Branched-Chain Amino Acids
Supplement
A supplement example used to illustrate an experiment that has already been done with unexciting results, contrasting with betaine's current promising but inconclusive status.
Mentioned in 3 videos
Videos Mentioning Branched-Chain Amino Acids

Betaine, Sodium Bicarbonate, and Evaluating New Research as it Develops (Episode 45)
Stronger By Science
A supplement example used to illustrate an experiment that has already been done with unexciting results, contrasting with betaine's current promising but inconclusive status.

Outlive: The Science and Art of Longevity — Dr. Peter Attia
Tim Ferriss
Supplement that Dr. Attia used to drink during workouts, but now considers largely fallen out of favor due to issues with bioavailability and insufficient quantity.

Q&A: Carbs, Sodium, and Experimenting with Your Training (Episode 23)
Stronger By Science
A less optimal but still beneficial amino acid mixture for pre-workout, better than nothing if other options are not viable.