Why is Caffeine Not Haram?
What is prohibited is khamr (wine) or anything with its effects of inebriation (taskir).
The Prophet (peace and blessings be upon him) said, “Every intoxicant is unlawful.” [Bukhari, Muslim]
He (peace and blessings be upon him) also once explained the basis of why khamr is unlawful when he said, “Khamr is that which covers [or clouds] the intellect.” [Bukhari, Muslim]
So what is meant by intoxicant in this context is that which “covers the intellect,” i.e., causes inebriation or drunkenness like beer, or euphoria such as cocaine or amphetamines. These are all unlawful.
Caffeine is not an intoxicant in that sense, but rather only a mild stimulant and hence permissible.
And Allah knows best.
Answered By: Shaykh Asif of Halal or Haram Team