Grapefruit juice
Product
Contains Naringenin, a flavone that inhibits the cyp1 A2 enzyme, thereby extending the half-life of caffeine in the body.
Mentioned in 2 videos
Videos Mentioning Grapefruit juice

Michael Pollan Interview | The Tim Ferriss Show (Podcast)
Tim Ferriss
An everyday substance that can significantly change the metabolism of many drugs and cause horrible side effects.

Q&A: Insulin resistance and hypertrophy, stimulant metabolism, and BMR variability (Ep 126)
Stronger By Science
Contains Naringenin, a flavone that inhibits the cyp1 A2 enzyme, thereby extending the half-life of caffeine in the body.