Which famous people take GABA?

Andrew Huberman

100 mg every third or fourth night, together with 2 g glycine

Taken occasionally alongside glycine as an optional add-on to his sleep stack.

“every third or fourth night, I will take two grams of glycine and 100 milligrams of GABA”Andrew Huberman

Source: Sleep Toolkit: Tools for Optimizing Sleep & Sleep-Wake Timing (podcast, 8 Aug 2022)