for many ailments.

The word "haarlemmerolie" (with a lowercase 'h') is now used in Dutch to indicate a fix for all problems. I.e., "lowering taxes will be like haarlemmerolie for the economy". This is also used sarcastically.

The medicine is also called "medicamentum gratia probatum".

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