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I prefer to drink coffee cold. So, after the coffee is done brewing, I leave it to rest for some time and drink it later.

Will the coffee lose its strength, if it is cooling down?

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marked as duplicate by Chris_in_AK, Mayo, Ivan Kapitonov, PythonMaster, hoc_age Jan 26 at 19:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 6 down vote accepted

Yes, but not in any significant or noticeable amounts. Caffeine is stable in solution for quite some time. Considering a average cup of coffee (~100mg of caffeine), you may lose a few milligrams of caffeine over an extended rest period. Given that caffeine content varies in any given cup of coffee (many sources list variations as wide as 60mg to 200mg, or more) you are unlikely to notice any difference in the caffeine content.

What you may notice is a difference in the taste. They are many suggestions out there on how to cold brew coffee. It may be worth your time to research an alternate brewing method.

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The caffeine that's lost - where does it go? – Robert Jan 21 at 21:47

Largest drops observed after a 24 hour period were 4.1% during this study:

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what does that mean? – rogerdeuce Jan 21 at 20:18
While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review – Chris_in_AK Jan 21 at 23:09

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